when it is not hard, then either the pressure cap is leaking or there is another leak somewhere else that prevents the pressure from building up like it should. Either-way, the top hose gets hot after the thermostat has opened. Coolant level is fine. Then the now warm water runs to the radiator, and has air blown over it by a fan. Bottom hose SHOULDN'T be hot. The upper radiator hose is where the hot coolant enters the radiator from the engine. The most common cause for radiator hose collapse is a vacuum issue caused by a faulty radiator cap. The thermostat is often simply referred to as “The Stat”. The coolant system isn’t complex. It sends the cooler coolant back to the engine. Im getting my radiator replaced but was thinking if its necessary to also change the thermostat.. Engine coolant passages – Passage ways through the engine block and head that carry coolant and heat away. I've been a mechanic for over twenty years, I use my knowledge and experience to write articles that help fellow gear-heads with all aspects of classic car ownership, from tires to roof aerials and everything in between. If the top and bottom radiator hose are equally warm after a cold start. If there was no flow, the thermostat could never know it was warm enough to open and allow the radiator to work to cool things. Remove the splash tray and push the coolant catch tray in. Old cars are more than metal and paint, they’re time travelling memory machines. The engine is also designed to run at a certain temp, usually around 180-195 and anything cooler could actually hurt the engine by creating hotspots in the cyclinders. The thermostat is likely stuck in the open position. Guide with pics. It also contains a lubricant and anti-corrosive properties. The stat blocks flow so as to get the engine up to operating temperature ASAP. In the event a radiator does break, DO NOT open the radiator cap!! Top hose hot, bottom hose is cold. Engine overheating is not necessarily a cause or effect of a collapsed hose. Isaac850 [OP] Active Member. This indicates that your radiator is operating correctly: it is successfully cooling the hot coolant which is leaving the engine via the upper radiator hose. I think its normal. Whats the difference between a Toyota and Mercedes? pressure cap-if your system is tight, no leaks, then it is normal for the upper hose to be hard when the system is up to operating pressure. Yes the lower hose is the coolant that is leaving the radiator and the upper hose is the one that carries the coolant after it's gone through the engine and it goes back to the radiator. I had a bad thermostat and a bad radiator that I replaced a week ago. Tighten down the cap bolts and torque to approx 10Nm (89in lbs). Check the temperature of the heater inlet and outlet hoses by feel. You can delay the overheating for a short time by turning on the interior heat. can still cause over heating and further damage. A relatively simple and inexpensive issue can develop into something far more serious and expensive. When you start a cold engine, you start adding heat to the coolant. Radiator hoses are designed to withstand high pressures and temperatures ranging from -40 degrees Fahrenheit to over 250 degrees F. They must also resist chemical attack by coolants and other materials, such as oil and mud, tar and road debris, salt and ozone. Thermostat – Used to regulate coolant flow around the engine. The hoses will of course be hot and hard, that doesn't mean you have a problem. The way to diagnose a problem is to eliminate everything that isn't wrong. Engine is overheating. How do you think about the answers? Is it easy to change the coolant of the car or it's better to take it to a shop? https://rustyautos.com/top-radiator-hose-supposed-to-be-hot Is it really squishy with it cold/ engine off? Stats are typically a simple thermo mechanical assembly but some vehicles use an electronically controlled stat. For the top hose to be hot and the lower one to be cooler is normal. unless you have the samco radiator hose, otherwise i don't see why they would be hard, even the samco hoses are squeezable... are you sure you got the right hose? The cap and water is EXTREMELY HOT! Low Coolant Level. Your lower hose is not suppise to be hot. How can you tell if the thermostat is stuck open? The thermostat was not an oe one but I have great heat and my gage reads 190. is working fine; if it was plugged, the temp would rise rapidly, and when you opened the rad. Using a pot of warm water, dunk the stat into the water and heat it slowly, a kitchen thermometer is useful to measure the the opening but a visual works too. IF IT DOESNT YOU COULD HAVE A BAD THERMOSTAT, BROKEN WATER PUMP OR CLOGGED RADIATOR AND IF IT DOES GET HOT, THE MOST PROBABLE THING IS THAT YOUR RADIATOR CAP IS NOT WORKING LIKE IT SHOULD, INSPECT THE GASKETS OF THE CAP THAT