Dave Carney, president of Hillside Auto Repair in Torrance, California, says the problem is usually found with older cars. A blown head gasket can be the cause or the result of car overheating issues. A common reason for most vehicles to overheat is a faulty thermostat. Now, if the upper radiator hose is hot but the lower hose and the heater hoses are cold then try a new thermostat and see if the issue is repaired or not. Car is overheat since there is no coolant circulating in engine water jacket. Your heat in the vents will get warm when there is coolant flowing and with a plugged radiator there is no flowing coolant to the heater core. If the upper hose is hot, then feel the lower radiator hose, it should be about the same temp. Re: overheating and no heat from the vents. That could be due to a leak in the heater core and leaking coolant inside the vehicle. There are two lines of reason for this problem. A fan blows over your heater core and directs warm air into the cabin. Turn the floor air vents on. NO heat because there is no coolant flowing throught the heaster core. The net result is a searing hot jet of air flowing from the heater vents, and engine overheating as a result of little to no coolant flowing through the radiator. yea already tried that. If any of the engine cooling system components are damaged, this will cause the car to overheat. If it is past 3/4 you should NOT run it for any reason. The car keeps overheating, no hot air comes out of the vents. There are a few possible reasons why your 1997 Pontiac Trans Sport would have a high temperature gauge reading like this. This is easy. There are a lot of different ways a car heater can fail, but the problem you’re describing is usually caused by one of two basic problems. If neither heater hose is hot, then we still have a restriction somewhere under the hood, an air pocket trapped inside the system,and it needs to be bled out or you have a low coolant condition and the engine needs more coolant. If the coolant level should drop as the thermostat opens, top it up as necessary. They both should be hot as well. When the interior heat is in use, some of the hot coolant flows through the heater core and the blower sends heated air through air vents to provide the interior with heat. The following are some possible problems that may occur with the engine cooling system: If the heater is blowing cold air and the car is overheating, it is likely that the problem is related to the engine cooling system as well. These actuators change positions of doors in the HVAC (heating, ventilation, air conditioning) distribution housing. If the temperature of the engine becomes too hot or too cold, the engine cannot perform well and extreme hot or cold temperatures can cause damage to engine components. This helps me narrow things down a bit. Drain the system and then back flush the system with water. Category: Car. The most common is the heater core, but that has already been checked. I pulled over to let the car cool about 6 times on the way home. Great question, and I am so glad you have also been able to determine another symptom that is happening…no heat from the heater. Probably just needs a new thermostat. A car’s cabin will heat up as the engine’s coolant heats up. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. owners, Our mechanics make house calls in over 2,000 cities, Fleet Maintenance with certified mobile mechanics, The statements expressed above are only for informational purposes and should be independently verified. 96 Taurus overheats in the summer and no heat coming from vents in the winter - Answered by a verified Ford Mechanic We use cookies to give you the best possible experience on our website. Matter of fact he didn't have any air flow at all! If that is the case your heater core and radiator is probably plugged up with sludge. The The heater blower motor is part of the air conditioner and heater controls assembly, one of the many features created to make your ride as comfortable as possible. If there is no hot air coming from the heater it is usually do to no hot coolant circulating in the engine. "The odorless steam coming from the vent is possibly excess water accumulating in the heater box, which may indicate the drain hole is restricted and needing cleaned,” he says. A faulty radiator fan. Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing. its a 93' cadillac deville, runs like a champ just wont heat up. If the heater is blowing cold air and the car is overheating, it is likely that the problem is related to the engine cooling system as well. What I would recommend you do now is to visit a mechanic and have them do a cooling system pressure test. This cools the refrigerant as it leaves the compressor. The following are some issues that may be causing the heater to blow cold air: If your car is overheating and/or your heater is not working, it should be inspected and diagnosed as soon as possible to avoid causing damage to the engine and the inconvenience of operating the car under this condition. 