car overheating no heat coming from vents

The thermostat housing is what the hose attaches to. If you need further assistance with your cooling system , then seek out a professional, such as one from Your Mechanic, to help you. I would also pull back the carpet from the passenger side interior space up under the dash. Follow the upper radiator hose to where it connects to the engine. If you have an electric cooling fan that isn't coming on, this can cause your engine to overheat. Anonymous. Simply wait until you are driving at a good speed—say, 40 mph or faster—and switch the controls to heat. The purpose of the engine cooling system is to keep the engine at a temperature that is consistent. 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. This is easy. Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing. If it is, then feel the two smaller rubber hoses going to the heater core. This should bleed off the air bubble. 1 decade ago. The noise heard and the sluggish A/C may be related. A car’s cabin will heat up as the engine’s coolant heats up. Either coolant isn’t flowing through your heater core, or air from the blower motor isn’t being directed through your heater core. Depending on how the compressor failed, it would be wise to replace the condenser as well. They both should be hot as well. There are two lines of reason for this problem. This fan draws cooler air through your radiator when your car isn't going fast enough to do the job naturally. A common reason for most vehicles to overheat is a faulty thermostat. I kept driving only to see that white smoke started coming from my vents and my car started rapidly overheating. 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 radiator cap on... Hello and thank you for contacting YourMechanic. If that is the case your heater core and radiator is probably plugged up with sludge. ... Overheating and no heat … If your car smells like antifreeze but not overheating, the components you should look into are: 1. If there is no hot air coming from the heater it is usually do to no hot coolant circulating in the engine. So this is my list of misadventures with this " wonderful " General Motors product. "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. Answer Save. 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. 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. If the thermostat is “stuck” it can close off all coolant to the engine…thus overheating and no heater heat will result. If it is past 3/4 you should NOT run it for any reason. The ventilation fans blow air over the matrix and into the car. Is it low…very low? 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. There is NO residue on the windshield or windows, and no leaking antifreeze through the floor heating vents. 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. When a car overheats, it is an indication that there is a problem with the engine cooling system. Email Address ( required; but not published ). Coolant can leak out, air gets sucked in, and the engine temperature needle wraps around to full hot. Got A/C? Great question, and I am so glad you have also been able to determine another symptom that is happening…no heat from the heater. Please see our. The radiator will then cool it down before it is pumped back through the engine block by the water pump. 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 engine is overheating. But the engine smells like burning antifreeze if I use the heat but there is no overheating or leakage of antifreeze… Chances are that it happens due to an internal or external coolant leakage or a leak in the radiator cap. 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. Most people get in the car and turn the dash board are vents on “high” to … If your A/C system smells bad check for mildew in the vents or install a new air filter. its a 93' cadillac deville, runs like a champ just wont heat up. 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. Smoke may be accompanied by a burning smell coming form the engine. the water pump doesn't seem to be leaking but could it be that or do you know what else to check? Probably just needs a new thermostat. Your heater and air conditioner do the bulk of the work... Why Does the Air Coming Through My A/C Vents Smell Bad? whats the problem with my car if only cool air comes out of the vents but no heat? The thermostat was replaced 6 months ago so not quiete sure what else is … Dave Carney, president of Hillside Auto Repair in Torrance, California, says the problem is usually found with older cars. Prestone had made a flush system that connects into the heater hose on the heater core line. The Main Causes of Car Smells Like Antifreeze but Not Overheating. An engine coolant leak internally or externally reduces the level in the system, preventing proper cooling. You might have an external leak and you can not see it with your naked eyes. You may want to also replace the expansion valve which is what is responsible for... Hello there. why is no heat coming out of my car vents? You also might have an internal coolant leak inside the engine like a head gasket causing the overheating. Dysfunctional Thermostat. 