There could be several reasons behind this problem. Tried to bleed air from coolant/ heater core lines, but the valve just spins in its fitting. I brought car to two VW dealerships to have their service department diagnose the problem. Here's Your Basic Car Maintenance Schedule, Diagnostic Tips When Air Conditioning Isn’t Working, Common A/C and Fuel Efficiency Myths Debunked. Coolant has been a hair low twice in the last few months, but nothing alarming. 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 the whole bleeder valve/ coolant outlet housing that's up where a thermostat usually is. Low Refrigerant Levels. 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. Has there been any leaking from the hoses? 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. And you need to know how to solve the problem immediately. By using this site, you agree to these terms: What's the best way to remove water in my gas tank? Now if the radiator fan isn’t working properly, you should see your engine temperature climbing at slower speed also. What could the problem be? Did some research, and I guess these 2.7 L V-6's have all kinds of weird little quirks. It's just no money to be made on that job. You're right about the t-stat. 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. can someone help? 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. Think the problem stems from coolant/ air circulation to the heater core, because everything else with the engine seems fine. 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. 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. I did ONE, and that's it for me!! 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. I think it’s possible that you’ve got air getting in your “closed” cooling system (and coolant getting out). Recheck the coolant level, again. Winter rolls around, and you quickly realize that hot heat in … Car Blows Cold Air When Stopped, But Blows Hot Air While Driving. You don’t pay it too much attention because it’s summer and you enjoy the convenience of the burst of cool air. 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. In most cases, it's due to a loss of refrigerant in the system. 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. Both hoses to heater core are warm. 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. 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. to fix it go the the auto parts store and get a piece of rubber tubing and put the two piece's back together.. No leaks I can find. Note Low … Cool air at idle followed by hot air at acceleration is normally air trapped in the system. It blows cold air when at a stop light or at low speeds. Coolant level is good. Once the engine has warmed to operating temperature, and I am driving it around, the heater works great. Air flows fine. 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. No temp/ overheating probs, no strange noises/ leaks, no warning lights. Sometimes, freeze-ups can occur due to poor air circulation through the condenser. 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. It then runs through piping to your cabin, where a mini radiator (or heater core) holds hot coolant. 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. 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. It is very possible the water pump impeller is defective. 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. I usually have to keep the RPMs up to keep it blowing hot. The lack of heat being generated by your system may indicate a clogged heater core. And that thermostat is a HUGE pain to get to. 1. My slowly deteriorating 95 BMW 325i has been having some AC/heater problems lately. In most cases, it's due to a loss of refrigerant in the system. A fan blows over your heater core and directs warm air into the cabin. 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. Despite its chilly name, coolant actually works hard to heat up your vehicle during … The heating system in your car is supposed to keep the atmosphere warm. Each of these problems has its own level of gravity thus different costs of repairing. 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. Sometimes, car air conditioner blowing hot air instead of cold air. 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. I was told that I need replace exhaust manifold gasket because of oil leak, no o. Any degree of blockage in the system can lead to the condenser not being able to execute its … Most cars do not have AC vents, only climate control vents. Check in the recovery bottle and if it has a radiator cap, the radiator. But if you’re a DIYer, you may not prefer it. In most cases, it's due to a loss of refrigerant in the system. Well, you might call up a car mechanic and solve such a car ac cooling problem for the price of a few hundred bucks. I'm not getting heat when the heater is engaged. Using a test thermometer, check the temperature of the air being discharged at the HVAC housing floor outlets. When sitting idle, only cold air blows out but once I get going, it gets warm. In most cases, this means that your refrigerant can just be recharged, and you'll be on your way again. This vehicle MIGHT have a bleeder for this purpose. Mechanic's Assistant: Have you checked the coolant level? 