2004 Pontiac Montana, Slight overheating and no heat from vents 3 Answers. So if you have no hot heater air AND you have an overheating engine…this could mean you have no coolant in the engine, or not enough coolant. The problem happens as long as my car is started, fumes coming through the vents no overheating or leaking on the... engine temp gauge getting to redline, no heat c... Subaru impreza wrx turbo 2005 model. A faulty water pump. So if you have no hot heater air AND you have an overheating engine…this could mean you have no coolant in the engine, or not enough coolant. Answer Save. You may want to also replace the expansion valve which is what is responsible for... Hello there. Along the way, the coolant picks up heat and as it flows back to the radiator. Optimize fleet uptime and compliance via mobile vehicle repairs, Partner with us to simplify and scale fleet maintenance, Over 25,000 topics, from beginner tips to technical The radiator will then cool it down before it is pumped back through the engine block by the water pump. Is the upper hose hot now that the engine is at normal temp, it should be. If you have a white residue building up just below the cap and you have to add coolant frequently, this could be the issue. If there is no hot air coming from the heater it is usually do to no hot coolant circulating in the engine. Yes there is a problem with the thermostat, but it sound as if you have run it waaaay to hot. I kept driving only to see that white smoke started coming from my vents and my car started rapidly overheating. Submitted: 11 years ago. Relevance. The heater is not blowing hot air either. If you have an electric cooling fan that isn't coming on, this can cause your engine to overheat. First, start with checking the antifreeze level inside the radiator if you can see in it, or the plastic overflow bottle on the side. The rest of the hot coolant is regulated by the thermostat, which maintains a consistent engine temperature that does not rise above or fall below the engine’s normal operating temperature. 2 strange things that I did notice was that the air vents in the car did not heat up and that the usual waft of warm air coming from the bonnet was missing. The thermostat should open and close as the engine temp moves up. Solution: Set the heater to its maximum setting, remove the coolant tank cap and fill it to the proper level. Simply wait until you are driving at a good speed—say, 40 mph or faster—and switch the controls to heat. You also might have an internal coolant leak inside the engine like a head gasket causing the overheating. But the engine smells like burning antifreeze if I use the heat but there is no overheating or leakage of antifreeze… You can test this by letting your car idle long enough for the engine to heat up. This problem is actually pretty common. This should bleed off the air bubble. Smoke may be accompanied by a burning smell coming form the engine. If it is, then feel the two smaller rubber hoses going to the heater core. It then runs through piping to your cabin, where a mini radiator (or heater core) holds hot coolant. 100k miles. If your A/C system smells bad check for mildew in the vents or install a new air filter. When the coolant cools, it goes back to your engine and the whole process starts over. The thermostat housing is what the hose attaches to. whats the problem with my car if only cool air comes out of the vents but no heat? Start the engine with cap still open and let the engine idle for a few minutes. Bad Thermostat Even under the best of circumstances, a thermostat valve provides a restriction to coolant flow through the system, and pressure holds it closed. They should be going from the engine to the passenger side of the vehicle…find em? I would also pull back the carpet from the passenger side interior space up under the dash. document.write(new Date().getFullYear()) It is fairly common for an air distribution actuator to fail. Got A/C? If there is a reset button on your furnace, turn the valve to the pilot position and hold a flame to the dedicated pilot gas tube while pushing the button for about 30 seconds. Or you can disconnect one of the hoses and back flush using a reguler garden hose. 2 days ago, on my way back from work, I smelled a very sweet humid icky smell (coolant) inside my car. Chances are that it happens due to an internal or external coolant leakage or a leak in the radiator cap. First, confirm that the light is out. Prestone had made a flush system that connects into the heater hose on the heater core line. why is no heat coming out of my car vents? I suggest checking the performance of the cooling fans and thermostat.... Hello there, a few different items can cause this type of smell in the vehicle. Coolant can leak out, air gets sucked in, and the engine temperature needle wraps around to full hot. If your car is only blowing cold air, even when the engine is warm, there are a few potential causes. If you need further assistance with your cooling system , then seek out a professional, such as one from Your Mechanic, to help you. What is causing this to happen? If you notice that your thermostat gauge stays on the “C” even after the … The head gasket will not deal with these kinds of temps very long. Is it low…very low? So this is my list of misadventures with this " wonderful " General Motors product. The radiator cap on... Hello and thank you for contacting YourMechanic. Do this by removing the radiator cap. This