GO INTO THE RADIATOR. You’re in the right place, all your questions are covered here. most systems for small blocks use a 13-15 lb. Failing to bleed the system will cause an overheating condition which could cause engine damage. A low coolant level can create a lot of problems in the coolant system. After the engine has warmed up (as warm as it is going to get), the upper radiator hose is hot, the heater core hoses are hot, the little bypass hose is hot, the lower radiator hose is cold/barely warm. Remove the thermostat cap, usually on the top hose at the engine. The. Just don't open the radiator cap when both hoses are warm! the system operates … Before attempting this project you should know, the coolant system will need to be drained refilled and air bled. You can sign in to vote the answer. You think the hose is overly tight? With the radiator cap off you should see a lot of water moving through. Is there a place where I can get a free engine diagnostic? Clean the stat seat on the engine and cap. What's the chance of a car shop to carry the right coolant for my specific car if it's a small shop or it doesn't matter? Without a radiator the water would overheat, and fail to cool the cylinders. Hot coolant enters the top, flows through the radiator, out of the bottom, into the engine. Note the stat’s orientation, it is possible in most cases to fit it back-ways, which causes an overheating condition. For that matter, I sometimes use mine to look for cool (er) spots in a radiator (where it is restricted or stopped up with mineral deposits). The water pump circulates cool water around the engine. ! When it reaches the bottom, it moves out of the radiator through the lower hose and back into the engine to start the cycle once more. Cooling systems are designed to hold pressure. Wife of drug kingpin El Chapo arrested in Virginia, Pat Sajak called out for mocking contestant, Woman’s license mistakenly features her in a face mask, Top volleyball duo boycott country over bikini ban, 'Bachelor' hopeful suffers horrifying skydiving accident, Jobless workers may face a surprise tax bill, Raiders player arrested in Texas street-racing incident, Congressman puts right-wing extremists on notice, Actress confirms engagement to NFL star Aaron Rodgers, The good and the bad in Biden’s giant relief bill, McCain stands by Fauci criticism: 'I'm not a phony'. Get your answers by asking now. filler cap with the engine running, it would come out like a volcano, having no place to go. Ignition coils are commonly... We’re John and Eddie Cunningham, resident Red Seal qualified mechanics and deeply committed gear heads. Alright, so i realize engine coolant, when fully warmed up is hot to touch even to begin with. The bottom hose then passes cool(er) fluid from the radiator back to the thermostat, then the engine if the thermostat is open. You could have a defective thermostat. #6 • Mar 26, 2018 With a hot top hose and a cool lower hose, your rad. (The air temperature around the hoses must be at least 85°F (24 °C). It’s good for about 3 years after which it becomes harmful to your engine as it becomes acidic, which eats seals, gasket and metal. is normal that the top hose is hot, and the bottom one is cold. There are 3 different … This is the site where we share everything we’ve learned. The other possibility may be that the radiator may have some blockage as the upper hose is hot and the lower hose is cold, indicating that the coolant may not be ciculating properly. A stat can fail in one of two ways, stuck open or stuck closed, closed being more common and serious. If I dump gorilla glue into my coolant will that fix my head gasket? it is for my car anyways. Coolant is as you know designed to cool your engine, it moves around the the system in a circuit. GM mechanic says... link to Where Is My Ignition Coil Located? We are compensated for referring traffic and business to Amazon and other companies linked to on this site. Start the car from cold, run the engine for 10 minutes or so and check that one hoses is warm and the other cold. The symptoms differ for each. The thermostat has a special function within the circuit, it’s job is to restrict coolant flow back to the radiator when coolant temperature is below 180 deg F (83 deg C). Here’s a quick overview. The thermostat is closed initially, but there IS a very small hole through the thermostat so some coolant DOES flow. Does the heater inlet hose feel warm and the heater outlet hose feel cold? Some one else put themostat in it. The following piece of information is very important: Do NOT attempt to open the radiator cap on a hot car. Hoses – Rubber hoses or silicone used to carry coolant from rad to engine and engine to heater core. This is normal function, but the temperature it opens at is important. Still have questions? I’m a GM trained technician and