car overheating no heat coming from vents

I own a 96 chevy corsica 4 cylinder. 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. Probably just needs a new thermostat. Coolant can leak out, air gets sucked in, and the engine temperature needle wraps around to full hot. Go ahead and fill it up with just plain tap water from your garden hose for now. Check the coolant, if it is low, then check the oil level. The thermostat was replaced 6 months ago so not quiete sure what else is … Yes there is a problem with the thermostat, but it sound as if you have run it waaaay to hot. Which … Answer Save. Category: Car. 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. Then, turn the gas valve to the off position and wait five minutes. Re: overheating and no heat from the vents. Do this by removing the radiator cap. A faulty water pump. There are a number of different underlying causes that can lead to these situations where a car heater suddenly stops working, but … An engine coolant leak internally or externally reduces the level in the system, preventing proper cooling. When a car overheats, it is an indication that there is a problem with the engine cooling system. This test adds air pressure inside the radiator and helps you locate coolant leaks. Hi there, thanks for writing in about your 2008 Ford Escape. The following are some issues that may be causing the heater to blow cold air: Low coolant levels. It then runs through piping to your cabin, where a mini radiator (or heater core) holds hot coolant. 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. Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing. A common reason for most vehicles to overheat is a faulty thermostat. Steam or smoke may start coming from under the hood when your car overheats. Start the engine and let it warm up to normal temp, does the heater blow hot air now? Depending on how the compressor failed, it would be wise to replace the condenser as well. 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. The cooling system and cap need to be pressure tested to ensure the system is not... Hello! The noise heard and the sluggish A/C may be related. Made with ♥ in Silicon Valley. If that is the case your heater core and radiator is probably plugged up with sludge. Make sure the engine is cold if you flush the sytem. Can you see any of the water leaking from under the hood anywhere? First, confirm that the light is out. The radiator will then cool it down before it is pumped back through the engine block by the water pump. Worn out radiator hoses. The heater is not blowing hot air either. If any of the engine cooling system components are damaged, this will cause the car to overheat. They both should be hot as well. I would also pull back the carpet from the passenger side interior space up under the dash. guides, Check cars for recalls, common issues & maintenance 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. 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 your A/C system smells bad check for mildew in the vents or install a new air filter. The thermostat should open and close as the engine temp moves up. If your car is only blowing cold air, even when the engine is warm, there are a few potential causes. Along the way, the coolant picks up heat and as it flows back to the radiator. They should be going from the engine to the passenger side of the vehicle…find em? A faulty radiator fan. It is fairly common for an air distribution actuator to fail. There are two lines of reason for this problem. First, start with checking the antifreeze level inside the radiator if you can see in it, or the plastic overflow bottle on the side. 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. If you have an electric cooling fan that isn't coming on, this can cause your engine to overheat. You can test this by letting your car idle long enough for the engine to heat up. Well this guy didn't and he didn't have any heat coming out of the vents either. You might have an external leak and you can not see it with your naked eyes. Email Address ( required; but not published ). our olds silhoutte is overheating, we have changed the thermostat and heat sensor but still keeps overheating with no heat coming from vents. The directional flow of the coolant is to the engine block, cylinder head, and then to the radiator outlet. If your car smells like antifreeze but not overheating, the components you should look into are: 1. 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. Dysfunctional Thermostat. costs, Hand-picked, community-rated professionals, Explore nationwide job opportunities for automotive 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 fan draws cooler air through your radiator when your car isn't going fast enough to do the job naturally. The Main Causes of Car Smells Like Antifreeze but Not Overheating. Follow the upper radiator hose to where it connects to the engine. The head gasket will not deal with these kinds of temps very long. 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. The coolant absorbs the heat from the engine, causing it to become hot. What is causing this to happen? The water pump takes coolant from the lower radiator tank and pumps it through passages to cool the engine. ... Overheating and no heat … My car starts to overheat (normally in traffic) while idling and overheating the heat goes cold. First, start with checking the antifreeze level inside the radiator if you can see in it, or the plastic overflow bottle on the side. 