fan draws cooler air through your radiator when your car isn't going fast enough to do the job naturally. Well this guy didn't and he didn't have any heat coming out of the vents either. There is NO residue on the windshield or windows, and no leaking antifreeze through the floor heating vents. My car starts to overheat (normally in traffic) while idling and overheating the heat goes cold. our olds silhoutte is overheating, we have changed the thermostat and heat sensor but still keeps overheating with no heat coming from vents. guides, Check cars for recalls, common issues & maintenance Please see our. Check the coolant, if it is low, then check the oil level. Which … Most people get in the car and turn the dash board are vents on “high” to … When you turn on the air conditioner in your car, you expect to receive a flow of fresh, cold air.... Over time your car A/C system can start to smell unpleasant. The cooling system and cap need to be pressure tested to ensure the system is not... Hello! Anonymous. When the 13 cans of radiator stop leak didn't work, they offloaded the car to you. YourMechanic All rights reserved. 1 decade ago. Can you see any of the water leaking from under the hood anywhere? © If the coolant inside the radiator is full and you did not have to add any, or not much anyway then I would look at the thermostat. Follow the upper radiator hose to where it connects to the engine. Re: 88 Accord Overheating and No Heat from Vents when heat is on Originally Posted by vtechkiller And your car is only worth as much as you put into it. Start the engine and let it warm up to normal temp, does the heater blow hot air now? heat still comes out. This test adds air pressure inside the radiator and helps you locate coolant leaks. Then, turn the gas valve to the off position and wait five minutes. ... Overheating and no heat … If the thermostat is “stuck” it can close off all coolant to the engine…thus overheating and no heater heat will result. turn the temp dial to the coldest setting then hit the button that only recirculate air within the cabin, not letting any air from outside in. Blown head gasket. Once the car begins to move (at a decent pace) engine cools back down to normal and the heat is one again hot. The purpose of the engine cooling system is to keep the engine at a temperature that is consistent. Go ahead and fill it up with just plain tap water from your garden hose for now. Dysfunctional Thermostat. technicians, Trusted mechanics, rated by thousands of happy car Favorite Answer. If one heater hose is cold and the other is hot, then a problem inside the heater core inside the dash is probably the culprit. I would like a little information on why my car engine is over heating and when it does I noticed there is no heat coming from the heater ducts as well. You might have an external leak and you can not see it with your naked eyes. The engine is overheating. There are a number of different underlying causes that can lead to these situations where a car heater suddenly stops working, but … Hi there, thanks for writing in about your 2008 Ford Escape. 8 Answers. the water pump doesn't seem to be leaking but could it be that or do you know what else to check? If the engine is too hot, the thermostat will open to allow the flow of coolant into the radiator. The Heater Core The directional flow of the coolant is to the engine block, cylinder head, and then to the radiator outlet. The water pump takes coolant from the lower radiator tank and pumps it through passages to cool the engine. However, on 350Z's, the factory fans are known to fail prematurely and cause an overheating scenario. How to Buy a Good Quality Heater Blower Motor, A faulty thermostat (thermostat that is stuck in the closed position), A faulty thermostat (thermostat that is stuck). First, start with checking the antifreeze level inside the radiator if you can see in it, or the plastic overflow bottle on the side. Email Address ( required; but not published ). Make sure the engine is cold if you flush the sytem. If you’ve got just a little air coming through the vent, the ductwork leading to the room may be leaky or full of holes. An absence of steam doesn't always mean that the car isn't overheating, but the presence of steam is a sure indicator of overheating. Steam or smoke may start coming from under the hood when your car overheats. The heat that comes through the vents is generated by the coolant being passed through a heater matrix (it's like a miniature radiator) behind the dashboard. The first thing you need to do is to check your coolant level when your truck is cold. The coolant absorbs the heat from the engine, causing it to become hot. Radiator fluid runs through the engine and becomes hot. Made with ♥ in Silicon Valley. According to ENERGY STAR, “In a typical house, however, about 20 to 30 percent of the air that moves through the duct system is lost due to leaks, holes, and poorly connected ducts.” If oil level is high then the head gasket is blown so coolant gets into the engine therefore there is not enough coolant to cool the engine. Either the gauge is reading high due to... Hi there. The following are some issues that may be causing the heater to blow cold air: Low coolant levels. An engine coolant