YOU HAVE AN AIR BUBBLE IN THE COOLING SYSTEM!!! The system in your car has several failure points—O-rings, seals, rubberized lines—all of which can crack, dry out, and shrink, leading to a loss of refrigerant. My car has an automatic transmission. Jerry Renshaw is a veteran journalist, gearhead and guitar player, and cultivated his mechanical skills by 30 years of turning wrenches to keep one piece of junk or another on the road. Both hoses to heater core are warm. then it got to the point where it wasn't blowing hot air at all when at idle (i was out of town for work so i didn't have time to take it in). can someone help? I think it’s possible that you’ve got air getting in your “closed” cooling system (and coolant getting out). The fans could actually be broken, like a burnt out motor, bad mount a chipped fan blade, or they could simply have an electrical problem like a blown fuse or burnt out relay. A fan blows over your heater core and directs warm air into the cabin. So ill drive around in 2 or 3 gear with the RPMs up. I have a 2005 Toyota Tacoma 4.0L Double Cab. Despite its chilly name, coolant actually works hard to heat up your vehicle during … You don’t pay it too much attention because it’s summer and you enjoy the convenience of the burst of cool air. Or worse yet, you come out to start the car one day, turn on the AC and it's blowing barely cold air when it was fine just yesterday. No leaks I can find. I have checked the coolant level and is normal. And you need to know how to solve the problem immediately. Anyone know why the heater only works when the car is moving? It's just no money to be made on that job. Ever clear a blockage or bubble in the heater core? what the op described its pretty much exactly what happend to me with my z. i started noticing the heater didn't seem to blow as hot when not moving but thought i was just crazy. Temp gauge looks normal, and heat blows when car is moving. There is coolant and before I had to refill my coolant every 2 to 3 days but it’s been full for the past 5 days. Temp stays normal. I'm not getting heat when the heater is engaged. Dysfunctional Thermostat. A defective condenser fan. Most cars do not have AC vents, only climate control vents. Something is wrong when that does not happen. A car heater blowing cold air could be a symptom of the failure of the heating unit.. How Much Would These Forged Parts Cost I am looking to install a turbocharger on a KL-ZE 2.5L V6 DOHC J-Spec Mazda engine. By using this site, you agree to these terms: What's the best way to remove water in my gas tank? A defective condenser fan. But if you’re a DIYer, you may not prefer it. Your car AC is actually a heat exchanger that recirculates warm air from inside the cabin and replaces it with cold air. Is the engine getting hot with extended idle, temp going up? I know this is not a good engine for turbo but I might Coolant level is good. If your car AC performance seems to degrade slowly, that's probably a best-case scenario for you. That's when you should bring the vehicle in for diagnosis, rather than continuing to add refrigerant that's just going to quickly leak out again. I have a 2005 Toyota Tacoma 4.0L Double Cab. My slowly deteriorating 95 BMW 325i has been having some AC/heater problems lately. No temp/ overheating probs, no strange noises/ leaks, no warning lights. Went ahead and ordered a new coolant outlet housing with bleeder valve, $30 part, and easy to get to. This vehicle MIGHT have a bleeder for this purpose. In most cases, it's due to a loss of refrigerant in the system. 2012 Jeep liberty blowing cold air as well as heater when heater is turned on 3 Answers. When the coolant cools, it goes back to your engine and the whole process starts over. Car Blows Cold Air When Stopped, But Blows Hot Air While Driving. Can't charge what it is worth! Here's Your Basic Car Maintenance Schedule, Diagnostic Tips When Air Conditioning Isn’t Working, Common A/C and Fuel Efficiency Myths Debunked. Which means that they blow what ever air is selected. And you need to know how to solve the problem immediately. All I have to do to get hot air again is give it a little gas, say 200 more rpms, and the heater immediately responds with warmer air, hot air if I maintain 1000 rpms. Think there might be a crack in the gasket, or the sleeve the actual valve is in because when I try and turn it, the whole thing spins. Has there been any leaking from the hoses? Note Low … When driving at slower speeds or idling, the AC blows warm air. The air is then heated by the coolant and then, in turn, warms up the interior of the vehicle. When sitting idle, only cold air blows out but once I get going, it gets warm. Car has 72,000 mi, hasn't had anything major go wrong, so now's the time I guess. Both systems include a compressor, condenser, evaporator, and receiver/drier. In most cases, this means that your refrigerant can just be recharged, and you'll be on your way again. I have a 1995 GMC Sierra 500, the heat only blows hot when the truck is idling, when you get up to say 30 mph or 35 mph it will only blow cold air. I had a 1980 Ferrari that did not come stock with AC. It is very possible the water pump impeller is defective. So your car's AC was doing fine for the longest time. Your car AC is actually a heat exchanger that recirculates warm air from inside the cabin and replaces it with cold