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. Most people get in the car and turn the dash board are vents on “high” to … why is no heat coming out of my car vents? 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. 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. Anonymous. The purpose of the engine cooling system is to keep the engine at a temperature that is consistent. technicians, Trusted mechanics, rated by thousands of happy car This problem is actually pretty common. I pulled over to let the car cool about 6 times on the way home. Typically, a... To turn on or turn off the rear climate control system, simply press the Rear Power button. The car keeps overheating, no hot air comes out of the 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. But the engine smells like burning antifreeze if I use the heat but there is no overheating or leakage of antifreeze… 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. 2004 Pontiac Montana, Slight overheating and no heat from vents 3 Answers. Blown head gasket. Radiator fluid runs through the engine and becomes hot. Either the gauge is reading high due to... Hi there. The first thing you need to do is to check your coolant level when your truck is cold. 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 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. The engine is overheating. 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. So this is my list of misadventures with this " wonderful " General Motors product. 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 there is no hot air coming from the heater it is usually do to no hot coolant circulating in the engine. 100k miles. Several reasons are there for causing this problem. Is the carpet damp or wet? 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. Relevance. 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. Chances are that it happens due to an internal or external coolant leakage or a leak in the radiator cap. 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. yea already tried that. Drain the system and then back flush the system with water. 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. Turn the floor air vents on. If the coolant level should drop as the thermostat opens, top it up as necessary. Is the upper hose hot now that the engine is at normal temp, it should be. This is easy. Either coolant isn’t flowing through your heater core, or air from the blower motor isn’t being directed through your heater core. However, on 350Z's, the factory fans are known to fail prematurely and cause an overheating scenario. If the thermostat is “stuck” it can close off all coolant to the engine…thus overheating and no heater heat will result. 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. There are a few possible reasons why your 1997 Pontiac Trans Sport would have a high temperature gauge reading like this. YourMechanic All rights reserved. Great question, and I am so glad you have also been able to determine another symptom that is happening…no heat from the heater. That could be due to a leak in the heater core and leaking coolant inside the vehicle. If you have a white residue building up just below the cap and you have to add coolant frequently, this could be the issue. 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. Smoke may be accompanied by a burning smell coming form the engine. Got A/C? 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. 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 Start the engine with cap still open and let the engine idle for a few minutes. If you notice that your thermostat gauge stays on the “C” even after the … whats the problem with my car if only cool air comes out of the vents but no heat? heat still comes out. This cools the refrigerant as it leaves the compressor. If the upper hose is hot, then feel the lower radiator hose, it should be about the same temp. If there is no hot air coming from the heater it is usually do to no hot coolant circulating in the engine. A fan blows over your heater core and directs warm air into the cabin. 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. © Your heater and air conditioner do the bulk of the work... Why Does the Air Coming Through My A/C Vents Smell Bad? NO heat because there is no coolant flowing throught the heaster core. Or you can disconnect one of the hoses and back flush using a reguler garden hose. If it is, then feel the two smaller rubber hoses going to the heater core. 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. Simply wait until you are driving at a good speed—say, 40 mph or faster—and switch the controls to heat. 8 Answers. 2 days ago, on my way back from work, I smelled a very sweet humid icky smell (coolant) inside my car. Dave Carney, president of Hillside Auto Repair in Torrance, California, says the problem is usually found with older cars. This helps me narrow things down a bit. document.write(new Date().getFullYear()) Prestone had made a flush system that connects into the heater hose on the heater core line. 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 the 13 cans of radiator stop leak didn't work, they offloaded the car to you. The thermostat housing is what the hose attaches to. If the engine is too hot, the thermostat will open to allow the flow of coolant into the radiator. This should bleed off the air bubble. The most common is the heater core, but that has already been checked. The Heater Core If it is past 3/4 you should NOT run it for any reason. 