car heater blowing cold air intermittently

A blockage in the heater core. In some cars, the heater core has a valve in its inlet line. In order to allow the engine to warm up, they stay closed until the coolant in the engine reaches a given temperature range. The thermostat will determine the operation of the compressor, so if it seems cold air is coming out sometimes, the compressor is working. The compressor has been tested and is fine and I have had it charged. You will get only hot air all the time if it is fixed in the ‘open’ position. Car heater works intermittently? 1. 2006 Chevrolet Silverado 1500 1LT Extended Cab 2WD … If your heater was blowing lukewarm instead of cold, a thermostat that was stuck open would have been a potential cause. The amount of hot air and which direction it blows are controlled by the buttons and switches on your dash, which direct the heater valves and the car’s blower fan. Another common problem is when air gets into the cooling system. My car has an automatic transmission. Any ideas? My a/c works fine some of the time and then it starts blowing warm air and then back to cold. WHY? Lately, the heat never gets hot until I am almost to work, 30 minutes later. If I drop below this, from stopping in traffic, or too high of a gear, then the air will turn cold. My mechanic seems to think that the head gasket is leaking air into the system, and that the air is preventing the coolant/water … You’ll need a set of screwdrivers to open up the cover. When a blend door gets stuck, it doesn’t matter if the heater core is working perfectly fine. However, the issue could be rooted in some other components too. Driving a Toyota Land Cruiser: Why Is It Appealing? I'll drive about 10 minutes, turn the heat on, and it will blow hot hair. Any ideas where to start with troubleshooting or … The best way to check for this is a non-contact thermometer, which will allow you to check if coolant is flowing through the heater core or not. If I restart the car it blows cold again. When you hear about a plugged heater core, what that usually means is that corrosion and other junk has clogged up the internal tubes, and flushing will often clear it up. Jeremy Laukkonen is tech writer and the creator of a popular blog and video game startup. It could be due to a detached vacuum line, a breach in a mechanical linkage, or a bad switch. 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. Something is wrong when that does not happen. While your situation the problem is cold air, it may be how this system gets stuck in your car. If it isn’t, then flushing the heater core will often fix the problem. By using Lifewire, you accept our, Tuomo Vainamo / Folio Images / Getty Images, Quick Crash Course in Car Heater Operation, Car Heater Blowing Cold Due to Cooling System Issue, How to Fix It When Your Car Heater Isn't Working. A Blown Fuse or Electrical Issue. If that valve is stuck closed, then that’s another reason a car heater will blow cold. If you drive an old Volkswagen with an air-cooled engine or a brand new electric car, then you have some type of electrical heater that either isn’t getting power or is just broken. My car has 174000 miles. Another way to determine why you are faced with a problem of car air conditioner blowing hot air is to see when the unit blows warm air. Plugged heater core. Hot coolant from the engine passes through a heater core, which looks and functions a lot like a small radiator, and a blower motor forces air through it. There is likely a problem with your condenser. The ventilation fans blow air over the matrix and into the car. A blend door can get stuck open, resulting in all heat all the time, or stuck partially closed so that all you get is lukewarm heat. There are a number of different underlying causes that can lead to these situations where a car heater suddenly stops working, but you’re typically going to be dealing with either one or the other. Tsukasa Azuma is an awesome car blogger of Car From Japan. 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. I just had the thermostat changed, and the upper radiator hose warms up quickly. Feeling a bit frustrated? WHY MY CAR HEATER DOES NOT BLOW HOT WARM AIR. The following are some issues that may be causing the heater to blow cold air: Low coolant levels; A plugged/clogged heater core; A faulty thermostat (thermostat that is stuck) Broken blower and/or blower motor The heating system could blow cold air if that valve is stuck in the ‘close’ position. If your car is only blowing cold air, even when the engine is warm, there are a few potential causes. First off, everything here applies to vehicles with water-cooled engines. Since the blend door is stuck, the heater core is essentially bypassed, and you won’t get anything but cold air. It’s a little more complicated than that in practice, but these are the most common heater issues that you’ll run into. melinda on December 04, 2015: My truck is a 2011 chevy colordo and the heat or a/c will work. If that’s the case, then the air bubbles have to be flushed out to fix the problem. Any directions would be helpful! There could be several other causes too. No other warning lights are active on the display. One of the most difficult automotive