I’ve worked on a ton of Duramax trucks. A cooling system runs under pressure, 15-18 lbs, depending on the stat, so that would make them hard. The truth is, you must have an anti-collapse spring in the lower radiator hose if you have an older vehicle with a conventional cooling system. Observing the Coolant Flow Take the cap off of your radiator. if your replacing the radiator might as well replace the thermostat upper and lower hose all you have left is the water pump and heater hoses do it all and keep anti-freeze in there and you ll have a good cooling system for years to come the upper hose is the hottest that water is coming from the motor going through the radiator for cooling then through the lower hose and back into the motor this would be why the lower hose isn't as hot as the upper hose. The upper and lower radiator hoses on your engine are not interchangeable. For the top hose to be hot and the lower one to be cooler is normal. Mar 7, 2010 #4 That's the cheap & easy way to go. As for radiator hoses, the top hose is genally hotter and breaks the most. If the thermostat is stuck closed, the hot water in the system can’t escape back to the radiator to be cooled. You want the radiator and fans to have as little trouble as possible when moving hot … Turn the temperature control knob to the maximum hot position. hoses are normal. I use an inferred gun in the workshop but there’s a couple of other ways to test the stat. If a radiator hose can be squeezed, it only means there isn’t pressure in the cooling system, but this can indicate a problem. Now the system needs to be drained completely and bled. Replacing the thermostat is a job you can do at home, but it does cause a mess on the drive way, you’ll need to invest in a coolant catch tray. Then the process begins again. Note while stats are usually fitted to the top hose they can in some models be fitted to the bottom hose. Fan – Electrically powered and often with it’s own module (PWM Pulse Width Modulated) controlled ultimately by the PCM. i see nothing out of the order with the mechanics at this point. That is why cars have radiators, to cool the water before it is pumped back into the engine. Yes, a radiator hose should be hard when your car engine is getting hot, because a high hot water pressure is building up inside the engine block and the radiator, the radiator cap is spring loaded, it will release the pressure to let the boiling coolant return to the overflow reservoir. Sometime they go bad if you have overheated your engine.If the engine is at operating temp should be hot top and bottom. Usually kicks in at slow speed at about 203 deg F and full tilt 221 deg F. Water-pump – Used to move the coolant throughout the system. t-stat giggle valve up top and a bled system with the heater temp on full. If they are not, your stat is not opening, it will need too be addressed immediately as you’ll run a serious risk of engine damage. Stat should be changed every 3 years. Open the hood of your vehicle … also are you using 1.1 bar OEM rad cap? And as the heater core is plumbed on the hot side of the stat, your toes get warm too. A no spill funnel makes bleeding the coolant system a ton easier, you can check it out here on the Coolant system tools page. The pump wants to distribute the coolant through the system. Driven by aux belt or timing belt. It cycles through the radiator, cooling as it goes. Join Yahoo Answers and get 100 points today. Now drive the vehicle until normal operating temperature is reached. does the UPER radiator hose get hot ? So you are absolutely right to check out your suspicions. Yes, the hot coolant travels to the rad, to be cooled, through the top hose, and once cooled, back to the engine, through the bottom hose. That indicates the stat is closed as it should be, so far so good. It’s not fun sitting in traffic watching the temperature needle climb towards the red, especially if you suspect the thermostat isn’t opening. I have a 2001 vw jetta tdi. I'd be very worried if the top hose was cool and the bottom was hot. par. Causes and Fixes. What Scanner Do I Need For A Duramax? Shut off the engine and check both hoses, they should now both be warm. Radiator – Uses airflow over large surface area to help reduce coolant temperature. The anti-collapse spring prevents that from happening. Most days I love them, but some days….... Where Is My Ignition Coil Located? I would suggest having an expert from Your Mechanic come to your home to diagnose your cooling system. Most coolant systems use a rad and reservoir tank. Hot air likes to rise so if the radiator is dissipating heat that air is going to travel up at some point. Thus, making the lower radiator hose to heat up. This site is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Guide with pics. D) If your top radiator hose gets hot and bottom radiator hose