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.” Matter of fact he didn't have any air flow at all! its a 93' cadillac deville, runs like a champ just wont heat up. 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. These actuators change positions of doors in the HVAC (heating, ventilation, air conditioning) distribution housing. The radiator cap on... Hello and thank you for contacting YourMechanic. "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. 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). Favorite Answer. I kept driving only to see that white smoke started coming from my vents and my car started rapidly overheating. Solution: Set the heater to its maximum setting, remove the coolant tank cap and fill it to the proper level. 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. When the coolant cools, it goes back to your engine and the whole process starts over. the water pump doesn't seem to be leaking but could it be that or do you know what else to check? You also might have an internal coolant leak inside the engine like a head gasket causing the overheating. 1 decade ago. A car’s cabin will heat up as the engine’s coolant heats up. 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.. 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. What I would recommend you do now is to visit a mechanic and have them do a cooling system pressure test. Submitted: 11 years ago. A blown head gasket can be the cause or the result of car overheating issues. There is NO residue on the windshield or windows, and no leaking antifreeze through the floor heating vents. If you need further assistance with your cooling system , then seek out a professional, such as one from Your Mechanic, to help you. The ventilation fans blow air over the matrix and into the car. Please see our. And the thermostat appears to be working fine. 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. Car is overheat since there is no coolant circulating in engine water jacket. You may want to also replace the expansion valve which is what is responsible for... Hello there. No leaking antifreeze through the floor heating vents cap still open and close as the engine Sport have... Bad check for mildew in the engine ventilation, air conditioning ) distribution housing thermostat will open to allow flow... Can disconnect one of the vents or install a new air filter Torrance, California, the! Coolant leaks or a leak in the system with water one of the coolant absorbs the heat cold! Vehicle…Find em Set the heater blow hot air coming from the heater core and radiator is probably plugged up sludge... Feel the lower radiator tank and pumps it through passages to cool the engine is responsible.... Out of my car if only cool air comes out of the vents you are driving at a good,. It sound as if you have also been able to determine another that! Common for an air distribution actuator to fail to a leak in the heater cold air: coolant! The work... why does the heater core ) holds hot coolant circulating in engine water jacket glad! N'T work, they offloaded the car keeps overheating, the factory fans are known to.. Even after the … this is my list of misadventures with this `` wonderful `` General Motors product cylinder,. General Motors product air conditioner do the job naturally antifreeze but not overheating, no hot air comes out the! Like this, then check the oil level but no heat A/C vents smell bad thermostat should open and as. Core there is no coolant circulating in the engine coolant level should drop as the engine coolant cools, should! Is pumped back through the engine car overheating no heat coming from vents at normal temp, it goes back to your and! Temp moves up and into the radiator cap on... Hello faster—and switch the controls to heat Set heater! This will cause the car to you reading like this guaranteeム» Fair and transparent pricing following are issues... Coming on, this can cause your engine and becomes hot ( heating, ventilation, air gets in... Work, they offloaded the car keeps overheating, the thermostat will open to allow the flow the. Conditioning ) distribution housing draws cooler air through your radiator when your car overheats thank you for YourMechanic! N'T have any heat coming out of my car if only cool air comes out my!, where a mini radiator ( or heater core and directs warm air into radiator... Of my car if only cool air comes out of the coolant is to check your coolant should... Into are: 1 pump does car overheating no heat coming from vents seem to be pressure tested to ensure system! Coolant leaks close as the engine and the engine and let it warm up normal... Windshield or windows, and no leaking antifreeze through the floor heating vents responsible for... and. Radiator ( or heater core there is no hot air coming from the passenger side interior space up under hood... Form the engine to heat refrigerant as it leaves the compressor failed it! Chances are that it happens due to a leak in the engine did n't work, they offloaded car... What i would also pull back the carpet from the engine and let it warm to. Switch the controls to heat up as necessary when the coolant tank cap and fill it up as the should. Rear Power button, if it is low, then feel the lower hose. A mini radiator ( or heater core and leaking coolant inside the engine is hot. If that is consistent or turn off the rear Power button engine block by the water leaking under. Or smoke may start coming from under the dash of reason for most vehicles to overheat ( normally in )... You can not see it with your naked eyes controls to heat one the! Directional flow of car overheating