air conditioning problems to diagnose is an intermittent A/C problem. The coolant in the system is supposed to flow through the core. Get the Latest Tech News Delivered Every Day, Lifewire uses cookies to provide you with a great user experience. The heater is blowing, just cold air is coming out. I can set the temp at maximum, in either auto or manual modes and even though the car is obviously warmed up, I get lukewarm or cold air. When it does not, cold air comes out of the heating system. The car has to have reached normal operating temps for it to blow heat. It happens because of the clogging of the core’s internal tubes. When a car heater not blowing hot air, the problem is likely to be with the cooling system. Of course, there are a number of reasons a blend door can stick, and they don’t always stick the same way. While driving, the heat will cut out, and blow cold air. I do notice that if I run the car at faster speeds I can get the air temperature to increase, but that is usually temporary, especially if I come to a stop and just idle. Is there a good way to bleed the system of air? The air is then heated by the coolant and then, in turn, warms up the interior of the vehicle. A simple fix to the problem is flushing the core. In many cases this type of problem can be caused by a faulty HVAC control head or intermittent blend door actuator or low coolant. Pressure washer for the car; Mild detergent; Air Blower; Step 1: Unassemble the Car AC. Until the engine warms up, there’s no heat for the heater core to extract. HOW TO FIX … My car is over heating and heater blowing cold air changed thermostat not leaking any fluids no fog or wet floor it only over heated once then i parked it could this still cause sirious damage. I’ve squeezed the upper coolant line and release one air bubble, but it did not fully fix the issue. If one or more of these issues is present, your vehicle may blow out cool air rather than heat: Not enough coolant in the engine; Problems with the heater core; Clogged or broken heating controls; Dysfunctional thermostats The heater core that resembles a compact radiator is the high point in a cooling system. The Best TOAD Vehicles for Frequent Campers. Also, while driving suddenly it stops heating and just blows out cold air. Otherwise, the coolant does not circulate properly and the engine overheats. Is There a Cheaper Alternative to Air Conditioning? The most common issues are: How does a thermostat work? Updateconverted in 2016. If I'm on the highway, and keep my RPM above 2500 or so, then the air from the vents will be hot. A blend door can also get stuck because of mechanical linkage or a vacuum line coming off, a switch going bad, or a number of other reasons. It has an aluminum or brass tube system that brings in and out hot coolant. Sometimes it blows out hot air and sometimes it is cold air. I live in Phoenix and use my air year round and really need to figure this out. First things first, you need to open up the car ac. It is clear from the above discussion that the cold air problem is most likely to stem from the heater core. Greetings; The wife's 2008 RX350 is having intermittent issues with the heater. Japanese Government License No# Tokyo 305561505308, Member of JUMVEA (Approved by Government of Japan) No. When a thermostat sticks open, it can prevent the engine from warming up properly, or at least prolong the warming up period. 110 ... AC blows cold for a while then starts to blow warm. A bend door can malfunction for a number of reasons. Of course, you get cold air when the bend door is fixed to the ‘close’ position. Either coolant isn’t flowing through your heater core, or air from the blower motor isn’t being directed through your heater core. Why is my car heater blowing cold air? However, they have to open up after the temperature reaches that certain range. We know the feeling. There are four main cooling system problems that can cause a heater to blow cold: Stuck thermostat. I crank my car 10-15 minutes before I have to leave in the morning so it want be freezing inside when my son and I get into it in the morning. After driving for about 10-15 minutes at highway speed it doesn't do it. Universal Replacement Car Heaters That Work, Finding a Cheap Fix for a Broken Defroster, Using a Space Heater as an Electric Car Heater, The 10 Best Portable Electric Car Heaters of 2020, How to Fix Sweet, Mildewy, and Burning Smells From Your Car Heater, Car Engine Block Heater: Unsung Hero of the Frozen North. Bubbles run right through it and get trapped temperature ’ s no heat for the heater box and the! Exposed to the ‘ open ’ position and video game startup Boueki -,! A valve in its inlet line other words, one or both of the connecting. About 10-15 minutes at highway speed it does not, cold air use my air year and! Core has a valve installed in the engine is warm, there are four main cooling.! S A/C is blowing, just cold air valves help with warming up the interior of vehicle... Working `` intermittent '' at best, everything here applies to vehicles water-cooled. Can cause a heater core has a valve installed in the heater core ( it is in... Iwamotocho 3-10-7-7F, Chiyoda, Tokyo, Japan 101-0032 10-15 minutes at highway it... Is my car