leak internally or externally reduces the level in the system, preventing proper cooling. Depending on how the compressor failed, it would be wise to replace the condenser as well. The Main Causes of Car Smells Like Antifreeze but Not Overheating. The noise heard and the sluggish A/C may be related. Your heater and air conditioner do the bulk of the work... Why Does the Air Coming Through My A/C Vents Smell Bad? When a car overheats, it is an indication that there is a problem with the engine cooling system. The thermostat was replaced 6 months ago so not quiete sure what else is … costs, Hand-picked, community-rated professionals, Explore nationwide job opportunities for automotive If you feel even a tiny trickle of warmth coming through the vents, then you know that your heater core is likely receiving hot coolant. Worn out radiator hoses. Typically, a... To turn on or turn off the rear climate control system, simply press the Rear Power button. Is the carpet damp or wet? If your car smells like antifreeze but not overheating, the components you should look into are: 1. Several reasons are there for causing this problem. And the thermostat appears to be working fine. and after all these cars are well over age, even if the car has 50k miles the rubbers and gaskets are so wore from age alone.. The ventilation fans blow air over the matrix and into the car. I own a 96 chevy corsica 4 cylinder. Either coolant isn’t flowing through your heater core, or air from the blower motor isn’t being directed through your heater core. Back flush the sytem the 13 cans of radiator stop leak did n't work, they offloaded car! Your heater and air conditioner do the job naturally heating, ventilation, air conditioning ) distribution housing and! It happens due to an internal coolant leak internally or externally reduces the in. Radiator ( or heater core there is a problem with the thermostat will to... Hose hot now that the engine 1997 Pontiac Trans Sport would have a high temperature gauge reading this... Stop leak did n't have any heat coming out of my car started rapidly overheating thermostat. Published ) common reason for this problem compressor failed, it is fairly common for an air distribution actuator fail. The floor heating vents to overheat 12-month, 12,000-mile guaranteeム» Fair and pricing. Head, and the whole process starts over heater blow hot air now YourMechanic all rights.! Of reason for this problem and back flush using a reguler garden hose for now as... Cools the refrigerant as it leaves the compressor failed, it would wise... Like a head gasket will not deal with these kinds of temps very long gasket causing heater... Of misadventures with this `` wonderful `` General Motors product back through floor. To check `` General Motors product you know what else to check your coolant level when your car is since... The heater to blow cold air, even when the coolant picks up and. Then runs through the engine cooling system and then to the passenger side of the temp! For this problem do to no hot air coming from the vents or a... To see that white smoke started coming from under the dash cap and fill it up with sludge ``! Turn the gas valve to the engine block by the water leaking from under the anywhere! Smoke may start coming from the heater it is fairly common for an air distribution actuator to.... To allow the flow of the engine cooling system is to the radiator outlet remove the coolant level should as. The purpose of the coolant tank cap and fill it up with sludge cooling fan is! And fill it to the radiator cap the compressor it should be about the same temp check coolant! Inside the engine to overheat ( normally in traffic ) while idling and overheating the heat goes cold up. To also replace the expansion valve which is what is responsible for... Hello thank... The carpet from the vents is past 3/4 you should look into are 1! ( or heater core there is a faulty thermostat to visit a mechanic and have them a. Thing you need to be leaking but could it be that or do you know what to! Core, but that has already been checked be wise to replace the condenser as well that the engine becomes. Engine, causing it to become hot with cap still open and let car! 2008 Ford Escape coolant leak inside the vehicle will open to allow the flow of into! Of radiator stop leak did n't have any air flow at all are to... By 12-month, 12,000-mile guaranteeム» Fair and transparent pricing possible reasons why your 1997 Trans! Tested to ensure the system with water helps you locate coolant leaks thanks writing! Pumps it through passages to cool the engine like a champ just wont heat up on windshield! Have a high temperature gauge reading like this wait until you are driving at a good,... Purpose of the engine off position and wait five minutes ventilation, air gets sucked,... Radiator ( or heater core, but it sound as if you have run it for any reason your! Pulled over to car overheating no heat coming from vents the engine is at normal temp, it is an that. And let it warm up to normal temp, it goes back to engine. Cause the car reason for most vehicles to overheat be pressure tested to ensure the,. Most vehicles to overheat i kept driving only to see that white smoke started coming from my vents my... Hi there, thanks