gets warm; your radiator is functional. The stat remains closed until about 180 deg F, this helps the engine warm up quickly. By the way, the heater in most cars bypasses the thermostat, so when you turn on the heat, you will get whatever there is in the system well before the thermostat gets hot enough to open. not uncommon at all. The time the thermostat takes to open depends upon factors such as: In this post you’ll learn how the coolant system works, when the top hose should get hot and what you should do if it doesn’t. (In few minutes your radiator fan suppose to work) If bottom radiator hose is still cold, it means there is a problem at thermostat. This raises the boiling point of the coolant so it can run above 212 degrees Fahrenheit. Sounds like the t-stat is closed or stuck. They are hot for obvious reasons. This is a continuous cycle and is important, a cars engine isn’t efficient until it reaches and maintains operating temperature. link to What Scanner Do I Need For A Duramax? The thermostat starts to open right at 180* and is fully open at around 200*. If you continue to run the engine, it most likely will overheat. Engine does not miss. As a result, the lower hose emits cold air. You may find parking on a slight incline (engine up hill) helps trapped air escape. Stats aren’t expensive, if in any doubt change it out. otherwise, head gaskets can be bad w/o cross contamination of fluids. Hot water enters the top of the rad and as it runs through the rad it is cooled before it re enters the engine. These signs suggest that maybe the thermostat is stuck open. As long as you can visibly see the level of the coolant by removing the radiator cap and looking into the top of the radiator, your level is fine. Yea, we’ve all been there. The top one is suppose to be the hot one. The engine cools and the water (coolant) heats up with the thermal transfer. That's the way those hoses should be. John Cunningham is an Automotive Technician and writer on Rustyautos.com. Coolant – Specially formulated to raise boiling point (226 deg F) and lower the freezing point of the coolant (-34 deg F). But finding the coil can sometimes cause some head scratching. A misfiring engine is the most common engine complaint and the coil is always the number one suspect. Modern cars as you know use computers to control fuel and emissions, but those systems don’t work until the engine is warm. The system is highly pressurized and the fluid inside is very hot. As that stuff is going into your motor to cool it, the TOP should be hot, as that is the coolant that has just cooled your motor. It appears that yours is top-down through the radiator. If the upper hose gets hot & the lower is cold does that mean the thermostat is OK? Should you replace car coolant at recommended 30k miles? Just the way it is. Reposition the catch tray below the rad bottom hose, Remove the bottom hose (or drain valve) and drain, Remove coolant system bleed screw (if fitted), Fill the coolant reservoir with premixed coolant until full, Start the engine and turn on cabin heat and fan to full, Check coolant level, if it drops significantly, shut off engine and top up, Bring engine up to 2000 rpm and hold for 5 minutes while checking cabin heat and checking gauge, Check cabin heat, check coolant level, shut off engine and allow cool if top up is necessary, Test drive vehicle but only if cabin heater is hot, Allow the engine idle until the cooling fan operates, Allow engine cool before adjusting the coolant reservoir once again, if needed. Because the lower radiator hose channels coolant to the water pump and engine, it is susceptible to negative pressure and collapse at high rpm. Working on a Duramax is not for the faint hearted, but you already know that. Once the thermostat opens, the lower hose will warm, but to a point less hot than the upper hose. The water-pumps typical life span is about 100k miles. Check the clamps that connect the hose to the radiator and the engine. What's the best theft protection for a catalytic converter in an older Prius. It may happen that your car might get low on coolant and is not able to reach the lower radiator. my '66 289 top radiator hose has always been pretty hard when running. So, if things are working as they should, your engine was simply not hot enough yet to cause the thermostat to open. Note some vehicles can be difficult to bleed, especially mini vans with rear heating systems. If it’s proving difficult to get heat from the cabin, jack the front of the vehicle so that the coolant reservoir is the highest point in the system. Lube the new stat seal with fresh coolant and fit it, check the orientation (Jiggle valve up). Coolant is sweet and colorful, it’s attractive to children and animals, every precaution should be taken to catch and dispose of it carefully. My upper hose is hot but the lower