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