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.” NO heat because there is no coolant flowing throught the heaster core. Hi there, thanks for writing in about your 2008 Ford Escape. Which … 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. First, confirm that the light is out. 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. 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. costs, Hand-picked, community-rated professionals, Explore nationwide job opportunities for automotive Made with ♥ in Silicon Valley. 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. The coolant absorbs the heat from the engine, causing it to become hot. You can test this by letting your car idle long enough for the engine to heat up. Is the carpet damp or wet? First, start with checking the antifreeze level inside the radiator if you can see in it, or the plastic overflow bottle on the side. Either the gauge is reading high due to... Hi there. Worn out radiator hoses. A fan blows over your heater core and directs warm air into the cabin. Go ahead and fill it up with just plain tap water from your garden hose for now. Well this guy didn't and he didn't have any heat coming out of the vents either. However, on 350Z's, the factory fans are known to fail prematurely and cause an overheating scenario. If there is no hot air coming from the heater it is usually do to no hot coolant circulating in the engine. Matter of fact he didn't have any air flow at all! What is causing this to happen? 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. This cools the refrigerant as it leaves the compressor. A blown head gasket can be the cause or the result of car overheating issues. Is the upper hose hot now that the engine is at normal temp, it should be. 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. And the thermostat appears to be working fine. 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. 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. 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. Once the car begins to move (at a decent pace) engine cools back down to normal and the heat is one again hot. 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. Submitted: 11 years ago. The heater is not blowing hot air either. 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. Category: Car. heat still comes out. 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. technicians, Trusted mechanics, rated by thousands of happy car Car is overheat since there is no coolant circulating in engine water jacket. It then runs through piping to your cabin, where a mini radiator (or heater core) holds hot coolant. A faulty radiator fan. This test adds air pressure inside the radiator and helps you locate coolant leaks. 2004 Pontiac Montana, Slight overheating and no heat from vents 3 Answers. Start the engine and let it warm up to normal temp, does the heater blow hot air now? The following are some issues that may be causing the heater to blow cold air: Low coolant levels. It is fairly common for an air distribution actuator to fail. If any of the engine cooling system components are damaged, this will cause the car to overheat. The most common is the heater core, but that has already been checked. What I would recommend you do now is to visit a mechanic and have them do a cooling system pressure test. 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. If you have a white residue building up just below the cap and you have to add coolant frequently, this could be the issue. 100k miles. our olds silhoutte is overheating, we have changed the thermostat and heat sensor but still keeps overheating with no heat coming from vents. 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. If you notice that your thermostat gauge stays on the “C” even after the … Relevance. YourMechanic All rights reserved. There are a number of different underlying causes that can lead to these situations where a car heater suddenly stops working, but … 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 your car is only blowing cold air, even when the engine is warm, there are a few potential causes. The thermostat should open and close as the engine temp moves up. Or you can disconnect one of the hoses and back flush using a reguler garden hose. Make sure the engine is cold if you flush the sytem. Check the coolant, if it is low, then check the oil level. 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. A faulty water pump. When the 13 cans of radiator stop leak didn't work, they offloaded the car to you. That could be due to a leak in the heater core and leaking coolant inside the vehicle. I pulled over to let the car cool about 6 times on the way home. The cooling system and cap need to be pressure tested to ensure the system is not... Hello! Solution: Set the heater to its maximum setting, remove the coolant tank cap and fill it to the proper level. 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 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 days ago, on my way back from work, I smelled a very sweet humid icky smell (coolant) inside my car. guides, Check cars for recalls, common issues & maintenance Start the engine with cap still open and let the engine idle for a few minutes. These actuators change positions of doors in the HVAC (heating, ventilation, air conditioning) distribution housing. 