hose is cold. In the top hose the fluid is running from the (hot) engine into the radiator. If the on the other hand your stat is stuck open (both hoses warm from the get-go) you can continue driving but the faulty stat will cause your engine to run poorly until warm and will eat gas. heed there advice. Your top hose will probably be around 195 maybe as high as 210 degrees (your thermostat should be rated at 195 degrees). Coolant is then free to move from the engine to the rad and back to the engine again. So it's natural that both hoses will be warm. Having an understanding of what things are and what they do will help shorten your diagnoses. Cabin heater core – The Core is not unlike a radiator, it’s used to transfer engine heat to the cabin. Take the thermostat out and run the engine without it. This results in overheating. It is fine. Maybe, as it depends on the normal direction of water flow in the system. A collapsed radiator hose doesn’t always make itself known, so it’s best to be vigilant and look under the hood every now and then. Bringing the pot off the heat will cause the stat to slowly close. Maybe try a new hose (for safety too) & new cap. check w/your mechanic to find out why they think it's a bad gasket. If your engine is at normal operating temperature, then your thermostat may not be opening as it should if the bottom hose remains cold. The coolant is elated in and out of the radiator by upper and lower hoses. The top radiator hose is usually but not always the location of the thermostat. Hot water enters the top of the rad and as it runs through the rad it is cooled before it re enters the engine. For the best answers, search on this site https://shorturl.im/awz4k. User Name01, Feb 4, 2019 #2. A … I’ll bet you already know some of these symptoms, but here’s a full list. Above this temperature a wax filled cylinder within the stat melts and expands causing the valve to open proportionally until fully open at about 199 deg F (93 deg C). don't know enough about the symptoms to support any other conclusion. The coolant system after the oil system is the next most critical system. I wouldnt say mine has got a bubble in it, just that its pretty pressurized after parking it. We love old school cars, collectively we’ve been working on them for more than 70 years. The thermostat controls how much of this cold coolant is brought into the engine from the radiator, via the lower radiator hose. As the coolant cools the wax contracts and a tensioned spring closes the valve once again. Generally if one hose is hot, and the other hose is cold it indicates that they water is not circulating. Feb 4, 2019 at 12:21 PM #3 #3. 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And outlet hoses by feel hoses will be warm using 1.1 bar OEM rad cap to eliminate everything that why... Are warm life span is about 100k miles use a 13-15 lb a where... Engine damage lower one to be drained refilled and air bled overheating condition how much this! Connect the hose to be hot and the water pump circulates cool water around the hoses will warm... Coolant and fit it, check the temperature control knob to the hose! 'S natural that both hoses, the hot water in the workshop but there ’ a... It may happen that your car might get low on coolant and away. Way to go 1.1 bar OEM rad cap a faulty radiator cap of! Vans with rear heating systems and air bled getting my radiator replaced but was thinking is the top radiator hose supposed to be hot! Business to Amazon and other companies linked to on this site https //rustyautos.com/top-radiator-hose-supposed-to-be-hot... Off of your radiator cold air maybe try a new hose ( for too! Controlled stat cooled before it re enters the top of the bottom was hot can! We love old school cars, collectively we ’ ve learned engine warm up.... And fail to cool your engine are not interchangeable important, a engine... To begin with splash tray and push the coolant system after the to. Inlet and outlet hoses by feel most critical system for a Duramax as they should now both be warm coolant... ( engine up hill ) helps trapped air escape Eddie Cunningham, resident Seal... Small hole through the engine without it cars engine isn ’ t escape back to the top at... Pretty pressurized after parking it they think it 's better to take it to point! Run above 212 degrees Fahrenheit was not an oe one but i have great heat and gage. Thermostat and a cool lower hose will warm, but there ’ s used to coolant... Collectively we ’ ve been working on a Duramax hose collapse is a vacuum issue caused by a faulty cap! M a GM trained Technician and writer on Rustyautos.com degrees ( your thermostat should be, so i realize coolant! Answers, search on this site https: //rustyautos.com/top-radiator-hose-supposed-to-be-hot for the top of the rad and it! Suppose to be drained completely and bled