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. Your car AC is actually a heat exchanger that recirculates warm air from inside the cabin and replaces it with cold air. Looking for the thermostat I found a weird piece on top of engine called a coolant outlet housing, has a bleeder valve on top. It was added by the dealer. I can see where the lines go into the firewall (tough to get to)but should I purge the linew with water? My car has 165 miles. 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. 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. It means that the refrigerant loss has been gradual, over a period of months, and that's fairly normal. Dysfunctional Thermostat. This vital fluid is what keeps your car from overheating. A car heater blowing cold air could be a symptom of the failure of the heating unit.. I would pull the two heater core hoses off the back of the head and try flushing the heater core out by … 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. If your car AC performance seems to degrade slowly, that's probably a best-case scenario for you. Which means that they blow what ever air is selected. This can happen externally to the engine or internally. I have checked the coolant level and is normal. The most common cause of hot air coming from car AC vents is low levels … 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. What happened? Replace? 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. This is the reason that it takes a while for heaters to start blowing warm air. I had a 1980 Ferrari that did not come stock with AC. Car has 72,000 mi, hasn't had anything major go wrong, so now's the time I guess. My car has an automatic transmission. Anyone have any idea whats … I have checked the coolant level and is normal. 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 could be a faulty radiator cap or it could mean there’s a leak somewhere in the system. Tried to bleed air from coolant/ heater core lines, but the valve just spins in its fitting. Or is it more likely to be a blocked heater core, or bad thermostat? The flow of water through the heater core is hindered by a pocket of air. A defective condenser fan. but if I just stay in the drive way with the engine on the air will only blow hot air. The first is a blockage anywhere in the series of tubes in the condenser. It may take a few Min's to find just keep looking. 2012 Jeep liberty blowing cold air as well as heater when heater is turned on 3 Answers. 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. 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. What is wrong with it? Looking for the thermostat I found a weird piece on top of engine called a coolant outlet housing, has a bleeder valve on top. 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 temp stays normal in not cold or hot. Coolant level is good. I want the air to blow hot when stopped. Hey guys, 2011 Xterra with 85k on it. The air is then heated by the coolant and then, in turn, warms up the interior of the vehicle. Your heater core may be partially plugged causing a low flow issue. Out of Coolant. I know this is not a good engine for turbo but I might It blows cold air when at a stop light or at low speeds. To maintain good airflow when the car is in stop and go traffic, or is completely stopped, condenser fans will come on automatically. 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). yeah i'm doubting t-stat for those reasons as well. Temp gauge looks normal, and heat blows when car is moving. The cooling fan in the condenser is the first thing that you should look … Your car AC is actually a heat exchanger that recirculates warm air from inside the cabin and replaces it with cold air. What Will a Cabin Air Filter Replacement Cost. When driving at slower speeds or idling, the AC blows warm air. Could be water pump. A defective condenser fan. Ever clear a blockage or bubble in the heater core? 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. If I stop at a light it gets cold again. Temp gauge looks normal, and heat blows when car is moving. My car heater works when I'm driving but not when I'm in idle. Tags: Cold Air, Hot Air. Anyone know why the heater only works when the car is moving? Even if the engine is totally warmed up its not hot unless im moving. 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. Temp stays normal. If you notice that your thermostat gauge stays on the “C” even after the … 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. But if you’re a DIYer, you may not prefer it. Your refrigerator, however, isn't subjected to the extremes of heat and vibration that go on under a car hood. I have changed many of those housings because they separate and leak. 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. So why is blowing warm air inside the car? Many cars are equipped with two radiator fans, while others have one fan that can run at different speeds. What about the water pump? or is it air flow problem. The AC in your car works in the exact same fashion as your AC at home, or your refrigerator. Something is wrong when that does not happen. This can be so annoying only hearing that fan blow it’s air all over you when it is not needed. And you need to know how to solve the problem immediately. 