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. Radiator fluid runs through the engine and becomes hot. If the upper hose is hot, then feel the lower radiator hose, it should be about the same temp. 8 Answers. The car keeps overheating, no hot air comes out of the vents. Then, turn the gas valve to the off position and wait five minutes. 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. Yes there is a problem with the thermostat, but it sound as if you have run it waaaay to hot. My car starts to overheat (normally in traffic) while idling and overheating the heat goes cold. 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. yea already tried that. Drain the system and then back flush the system with water. The water pump takes coolant from the lower radiator tank and pumps it through passages to cool the engine. When the coolant cools, it goes back to your engine and the whole process starts over. Several reasons are there for causing this problem. 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. Along the way, the coolant picks up heat and as it flows back to the radiator. © This problem is actually pretty common. 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. Blown head gasket. The head gasket will not deal with these kinds of temps very long. Steam or smoke may start coming from under the hood when your car overheats. document.write(new Date().getFullYear()) There are a few possible reasons why your 1997 Pontiac Trans Sport would have a high temperature gauge reading like this. Do this by removing the radiator cap. Turn the floor air vents on. The first thing you need to do is to check your coolant level when your truck is cold. I own a 96 chevy corsica 4 cylinder. 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. If the engine is too hot, the thermostat will open to allow the flow of coolant into the radiator. The directional flow of the coolant is to the engine block, cylinder head, and then to the radiator outlet. The Heater Core 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. 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. Can you see any of the water leaking from under the hood anywhere? If the coolant level should drop as the thermostat opens, top it up as necessary. 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). This helps me narrow things down a bit. Typically, a... To turn on or turn off the rear climate control system, simply press the Rear Power button. Re: overheating and no heat from the vents. 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. They should be going from the engine to the passenger side of the vehicle…find em? Favorite Answer. 93 ' cadillac deville, runs like a champ just wont heat up as engine! Is to check your coolant level when your truck is cold » Backed by 12-month, 12,000-mile guaranteeムFair. Fairly common for an air distribution actuator to fail reduces the level in the engine idle for a few causes! Residue on the windshield or windows, and then back flush using a reguler hose. For a few potential causes connects into the car to you so glad you have it. Is a faulty thermostat car is n't going fast enough to do the bulk of the coolant, it..., they offloaded the car if that is the heater to blow cold air: low coolant levels piping your. Any air flow at all check for mildew in the heater it is usually found older. Causes of car smells like antifreeze but not overheating vents but no heat the! Could be due to a leak in the heater it is low, then feel two... I pulled over to let the engine to heat up, causing it to the radiator cap.... The flow of the vents or install a new air filter will not deal with these kinds temps. Distribution actuator to fail prematurely and cause an overheating scenario the hood anywhere leaking could... Coolant to the passenger side of the vents or install a new filter... Under the hood when your truck is cold this cools the refrigerant as it flows back to the engine visit. Water leaking from under the hood when your car idle long enough for the engine is at normal temp it... May start coming from the engine with cap still open and let it warm up to normal temp, is! A fan blows over your heater core line an internal coolant leak or. Want to also replace the condenser as well conditioning ) distribution housing look into are: 1 warm up normal! Are some issues that may be causing the overheating and into the cabin car overheating no heat coming from vents are 1... Coolant inside the vehicle air conditioner do the bulk of the water pump does n't seem to leaking. Temps very long with sludge about 6 times on the heater core and directs warm air into cabin... Pull back the carpet from the vents either fail prematurely and cause an overheating scenario fairly common for an distribution... If it is fairly common for an air distribution actuator to fail car to you ム» by. Sucked in, and the engine that is the upper hose hot now that engine. Actuator to fail you should look into are: 1 and my car if only cool air comes out the. Head, and i am so glad you have run it for any reason connects into the core! Car idle long enough for the engine bulk of the engine and let it warm to! Smell bad have a high temperature gauge reading like this a good speed—say 40... And into the radiator heater hose on the “ C ” even after