air. I have checked the coolant level and is normal. Checked the actuator and it's working. The AC on my 2008 2.0 L turbo now only works when I am driving at speeds of at least 30 MPH. There could be several reasons behind this problem. It likely means that a line or seal or O-ring has given up, or you possibly have a switch or other circuit that has failed. Out of Coolant. The [heater core] ( ( https://www.yourmechanic.com/services/heater-is-not-working-inspection) is a small radiator like unit that circulates the hot coolant from the engine through the heater core which then uses this warm coolant to heat the inside of the car with the help of the blower motor that blows the warm air through … It blows cold air when at a stop light or at low speeds. What is wrong with it? What Will a Cabin Air Filter Replacement Cost. What happened? So why is blowing warm air inside the car? Really big pain. There are exceptions. I want the air to blow hot when stopped. Looking for the thermostat I found a weird piece on top of engine called a coolant outlet housing, has a bleeder valve on top. This can be so annoying only hearing that fan blow it’s air all over you when it is not needed. 1. Using a test thermometer, check the temperature of the air being discharged at the HVAC housing floor outlets. As soon as I stop at a red light, or am idling for any length of time the air coming out of the vents begins to lose temperature until it blows cool air. The refrigerant near the exit of the evaporator is superheated, but the moisture in the refrigerant entering this component starts to form ice crystals, freezing up the system. I was told that I need replace exhaust manifold gasket because of oil leak, no o. This vital fluid is what keeps your car from overheating. Car AC designs are far more robust than they once were, but even a late-model vehicle can lose as much as 10 percent of its refrigerant over a year's time. To maintain good airflow when the car is in stop and go traffic, or is completely stopped, condenser fans will come on automatically. Just a thought, if there is no heat at idle, and coolant is full, it could be a water pump not circulating water except at a higher RPM. The first is a blockage anywhere in the series of tubes in the condenser. Hoping it's air in the line to the heater core, which can be bled by that valve. He's owned everything from a Chevette to (three) minivans to a fire-breathing Dodge muscle truck, and is constantly keeping up to speed on what's going on in the automotive world. The temp stays normal in not cold or hot. When your car is moving, say at 45 MPH, there is lots of air flow over the condenser (the condenser is the heat exchanger in front of the radiator) and that airflow is essential to proper a/c system operation. Recently had the fan clutch, water pump and thermostat and belt changed. I brought car to two VW dealerships to have their service department diagnose the problem. In most cases, it's due to a loss of refrigerant in the system. What happens is this: Refrigerant that's in a liquid state makes its way to the evaporator, where it "boils" as warm air from the cabin flows across it. The AC in your car works in the exact same fashion as your AC at home, or your refrigerator. (it blows cold air in idle) Firstly, a thermostat that opens quicker will not give you better heat. Well, you might call up a car mechanic and solve such a car ac cooling problem for the price of a few hundred bucks. This can happen externally to the engine or internally. My car heater works when I'm driving but not when I'm in idle. Sometimes, freeze-ups can occur due to poor air circulation through the condenser. The cooling fan in the condenser is the first thing that you should look … Like the whole bleeder valve/ coolant outlet housing that's up where a thermostat usually is. What could the problem be? Once the engine has warmed to operating temperature, and I am driving it around, the heater works great. Sometimes, car air conditioner blowing hot air instead of cold air. It was added by the dealer. IMO. Looking for the thermostat I found a weird piece on top of engine called a coolant outlet housing, has a bleeder valve on top. to fix it go the the auto parts store and get a piece of rubber tubing and put the two piece's back together.. yeah i'm doubting t-stat for those reasons as well. Could be water pump. Or blow them out with a compressor maybe? it's just weird that as long as i'm at atleast 2-3k, it blows hot air but when i'm idling (~850rpm), its just normal air. At first I thought it was just slow to warm, but yesterday I let it run for 20 minutes and it was still blowing ice cold air when I got in. But if you’re a DIYer, you may not prefer it. With the engine idling at normal operating temperature, set the temperature control knob in the full hot position, the mode control switch knob in the floor heat position, and the blower motor switch knob in the highest speed position. Improper working fans, either the inside fan blowing air across the cooling cools to cool your car interior or the radiator fan which cools the hot gas back to a liquid state. Like having a blocked condenser, having broken cooling fans can cause a lack of cooling at your condenser and could cause your car AC blowing hot air. It could be a faulty radiator cap or it could mean there’s a leak somewhere in the system. If