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. The first is a blockage anywhere in the series of tubes in the condenser. 2012 Jeep liberty blowing cold air as well as heater when heater is turned on 3 Answers. Your car AC is actually a heat exchanger that recirculates warm air from inside the cabin and replaces it with cold air. No leaks I can find. This vehicle MIGHT have a bleeder for this purpose. How Does Your Car Heater Work? I'm not getting heat when the heater is engaged. If you notice that your thermostat gauge stays on the “C” even after the … 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. So your car's AC was doing fine for the longest time. 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. 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. Think the problem stems from coolant/ air circulation to the heater core, because everything else with the engine seems fine. Recently had the fan clutch, water pump and thermostat and belt changed. Recheck the coolant level, again. 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. The AC in your car works in the exact same fashion as your AC at home, or your refrigerator. Tags: Cold Air, Hot Air. When the coolant cools, it goes back to your engine and the whole process starts over. 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. It's just no money to be made on that job. 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. Sometimes, freeze-ups can occur due to poor air circulation through the condenser. Temp gauge looks normal, and heat blows when car is moving. 1. Radiator fluid runs through the engine and becomes hot. This can be so annoying only hearing that fan blow it’s air all over you when it is not needed. 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. 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. This is the reason that it takes a while for heaters to start blowing warm air. In most cases, it's due to a loss of refrigerant in the system. Dysfunctional Thermostat. IMO. When driving at slower speeds or idling, the AC blows warm air. Low Refrigerant Levels. yeah i'm doubting t-stat for those reasons as well. But if you’re a DIYer, you may not prefer it. This can happen externally to the engine or internally. It could be a faulty radiator cap or it could mean there’s a leak somewhere in the system. Or is it more likely to be a blocked heater core, or bad thermostat? Either way, you don’t want to drive around with a vehicle that is leaking coolant. Hoping it's air in the line to the heater core, which can be bled by that valve. 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. 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 would pull the two heater core hoses off the back of the head and try flushing the heater core out by … Cool air at idle followed by hot air at acceleration is normally air trapped 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. 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. If I stop at a light it gets cold again. My heater only blows out hot air if i am driving. 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. So ill drive around in 2 or 3 gear with the RPMs up. 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. Coolant level is good. It blows cold air when at a stop light or at low speeds. 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. Recheck coolant level. Air flows fine. But if you’re a DIYer, you may not prefer it. 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. 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. My car has an automatic transmission. Out of Coolant. Car has 72,000 mi, hasn't had anything major go wrong, so now's the time I guess. Or blow them out with a compressor maybe? There are exceptions. 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. I had a 1980 Ferrari that did not come stock with AC. Sometimes, car air conditioner blowing hot air instead of cold air. A defective condenser fan. I want the air to blow hot when stopped. 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. It was added by the dealer. Replace? Each of these problems has its own level of gravity thus different costs of repairing. You don’t pay it too much attention because it’s summer and you enjoy the convenience of the burst of cool air. The AC on my 2008 2.0 L turbo now only works when I am driving at speeds of at least 30 MPH. Coolant has been a hair low twice in the last few months, but nothing alarming. Your car AC is actually a heat exchanger that recirculates warm air from inside the cabin and replaces it with cold air. The temp stays normal in not cold or hot. 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. The cooling fan in the condenser is the first thing that you should look … A car heater blowing cold air could be a symptom of the failure of the heating unit.. 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. Has there been any leaking from the hoses? My slowly deteriorating 95 BMW 325i has been having some AC/heater problems lately. 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. Hey guys, 2011 Xterra with 85k on it. I usually have to keep the RPMs up to keep it blowing hot. Temp gauge looks normal, and heat blows when car is moving. Coolant level is good. Sometimes, car air conditioner blowing hot air instead of cold air. I brought car to two VW dealerships to have their service department diagnose the problem. 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'. Which means that they blow what ever air is selected. Car Blows Cold Air When Stopped, But Blows Hot Air While Driving. In most cases, it's due to a loss of refrigerant in the system. I have changed many of those housings because they separate and leak. It is very possible the water pump impeller is defective. 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. I can see where the lines go into the firewall (tough to get to)but should I purge the linew with water? Can't charge what it is worth! 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. There could be several reasons behind this problem. Using a test thermometer, check the temperature of the air being discharged at the HVAC housing floor outlets. I brought car to two VW dealerships to have their service department diagnose the problem. It may take a few Min's to find just keep looking. Went ahead and ordered a new coolant outlet housing with bleeder valve, $30 part, and easy to get to. but if I just stay in the drive way with the engine on the air will only blow hot air. And that thermostat is a HUGE pain to get to. to fix it go the the auto parts store and get a piece of rubber tubing and put the two piece's back together.. can someone help? YOU HAVE AN AIR BUBBLE IN THE COOLING SYSTEM!!! What Will a Cabin Air Filter Replacement Cost. I have checked the coolant level and is normal. When driving at slower speeds or idling, the AC blows warm air. The lack of heat being generated by your system may indicate a clogged heater core. It blows warm air when RPM's get around 2K or higher. What about the water pump? Your car AC is actually a heat exchanger that recirculates warm air from inside the cabin and replaces it with cold 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. Is there an esy way to test the water pump? A defective condenser fan. What could the problem be? Ever clear a blockage or bubble in the heater core? It's easy after you get the plenum unbolted and raised to access the back bolt. 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. Note Low … Its cold out. Looking for the thermostat I found a weird piece on top of engine called a coolant outlet housing, has a bleeder valve on top. In most cases, it's due to a loss of refrigerant in the system. Could be water pump. I think it’s possible that you’ve got air getting in your “closed” cooling system (and coolant getting out). If it needs a T-stat, good luck, the local dealer here doesn't even replace them! The heating system in your car is supposed to keep the atmosphere warm. It blows cold air when at a stop light or at low speeds. This vital fluid is what keeps your car from overheating. Never seen an assembly like that, though. Anyone have any idea whats … Checked the actuator and it's working. Tried to bleed air from coolant/ heater core lines, but the valve just spins in its fitting. Something is wrong when that does not happen. Your heater core may be partially plugged causing a low flow issue. So why is blowing warm air inside the car? What happened? The flow of water through the heater core is hindered by a pocket of air. I have checked the coolant level and is normal. I have a 2005 Toyota Tacoma 4.0L Double Cab. My car has 165 miles. Here's Your Basic Car Maintenance Schedule, Diagnostic Tips When Air Conditioning Isn’t Working, Common A/C and Fuel Efficiency Myths Debunked. 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 … 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. or is it air flow problem. Tried to bleed air from coolant/ heater core lines, but the valve just spins in its fitting. I did ONE, and that's it for me!! No temp/ overheating probs, no strange noises/ leaks, no warning lights. 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. Temp stays normal. Both hoses to heater core are warm. Looking for the thermostat I found a weird piece on top of engine called a coolant outlet housing, has a bleeder valve on top. Is the engine getting hot with extended idle, temp going up? Did some research, and I guess these 2.7 L V-6's have all kinds of weird little quirks. 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. What is wrong with it? I was told that I need replace exhaust manifold gasket because of oil leak, no o. 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 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 your car AC performance seems to degrade slowly, that's probably a best-case scenario for you. It then runs through piping to your cabin, where a mini radiator (or heater core) holds hot coolant. 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. 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 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. Anyone know why the heater only works when the car is moving? Like the whole bleeder valve/ coolant outlet housing that's up where a thermostat usually is. And you need to know how to solve the problem immediately. 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.

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