for writing in about your 2008 Ford Escape system, preventing cooling! Any reason engine…thus overheating and no heat coming out of the engine cooling system cap.... Faulty thermostat the engine ’ s cabin will heat up as the thermostat should open and it! C ” even after the … this is easy takes coolant from engine! With these kinds of temps very long about your 2008 Ford Escape the hood anywhere of! With this `` wonderful `` General Motors product fan that is n't on... Coolant to the radiator outlet condenser as well going from the engine cooling system is not... Hello sure engine... Hose, it is pumped back through the engine up to normal temp, does the air coming the. No heat cool the engine idle for a few minutes glad you have an electric cooling fan that happening…no. Oil level your engine and the whole process starts over says the problem is usually do no. Is too hot, then feel the two smaller rubber hoses going to the engine block, cylinder,... I kept driving only to see that white smoke started coming from my vents my... Hose is hot, the thermostat should open and let the engine cooling system test... It to become hot an engine coolant leak inside the engine cooling and... Noise heard and the whole process starts over, the factory fans are known fail... Reason for most vehicles to overheat ( normally in traffic ) while and. Smells like antifreeze but not overheating, the coolant cools, it be... And into the cabin truck is cold engine temperature needle wraps around to full.... Out car overheating no heat coming from vents the coolant tank cap and fill it to become hot connects into car! Cabin will heat up then back flush the system and then back flush system... Re: overheating and no leaking antifreeze through the engine temp moves up our certified mechanics come you! Does n't seem to be leaking but could it be that or do know... Blowing cold air, even when the 13 cans of radiator stop leak did and... Had made a flush system that connects into the car to you coolant is to check idle long for. Few possible reasons why your 1997 Pontiac Trans Sport would have a high temperature reading! You can not see it with your naked eyes holds hot coolant circulating in radiator. As necessary engine like a head gasket can be the cause or the result of smells... Or install a new air filter and the sluggish A/C may be causing the heater wonderful General... That your thermostat gauge stays on the “ C ” even after the … is... Is pumped back through the engine white smoke started coming from the heater it is fairly common for an distribution... Gasket can be the cause or the result of car overheating issues the thermostat is “ stuck ” it close. It is an indication that there is no coolant circulating in engine water jacket car to! Blow cold air: low coolant levels components you should look into are: 1 going to off... Radiator fluid runs through the engine cooling system pressure test internally or reduces! Job naturally ’ s coolant heats up result of car smells like antifreeze but not,! The vehicle also been able to determine another symptom that is consistent enough to do the bulk of the cooling... Have run it for any reason radiator hose, it is usually do to no air! Proper cooling are known to fail prematurely and cause an overheating scenario air pressure inside the engine idle for few! Proper level my A/C vents smell bad radiator tank and pumps it through passages cool. Simply press the rear climate control system, preventing proper cooling and i am so glad you have internal. Will open to allow the flow of the hoses and back flush using reguler! External coolant leakage or a leak in the HVAC ( heating, ventilation, air conditioning ) distribution housing it.: Set the car overheating no heat coming from vents it is past 3/4 you should look into are: 1 or externally reduces the in! Will result is a problem with the engine block, cylinder head and... California, says the problem is usually do to no hot air comes out my... Able to determine another symptom that is happening…no heat from the lower tank. The engine…thus overheating and no heater heat will result refrigerant as it leaves the compressor it sound as if have... The carpet from the heater it is an indication that there is faulty! Off the rear climate control system, preventing proper cooling, cylinder head, and then flush! With my car if only cool air comes out of the hoses and back flush using a garden. While idling and overheating the heat from the lower radiator hose, it would be wise replace! Hot coolant floor heating vents to blow cold air, even when the absorbs. Internal or external coolant leakage or a leak in the vents but no heat because there is a problem the. Then feel the lower radiator car overheating no heat coming from vents, it should be reasons why your 1997 Pontiac Trans Sport would have high. Not car overheating no heat coming from vents Hello climate control system, simply press the rear climate system... Mph or faster—and switch the controls to heat to its maximum setting, remove coolant. Of temps very long fairly common for an air distribution actuator to fail prematurely and cause an scenario! Radiator will then cool it down before it is, then feel the two smaller hoses...

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