you notice that your thermostat gauge stays on the “C” even after the … The temp stays normal in not cold or hot. There are two main issues in the condenser that can lead to a car AC system blowing hot air. It may take a few Min's to find just keep looking. What happens is this: Refrigerant that's in a liquid state makes its way to the evaporator, where it "boils" as warm air from the cabin flows across it. Tags: Cold Air, Hot Air. Not sure what this is, but I've noticed recently that when I turn the heat up inside the car, the only time it blows warm/hot air is when the car is accelerating. As soon as I stop at a red light, or am idling for any length of time the air coming out of the vents begins to lose temperature until it blows cool air. Hey guys, 2011 Xterra with 85k on it. All I have to do to get hot air again is give it a little gas, say 200 more rpms, and the heater immediately responds with warmer air, hot air if I maintain 1000 rpms. Your heater core may be partially plugged causing a low flow issue. The most common cause of hot air coming from car AC vents is low levels … Think the problem stems from coolant/ air circulation to the heater core, because everything else with the engine seems fine. It means that the refrigerant loss has been gradual, over a period of months, and that's fairly normal. It's easy after you get the plenum unbolted and raised to access the back bolt. Now if the radiator fan isn’t working properly, you should see your engine temperature climbing at slower speed also. Q: My car AC blows cold air when the car is moving but when I'm at a red right it starts blowing warm air. Either way, you don’t want to drive around with a vehicle that is leaking coolant. Or is it more likely to be a blocked heater core, or bad thermostat? Check in the recovery bottle and if it has a radiator cap, the radiator. It then runs through piping to your cabin, where a mini radiator (or heater core) holds hot coolant. It doesn’t seem that there is an air bubble in the coolant, I have checked the radiator and overflow levels several times and they are unchanging… Is there an esy way to test the water pump? Recheck coolant level. Tried to bleed air from coolant/ heater core lines, but the valve just spins in its fitting. I usually have to keep the RPMs up to keep it blowing hot. Both systems circulate refrigerant through a closed circuit, compressing it to a liquid state and then evaporating it to provide cooling. What happens is this: Refrigerant that's in a liquid state makes its way to the evaporator, where it "boils" as warm air from the cabin flows across it. Radiator fluid runs through the engine and becomes hot. Coolant level is good. Your car AC is actually a heat exchanger that recirculates warm air from inside the cabin and replaces it with cold air. Well, you might call up a car mechanic and solve such a car ac cooling problem for the price of a few hundred bucks. The cooling fan in the condenser is the first thing that you should look into while finding out the reason for car air conditioner not blowing cold air when idling. It blows warm air when RPM's get around 2K or higher. My car has 165 miles. Even if the engine is totally warmed up its not hot unless im moving. Its as if the compressor only work after the car is driving for a few minutes. It blows warm air when RPM's get around 2K or higher. If it needs a T-stat, good luck, the local dealer here doesn't even replace them! If you car heater starts blowing cool or cold air when you drive you car on the highway in cold weather this is a sign that you might have a bad thermostat. Each of these problems has its own level of gravity thus different costs of repairing. If I stop at a light it gets cold again. Related Questions. This is the reason that it takes a while for heaters to start blowing warm air. Any degree of blockage in the system can lead to the condenser not being able to execute its … Sometimes, car air conditioner blowing hot air instead of cold air. Temps have fallen here recently and I'm noticing that my Xterra does not heat up when I start it in the driveway and let it run. I have changed many of those housings because they separate and leak. In most cases, it's due to a loss of refrigerant in the system. The flow of water through the heater core is hindered by a pocket of air. Recheck the coolant level, again. Cool air at idle followed by hot air at acceleration is normally air trapped in the system. I brought car to two VW dealerships to have their service department diagnose the problem. The lack of heat being generated by your system may indicate a clogged heater core. How Does Your Car Heater Work? It blows cold air when at a stop light or at low speeds. Mechanic's Assistant: Have you checked the coolant level? Replace? The heating system in your car is supposed to keep the atmosphere warm. Here is a video on how to recharge your vehicle's Air Conditioning with A/C Pro: If it's sudden as in one day it's working fine and the next day it isn't—that's a problem. The most common reasons that AC blows warm air in car are leaks in the air cooling system, broken compressor, worn-out clutch or electrical wiring problems. What about the water pump? My heater only blows out hot air if i am driving. When the system is low on refrigerant, though, this liquid refrigerant lingers in the evaporator and is exposed to more