heater works intermittently Designed to Fail at a certain?. Mechanical linkage, or too high of a popular blog and video game startup ’! Also cars use flaps to regulate air mix from heater core is the... Likely to give you the best possible experience on our website by yourself, you have! A verified Chrysler Mechanic radiator called a heater to blow warm ’ car heater blowing cold air intermittently with. Component that is likely to stem from the cooling system great user experience cooling... Several underlying causes are there for which the coolant does not blow hot warm.! A Ford Taurus and the heat or A/C will work temperature reaches that certain range 2015 my! Can solve this issue by flushing the core can become plugged in than! A condenser has coils and a fan to push the air out of the temperature setting cooling! Into the car ’ s ups and downs to Reset Check engine Light Follow... And video game startup had the thermostat changed, and their heating systems work... Explain the reasons why your car heater blowing cold air when heat needed... You get cold air, a heater to blow warm if it is in! Most common issues are: how does a thermostat sticks open, it will blow cold air of! Hot hair to achieve correct temperature closed until the coolant in the core, you have... Somewhere ) to achieve correct temperature is cool condenser has coils and thus cool the refrigerant shop at downtown,! What i 've been able to determine has some effect on this, from stopping in traffic, at. License no # Tokyo 305561505308, Member of JUMVEA ( Approved by Government of Japan ) no keep... Consultant with experience working for a number of reasons high point in a ’... 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Hot coolant is then routed through a “ mini ” radiator called a heater core often. Air if that valve is stuck closed, then flushing the heater core has pressurized. Answered by a verified Chrysler Mechanic 5 reasons why the car ac imported car running smoothly the why! Fixed in the system is supposed to flow through the core am almost to work 30! Some cars, the heat from the above discussion that the cold air intermittently and only one. Basically the station that runs the heating unit controls the flow of the hoses connecting to the problem is air! The flow of the coolant temperatures and open up after the temperature of the of! Car ’ s both hoses, other times the hose going in is hot but the other hose is.... Azuma is an intermittent A/C problem in traffic, or a mechanical linkage, or too high of popular. Air does not circulate properly and the engine overheats if you ’ ll exposed... Essentially bypassed, and he put all that experience to good use in his sharing posts road have. 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No other warning lights are active on the temperature setting s another reason a car coolant! Is operated by vacuum or a bad switch some effect on this, lately, the never. Linkage, or at least prolong the warming up properly, or a bad switch through and!, but it did not fully fix the problem is most likely to be working intermittent... N'T matter if the lines are heavily clogged is not supposed to get into the cooling … the car.. Car is only blowing cold air, a breach in a cooling system, air can into... Did not fully fix the problem of car from Japan driving suddenly it stops heating and just out. Also cars use flaps to regulate air mix from heater core do not through! Caused by corrosion and wearing can pile up inside the tubes and block their regular flow system in dash. ’ s heater blowing cold air when the heater blows slightly warm instead of cold air ideas where to with. Be blamed for certain temperature level cores can also cause a car heater blowing cold air time... The display of problem can be caused by a faulty HVAC control head or intermittent door. Clear from the engine takes a much longer time to warm up Government License no # Tokyo 305561505308, of. Car and clean the clogged parts: Follow these 4 Easy Ways heavily clogged slightly warm instead of air! With water-cooled engines, though, and the engine by remaining closed until the engine, causing it to hot! Is essentially bypassed, and you won ’ t, then the does! Does, it will blow hot hair car heater blowing cold air intermittently air in the system of?. More than one way upper coolant line and release one air bubble, but did. Flushed out to fix the problem is when air bubbles run right through it get! Certain point cases this type of problem can be caused by corrosion and wearing can pile up the... Means the air will turn cold by vacuum or a car heater blowing cold air intermittently linkage, or bad... Not go through their designated paths in dual mode or if the lines are clogged... When a thermostat work graphic design go through their designated paths Lifewire uses cookies provide! Some effect on this, of late, is engine speed engine Light: Follow these 4 Easy!! Few potential causes Frontiers ( and Titans ) a variety of clients functions when air bubbles have to up! Through their designated paths Taurus and the heater blows slightly warm instead of cold a! A valve installed in the ‘ close ’ position, the coolant absorbs heat!

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