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. Is there an esy way to test the water pump? (it blows cold air in idle) Firstly, a thermostat that opens quicker will not give you better heat. It's easy after you get the plenum unbolted and raised to access the back bolt. Recently had the fan clutch, water pump and thermostat and belt changed. 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. When driving at slower speeds or idling, the AC blows warm air. When the coolant cools, it goes back to your engine and the whole process starts over. Can't charge what it is worth! My heater only blows out hot air if i am driving. Or blow them out with a compressor maybe? 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… Either way, you don’t want to drive around with a vehicle that is leaking coolant. The temp stays normal in not cold or hot. I have a 2005 Toyota Tacoma 4.0L Double Cab. Went ahead and ordered a new coolant outlet housing with bleeder valve, $30 part, and easy to get to. If it needs a T-stat, good luck, the local dealer here doesn't even replace them! IMO. So your car's AC was doing fine for the longest time. Both systems circulate refrigerant through a closed circuit, compressing it to a liquid state and then evaporating it to provide cooling. So ill drive around in 2 or 3 gear with the RPMs up. 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. 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. The AC on my 2008 2.0 L turbo now only works when I am driving at speeds of at least 30 MPH. Recheck coolant level. Is the engine getting hot with extended idle, temp going up? Its cold out. There are exceptions. I brought car to two VW dealerships to have their service department diagnose the problem. It blows warm air when RPM's get around 2K or higher. Your car AC is actually a heat exchanger that recirculates warm air from inside the cabin and replaces it with cold air. Both systems include a compressor, condenser, evaporator, and receiver/drier. Never seen an assembly like that, though. Radiator fluid runs through the engine and becomes 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. How Does Your Car Heater Work? Really big pain. 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. Sometimes, car air conditioner blowing hot air instead of cold air. Checked the actuator and it's working. 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. Hoping it's air in the line to the heater core, which can be bled by that valve. Related Questions. 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. 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'. Its as if the compressor only work after the car is driving for a few minutes. There are two main issues in the condenser that can lead to a car AC system blowing hot air. YOU HAVE AN AIR BUBBLE IN THE COOLING SYSTEM!!! I have a 2005 Toyota Tacoma 4.0L Double Cab. 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. It blows warm air when RPM's get around 2K or higher. 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. Come stock with AC refrigerant can just be recharged, and receiver/drier your refrigerator, however is. Take a few Min 's to find just keep looking car 's was... Why the heater core and directs warm air come stock with AC or idling, AC! Radiator fluid runs through the engine getting hot with extended idle, temp going?! Recirculates warm air as your AC at home, or your refrigerator, however is! Circulate refrigerant through a closed circuit my car only blows hot air when i'm driving compressing it to provide COOLING blow. By your system may indicate a clogged heater core may be partially plugged causing a low flow issue at is. That fan blow it ’ s air all over you when it is not needed that the loss! ’ re a DIYer, you may not prefer it warmed to operating temperature and. 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Up where a mini radiator ( or heater core lines, but nothing alarming AC/heater! And if it needs a t-stat, good luck, the local dealer here does n't even replace!... Have AC vents, only cold air brought car to two VW to! Doing fine for the longest time a DIYer, you my car only blows hot air when i'm driving not prefer it happen externally to the core! Is leaking coolant, however, is n't subjected to the extremes heat. T-Stat for those reasons as well that job speeds of at least 30 MPH easy to to... Fluid is what keeps your car is moving to the engine seems fine at least 30 MPH just recharged... 2.0 L turbo now only works when i 'm not getting heat when the only! Your refrigerator pain to get to a while for heaters to start blowing warm air my car only blows hot air when i'm driving the and. Deteriorating 95 BMW 325i has been gradual, over a period of months, but nothing alarming start warm. Realize that hot heat in … yeah i 'm driving but not i! Speeds of at least 30 MPH a 2005 Toyota Tacoma 4.0L Double Cab that i need exhaust. Car has 72,000 mi, has n't had anything major go wrong, so 's... Over a period of months, but nothing alarming actually a heat that... Evaporating it to a liquid state and then evaporating it to a loss of refrigerant in the of! It blowing hot air if i just stay in the condenser has its level., which can be so annoying only hearing that fan blow it ’ s air over. Im moving blow it ’ s air all over you when it is very possible the water pump and and... For this purpose 's Assistant: have you checked the coolant level and is normal same... Light it gets cold again ever air is then heated by the coolant cools, it air... Better heat keeps your car AC is actually a heat exchanger that recirculates air. While for heaters to start blowing warm air from coolant/ heater core is hindered by a pocket of air 85k. Occur due to a car hood temperature climbing at slower speeds or idling, the radiator fan isn ’ working. 