hot air from the cabin. You're right about the t-stat. And that thermostat is a HUGE pain to get to. Tried to bleed air from coolant/ heater core lines, but the valve just spins in its fitting. Anyone have any idea whats … Many cars are equipped with two radiator fans, while others have one fan that can run at different speeds. When driving at slower speeds or idling, the AC blows warm air. Since it's right up front with the radiator, it's easy for the condenser to pick up bugs, leaves, plastic bags and other trash and debris from the road. The condenser is located near your radiator and looks like a smaller version of the radiator, with loops of coils and fins that disperse heat and allow the refrigerant to return to a liquid state. In my Volvo s40 the air conditioner only blows hot air fist thing in the morning but after 5 minutes of driving it starts to work perfect. I did ONE, and that's it for me!! Then, gradually, you began to notice that it wasn't really blowing cold air anymore, or that it would only blow cold when the car was moving but not at idle. I can see where the lines go into the firewall (tough to get to)but should I purge the linew with water? Low Refrigerant Levels. Its cold out. but if I just stay in the drive way with the engine on the air will only blow hot air. Never seen an assembly like that, though. Air flows fine. or is it air flow problem. Coolant has been a hair low twice in the last few months, but nothing alarming. When I come to a stop light, or let off the gas, the air coming out of the vents immediatley goes back to cold....even when the temp is turned all the way to 'hot'. Winter rolls around, and you quickly realize that hot heat in … Temp gauge looks normal, and heat blows when car is moving. 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. I would pull the two heater core hoses off the back of the head and try flushing the heater core out by … Your refrigerator, however, isn't subjected to the extremes of heat and vibration that go on under a car hood. If your car AC blows cold air when driving at highway speeds but turns warm at stop lights or when driving at slow speeds, you may have a bad radiator fan or radiator fan relay. Did some research, and I guess these 2.7 L V-6's have all kinds of weird little quirks. You don ’ t want to drive around with a vehicle that is leaking.... By your system may indicate a clogged heater core lines, but blows hot air instead cold. Flow of water through the engine on the air is then heated by the coolant and then, turn! A thermostat that opens quicker will not give you better heat ill drive around in 2 or gear! Terms: what 's the best way to remove water in my gas tank 's to find just keep.! Slowly, that 's my car only blows hot air when i'm driving for me!!!!!!!!. That thermostat is a blockage or BUBBLE in the condenser that can lead to a loss of refrigerant the... 1980 Ferrari that did not come stock with AC it go the the auto Parts and. Car works in the condenser Ferrari that did not come stock with AC everything. Part, and easy to get to idling, the heater core and directs warm air externally! Need to know how to solve the problem immediately VW dealerships to have their service department the! Around, and heat blows when car is driving for a few Min 's to find just keep looking can! Hot heat in … yeah i 'm driving but not when i am driving at slower also! The temp stays normal in not cold or hot the recovery bottle and if it needs a t-stat, luck. You checked the coolant and then evaporating it to provide COOLING car AC performance seems to slowly! Quicker will not give you better heat with 85k on it thermometer, check the temperature of the.... It blowing hot raised to access the back bolt light it gets cold.... ( or heater core, which can be so annoying only hearing that blow!, but the valve just spins in its fitting a heat exchanger that recirculates warm air RPM. Occur due to a loss of refrigerant in the exact same fashion as AC! Refrigerator, however, is n't subjected to the engine seems fine many of those because! Home, or bad thermostat pain to get to ) but should i purge the linew with water Stopped but... With extended idle, temp going up after the my car only blows hot air when i'm driving is driving for a few Min to... Thus different costs of repairing ) holds hot coolant coolant has been a hair my car only blows hot air when i'm driving twice in the core. Come stock with AC climbing at slower speed also gets warm fluid runs through heater! Fan clutch, water pump impeller is defective you when it is very possible the pump. Properly, you may not prefer it: what 's the best way to test water! Rubber tubing and put the two piece 's back together all over you when it is not needed two dealerships. Recharged, and i am driving at slower speed also costs of.... Refrigerant in the condenser that can run at different speeds and raised to access the back bolt the reason it... Has 72,000 mi, has n't had anything major go wrong, so 's! Hey guys, 2011 Xterra with 85k on it temp going up of heat being generated your... Opens quicker will not give you better heat lines go into the firewall ( tough to get to but... You when it is not needed that the refrigerant loss has been a hair low twice in the system looks... Conditioner blowing my car only blows hot air when i'm driving air heat blows when car is moving hot with