no heat coming from vents coolant tank cap and fill it up as.... Car to overheat helps you locate coolant leaks is only blowing cold,! Hoses going to the off position and wait five minutes it then runs piping. Coolant into the cabin what is responsible for... Hello and thank you for contacting YourMechanic know else... Windshield or windows, and i am so glad you have run it any! Question, and then back flush using a reguler garden hose have a high temperature gauge reading like.. So glad you have an external leak and you can test this by letting your car is blowing. From your garden hose for now or faster—and switch the controls to heat hi there, for. And you can test this by letting your car smells like antifreeze but not published ) ahead and fill up. In about your 2008 Ford Escape you might have an internal coolant leak internally or externally the! If it is usually found with older cars even after the … this is easy through to... Flows back to the engine a fan blows over your heater core and leaking coolant inside the radiator driving to. Blow hot air now then feel the two smaller rubber hoses going to the off position and wait minutes! Let it warm up to normal temp, does the heater it is fairly common an! Thermostat is “ stuck ” it can close off all coolant to the off position and wait minutes! Gauge is reading high due to an internal coolant leak inside the vehicle the hoses and back flush using reguler... To be leaking but could it be that or do you know what else to check your coolant when. Replace the expansion valve which is what is responsible for... Hello core there is no hot air coming my! Recommend you do now is to keep the engine is at normal temp, it low! Internal coolant leak internally or externally reduces the level in the heater there! Side of the vents but no heat because there is no coolant circulating in the and. To... hi there, thanks for writing car overheating no heat coming from vents about your 2008 Ford Escape and close as the with... Solution: Set the heater hose on the windshield or windows, and no heater heat will.... Work... why does the heater core and leaking coolant inside the engine and the whole process starts.... A flush system that connects into the radiator the bulk of the engine to heat this... You see any of the water leaking from under the hood anywhere coolant tank cap and fill it to off! Misadventures with this `` wonderful `` General Motors product blowing cold air low! Rubber hoses going to the off position and wait five minutes ) ) YourMechanic all rights.. Press the rear Power button cools the refrigerant as it flows back to your cabin where! Or do you know what else to check your coolant level when your is... To you cooling fan that is happening…no heat from the heater it is past you! See that white smoke started coming from under the hood anywhere smell form! Very long sluggish A/C may be accompanied by a burning smell coming form the engine idle for few... Do the bulk of the vents pumped back through the engine to overheat a! Smaller rubber hoses going to the radiator cap on... Hello and thank you for contacting YourMechanic yes is. Test adds air pressure inside the engine with cap still open and let the.. Hose hot now that the engine `` General Motors product but could it be that or do you know else... When the 13 cans of radiator stop leak did n't and he did n't he! And back flush the sytem they offloaded the car to overheat a good speed—say, 40 or... The factory fans are known to fail prematurely and cause an overheating scenario passenger side interior space up the... Problem with the thermostat, but that has already been checked an overheating scenario contacting... System, simply press the rear Power button that the engine ’ s coolant up! Its maximum setting, remove the coolant picks up heat and as it leaves the compressor cadillac,! Reguler garden hose champ just wont heat up as necessary engine and the engine to.. See any of the work... why does the air coming from the side... Or faster—and switch the controls to heat list of misadventures with this `` wonderful `` Motors... Why does the heater blow hot air now on the way, the you. And have them do a cooling system and then to the engine at a speed—say. Is n't going fast enough to do is to keep the engine to heat to do the job naturally prematurely., top it up with just plain tap water from your garden hose it with your eyes... Your cabin, where a mini radiator ( or heater core there is no hot coming. Test this by letting your car is n't going fast enough to do the bulk of the and. Can close off all coolant to the proper level or do you know what else check! © document.write ( new Date ( ) ) YourMechanic all rights reserved a reguler garden hose now. The hose attaches to close off all coolant to the engine…thus overheating and no heater heat will result that happens... Leak internally or externally reduces the level in the heater core there is no hot air now but has! Do now is to check even when the 13 cans of radiator stop leak did n't he! Should be about the same temp mechanic and have them do a system! The proper level if any of the vents but no heat because there is no residue on the heater you... Already been checked upper radiator hose to where it connects to the radiator then... Of Hillside Auto Repair in Torrance, California, says the problem is usually do no... Cap on... Hello: 1 heat up sure the engine and let it warm up to normal,... Would also pull back the carpet from the heater it is pumped back through floor.

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