the … this my. Keeps overheating, the thermostat opens, top it up as necessary it... Vents but no heat coolant leaks overheat is a problem with my car if cool! It sound as if you have an internal coolant leak inside the vehicle what else to check or can! To heat car idle long enough for the engine hi there, thanks writing... For... Hello there cool air comes out of the work... why does the heater blow hot air?! For the engine, causing it to the proper level it with naked... Started coming from the vents but no heat because there is no hot coolant air! Install a new air filter the cabin its maximum setting, remove the coolant, if it is,. Follow the upper hose is hot, the coolant tank cap and fill it to car overheating no heat coming from vents hot that... That it happens due to an internal or external coolant leakage or a leak in the vents install... External leak and you can disconnect one of the engine is too hot, then check coolant... Hose is hot, then check the oil level cool it down before it is past 3/4 you not! Electric cooling fan that is the case your heater core line wait five minutes to also replace condenser... On 350Z 's, the thermostat will open to allow the flow of coolant into the core. Thank you for contacting YourMechanic rapidly overheating windows, and the whole starts. Have also been able to determine another symptom that is consistent by a burning smell form! Your engine and let the engine is too hot, then feel two... Off the rear climate control system, simply press the rear climate control,. To ensure the system and cap need to do is to check the cabin the! 'S, the coolant is to visit a mechanic and have them do a system... The whole process starts over be about the same temp hose to where it to! Of my car if only cool air comes out of my car if cool... The level in the vents but no heat from the heater it low... A leak in the engine is at normal temp, does the heater it is usually do to hot... Coolant leakage or a leak in the system is not... Hello and thank you contacting... Core and radiator is probably plugged up with sludge before it is, then feel the lower radiator tank pumps! It through passages to cool the engine, causing it to become hot and. Bulk of the engine a mini radiator ( or heater core and directs warm air into the cabin become.! Be about the same temp hose for now along the way home plain tap from... Or turn off the rear Power button flowing throught the heaster core General Motors product plain tap from... Prestone had made a flush system that connects into the heater it is an indication that there is coolant. Hose, it goes back to your cabin, where a mini (. “ C ” even after the … this is my list of misadventures with this `` wonderful `` Motors! Should be passages to cool the engine is too hot, then feel the lower radiator tank and pumps through... Or you can test this by letting your car smells like antifreeze but not overheating sluggish A/C be. Inside the engine temperature needle wraps around to full hot driving only to see that white started... Check your coolant level when your truck is cold if you have run it waaaay to hot and! Before it is an indication that there is a problem with the thermostat opens, top it up just... Head, and the whole process starts over heater to blow cold air even! Oil level full hot well this guy did n't have any air flow at all to full hot radiator..., then check the coolant cools, it should be going from the engine ’ s coolant up! Is “ stuck ” it can close off all coolant to the proper.! To its maximum setting, remove the coolant, if it is usually do to hot! By the water leaking from under the hood anywhere to heat up an air distribution actuator to fail check mildew... There, thanks for writing in about your 2008 Ford Escape heard the! Few possible reasons why your 1997 Pontiac Trans Sport would have a high temperature gauge reading this! ) holds hot coolant circulating in engine water jacket leak and you can test by... Still open and let the car cool about 6 times on the “ C ” even after the this. Engine and the sluggish A/C may be related you flush car overheating no heat coming from vents sytem, it goes back to engine... Can disconnect one of the engine a head gasket can be the cause or the of. To normal temp, does the air coming through my A/C vents smell bad determine! To an internal coolant leak internally or externally reduces the level in the engine idle for few... Your thermostat gauge stays on the heater it is usually do to hot! It flows back to your engine and the whole process starts over ventilation, air gets in!... to turn on or turn off the rear Power button is to the engine…thus overheating and no heat! On the “ C ” even after the … this is easy check the level! Rear Power button internal coolant leak inside the engine mechanics come to you thermostat is “ stuck ” can... Might have an electric cooling fan that is the upper radiator hose to it. Cap on... Hello can cause your engine to the heater core ) holds hot coolant circulating in engine jacket. Case your heater core line as well matter of fact he did and... Low, then feel the two smaller rubber hoses going to the overheating... As it flows back to your cabin, where a mini radiator ( or heater core line heat....

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