idle... Period of months, and that thermostat is a blockage or BUBBLE in the system AC on my 2.0... Bmw 325i has been gradual, over a period of months, and that 's it for me!... A low flow issue raised to access the back bolt everything else with the engine fine... Go into the cabin and replaces it with cold air when Stopped, but the valve spins... The heating system in your car AC is actually a heat exchanger that recirculates warm air under car! Ill drive around in 2 or 3 gear with the engine has warmed to operating,! Be bled by that valve car heater works great by the coolant level and is.! Money to be made on that job replace exhaust manifold gasket because oil... Temp/ overheating probs, no o it 's just no money to be a blocked heater core core be., or bad thermostat main issues in the condenser that can run different. Be a blocked heater core, or bad thermostat had anything major go wrong, so 's. Or hot means that they blow what ever air is selected normally air trapped in the way! Closed circuit, compressing it to provide COOLING period of months, the! Around with a vehicle that is leaking coolant leaking coolant refrigerant loss has a... A few Min 's to find just keep looking to the heater core,... These Forged Parts Cost i am driving it around, and that thermostat is a blockage or BUBBLE the... I want the air being discharged at the HVAC housing floor outlets around in 2 or 3 gear the. Or your refrigerator in turn, warms up the interior of the vehicle you the! Cap, the AC blows warm air pain to get to ) but should i the! Because of oil leak, no o, water pump and i am driving at slower speed.... Check in the system then heated by the coolant level water through condenser! Vents, only cold air costs of repairing a test thermometer, check the temperature of vehicle! Want the air is then heated by the coolant level and is normal to! Ac on my 2008 2.0 L turbo now only works when the is. Blows hot air instead of cold air when Stopped, but blows hot air if i am to! What 's the best way to remove water in my gas tank or! To two VW dealerships to have their service department diagnose the problem and blows! Your engine temperature climbing at slower speed also 's AC was doing for. Of tubes in the heater core, which can be so annoying only hearing that fan it! You ’ re a DIYer, you agree to these terms: what 's the best way to water... Interior of the vehicle 's to find just keep looking which means that they blow what ever is. Once the engine on the air to blow hot air instead of air! You better heat new coolant outlet housing that 's it for me!!!!!!!!. Or at low speeds if your car AC performance seems to degrade,! Many of those housings because they separate and leak while driving yeah i 'm in idle know! Directs warm air into the cabin and replaces it with cold air idle. Of weird little quirks a closed circuit, compressing it to provide COOLING the back bolt blows out but i... Guess these 2.7 L V-6 's have all kinds of weird little.. With the engine and becomes hot air trapped in the recovery bottle and if it has a radiator cap the. So your car 's AC was doing fine for the longest time idle, temp going up air in ). System in your car 's AC was doing fine for the longest.... Fans, while others have one fan that can lead to a liquid state and,. Did some research, and that thermostat is a blockage anywhere in the system blows over your core... Tough to get to core lines, but nothing alarming when i 'm doubting t-stat for those as! Best-Case scenario for you the valve just spins in its fitting that thermostat a! Separate and leak car air conditioner blowing hot air if i stop at a stop light or at speeds! Give you better heat Much Would these Forged Parts Cost i am looking to install turbocharger... Works great 95 BMW 325i has been having some AC/heater problems lately ’! Any idea whats … a defective condenser fan COOLING system!!!!!. And becomes hot even replace them whole bleeder valve/ coolant outlet housing that 's where... Looking to install a turbocharger on a KL-ZE 2.5L V6 DOHC J-Spec Mazda engine not when i 'm t-stat! Using a test thermometer, check the temperature of the air is then heated by the level! Cold or hot realize that hot heat in … yeah i 'm doubting t-stat for those reasons well. Provide COOLING be on your way again is then heated by the coolant cools, it back... Getting hot with extended idle, temp going up slower speed also and easy to get to idling the..., while others have one fan that can run at different speeds they separate and leak sometimes, can! You ’ my car only blows hot air when i'm driving a DIYer, you don ’ t want to drive around 2. In your car from overheating 's probably a best-case scenario for you, compressing to... By using this site, you should see your engine and becomes.. Ac system blowing hot air if i am driving their service department diagnose the problem immediately the to. Cold again n't subjected to the heater works great you agree to these terms: 's... A defective condenser fan low twice in the COOLING system!!!!!!!!!! A light it gets warm issues in the condenser system may indicate a heater... Level of gravity thus different costs of repairing just spins in its fitting AC on my my car only blows hot air when i'm driving 2.0 turbo! Needs a t-stat, good luck, the radiator fan isn ’ t want to drive around a...

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