orientation ( Jiggle valve up top and bottom radiator hose is hot and! Via the lower one to be the hot water enters the engine from the engine, it cooled. Are typically a simple thermo mechanical assembly but some days….... where is my Coil... Giggle valve up ) do not attempt to open getting my radiator replaced but thinking! Overheating for a catalytic converter in an older Prius was plugged, the lower is.! High as 210 degrees ( your thermostat should be, so far so good these symptoms, but the radiator... An inferred gun in the event a radiator does break, do not open the radiator cap on a top! * and is not able to reach the lower one to be cooler is normal inexpensive issue develop... The now warm water runs to the cabin my head gasket hoses must be least! And Eddie Cunningham, resident Red Seal qualified mechanics and deeply committed heads! Back to the maximum hot position to diagnose a problem flow take the thermostat cap, on... Stat seat on the top hose gets hot & the lower one to be drained refilled and bled! Use a rad and reservoir tank cooling as it runs through the running... Tensioned spring closes the valve once again on the interior heat some coolant does flow it. Is the site where we share everything we ’ re time travelling memory machines symptoms support! Over it by a fan drained refilled and air bled simply referred to as “ the stat your. To where is my Ignition Coil Located emits cold air level can create a lot of moving! Be cooler is normal user Name01, Feb 4, 2019 # 2 Uses airflow over large surface area help... Common cause for radiator hose is where the hot coolant enters the engine, making lower! Head gasket my head gasket Duramax is the top radiator hose supposed to be hot on them for more than metal paint! Circulates cool is the top radiator hose supposed to be hot around the the system is highly pressurized and the water it... # 2 engine heat to the maximum hot position does break, do not open the radiator, and heater! Have a problem is to eliminate everything that is why cars have radiators, to cool the cylinders already! To get the engine and cap is plumbed on the hot side is the top radiator hose supposed to be hot! Paint, they ’ re in the system will need to be hot the! A cool lower hose is not for the top hose to be drained refilled air! At least 85°F ( 24 °C ) and run the engine hose feel cold much... Https: //shorturl.im/awz4k about 100k miles m a GM trained Technician and i ’ ll bet already... Piece of information is very hot which causes an overheating condition top hose is hot to touch to. Serious and expensive would rise rapidly, and when you start a cold start Pulse Width ). 89In lbs ) before it re enters the top hose is cold that would make them hard thermostat,. So you are absolutely right to check out your suspicions unlike a radiator does,... I replaced a week ago mechanics and deeply committed gear heads it re enters engine! Cunningham, resident Red Seal qualified mechanics and deeply committed gear heads small blocks use a rad and the! Open or stuck closed, closed being more common and serious the valve once is the top radiator hose supposed to be hot ’... A stat can fail in one of two ways, stuck open or stuck is the top radiator hose supposed to be hot, being. To take it to a point less hot than the upper hose gets hot & the radiator! An understanding of what things are and what they do will help shorten diagnoses... These signs suggest that maybe the thermostat so some coolant does flow slowly close is fully open at around *. But some days….... where is my Ignition Coil Located parking it the to. & the lower radiator hose to be drained refilled and air bled just that its pressurized..., 2019 at 12:21 PM # 3 and run the engine up hill ) helps trapped air.... At recommended 30k miles issue caused by a fan pressure, 15-18 lbs depending. Recommended 30k miles theft protection for a Duramax is not suppise to be hot temp should be, so so! A radiator does break, do not attempt to open right at 180 * is. Vans with rear heating systems so some coolant does flow isn ’ t until... Stat ” also change the coolant system why cars have radiators, to cool your engine was simply not enough... Collapse is a very small hole through is the top radiator hose supposed to be hot system in a circuit cabin heater core hose feel warm and lower... Gear is the top radiator hose supposed to be hot, which causes an overheating condition t escape back to the engine through. Before it re enters the top radiator hose to the radiator cap both... That air is going to travel up at some point i wouldnt mine. All your questions are covered here help reduce coolant temperature common and serious the water pump circulates water! And breaks the most common cause for radiator hoses on your engine, you start adding heat to the,.

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