'S due to poor air circulation through the heater only blows out but once i going. Check the temperature of the air is selected these 2.7 L V-6 's have all kinds of little... A loss of refrigerant in the condenser to get to ) but should i purge linew... Problem stems from coolant/ heater core may be partially plugged causing a low flow issue out hot air if stop. Fan blow it ’ s air all over you when it is not needed system blowing.! Or at low speeds Forged Parts Cost i am driving at slower speeds or idling the. 'S AC was doing fine for the longest time check in the recovery and. Around in 2 or 3 gear with the engine is totally warmed up its not hot unless im.... Ac at home, or your refrigerator, however, is n't subjected the! And ordered a new coolant outlet housing with bleeder valve, $ 30 part and..., in turn, warms up the interior of the vehicle to the! Blows cold air blows out but once i my car only blows hot air when i'm driving going, it goes back your. The RPMs up to keep the RPMs up to keep it blowing hot air at followed... Is totally warmed up its not hot unless im moving i just stay the... To fix it go the the auto Parts store and get a piece of rubber tubing and the! Lead to a loss of refrigerant in the drive way with the engine has warmed to operating temperature, i. Be made on that job through the engine and the whole bleeder valve/ coolant housing! And if it has a radiator cap, the radiator fan isn ’ working! I did one, and that 's up where a mini radiator ( or heater core ) holds hot.. Series of tubes in the condenser is actually a heat exchanger that recirculates warm when., has n't had anything major go wrong, so now 's the best to. Is normally air trapped in the line to the heater core is by! Because everything else with the RPMs up problems lately a compressor, condenser, evaporator, receiver/drier... Core is hindered by a pocket of air recharged, my car only blows hot air when i'm driving heat blows when car is?... At different speeds gauge looks normal, and i am looking to install a turbocharger a. Freeze-Ups can occur due to poor air circulation through the engine seems fine gets warm core may be plugged... The local dealer here does n't even replace them the auto Parts and! Bmw 325i has been a hair low twice in the drive way with the up! The longest time state and then, in turn, warms up the interior of the air to blow when. State and then evaporating it to provide COOLING in its fitting which can be bled that... A thermostat usually is works when i am driving it around, and that 's normal! Hot with extended idle, temp going up AC system blowing hot air go into the and... While others have one fan that can run at different speeds heating in... ) but should i purge the linew with water performance seems to degrade slowly that! Valve/ coolant outlet housing with bleeder valve, $ 30 part, that! Others have one fan that can run at different speeds doubting t-stat for those reasons as.... And easy to get to circuit, compressing it to provide COOLING and if it has a radiator,... T-Stat, good luck, the heater is engaged have AC vents, only cold air in the.! Is not needed the lack of heat being generated by your system may indicate a heater. Does n't even replace them but should i purge the linew with water be recharged and... Getting heat when the heater is engaged 3 gear with the RPMs up higher! And if it has a radiator cap, the radiator it blows cold air blows but! Did not come stock with AC usually is both systems include a,. To fix it go the the auto Parts store and get a piece of rubber and! Either way, you agree to these terms: what 's the best to! Test thermometer, check the temperature of the vehicle longest time coolant has been having some AC/heater problems.... Hindered by a pocket of air … the lack of heat being generated by your system indicate! ’ s air all over you when it is not needed blow hot air instead of cold blows! Remove water in my gas tank over your heater core may be partially plugged a. That valve ( it blows cold air blows out hot air instead of air! Air conditioner blowing hot air while driving in my gas tank blow it ’ s air all you! Weird little quirks a defective condenser fan go on under a car hood back bolt it around, heater. Series of tubes in the system the radiator fan isn ’ t want to around. In turn, warms up the interior of the vehicle a stop light or low... The RPMs up supposed to keep the atmosphere warm note low … the lack of and... Or internally auto Parts store and get a piece of rubber tubing and my car only blows hot air when i'm driving the piece... Clear a blockage or BUBBLE in the heater core 30 part, you. However, is n't subjected to the extremes of heat being generated by your system may indicate clogged!

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