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. The cooling fan in the condenser is the first thing that you should look … Hey guys, 2011 Xterra with 85k on it. And you need to know how to solve the problem immediately. (it blows cold air in idle) Firstly, a thermostat that opens quicker will not give you better heat. 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'm not getting heat when the heater is engaged. 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). Something is wrong when that does not happen. Ever clear a blockage or bubble in the heater core? A fan blows over your heater core and directs warm air into the cabin. 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. to fix it go the the auto parts store and get a piece of rubber tubing and put the two piece's back together.. In most cases, it's due to a loss of refrigerant in the system. I had a 1980 Ferrari that did not come stock with AC. 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. What Will a Cabin Air Filter Replacement Cost. In most cases, this means that your refrigerant can just be recharged, and you'll be on your way again. 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 … The most common cause of hot air coming from car AC vents is low levels … The AC on my 2008 2.0 L turbo now only works when I am driving at speeds of at least 30 MPH. Air flows fine. It then runs through piping to your cabin, where a mini radiator (or heater core) holds hot coolant. It's easy after you get the plenum unbolted and raised to access the back bolt. The lack of heat being generated by your system may indicate a clogged heater core. Or is it more likely to be a blocked heater core, or bad thermostat? How Does Your Car Heater Work? I would pull the two heater core hoses off the back of the head and try flushing the heater core out by … I have a 2005 Toyota Tacoma 4.0L Double Cab. The flow of water through the heater core is hindered by a pocket of air. There are two main issues in the condenser that can lead to a car AC system blowing hot air. It blows warm air when RPM's get around 2K or higher. What happened? Your car AC is actually a heat exchanger that recirculates warm air from inside the cabin and replaces it with cold air. Has there been any leaking from the hoses? Your heater core may be partially plugged causing a low flow issue. Recently had the fan clutch, water pump and thermostat and belt changed. 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. I did ONE, and that's it for me!! 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. 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. 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. Dysfunctional Thermostat. Tried to bleed air from coolant/ heater core lines, but the valve just spins in its fitting. Tags: Cold Air, Hot Air. A defective condenser fan. Cool air at idle followed by hot air at acceleration is normally air trapped in the system. And you need to know how to solve the problem immediately. IMO. 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. Checked the actuator and it's working. It could be a faulty radiator cap or it could mean there’s a leak somewhere in the system. 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… 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. Its as if the compressor only work after the car is driving for a few minutes. or is it air flow problem. So your car's AC was doing fine for the longest time. It was added by the dealer. My car has 165 miles. YOU HAVE AN AIR BUBBLE IN THE COOLING SYSTEM!!! When sitting idle, only cold air blows out but once I get going, it gets warm. The temp stays normal in not cold or hot. 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. It blows cold air when at a stop light or at low speeds. Note Low … Now if the radiator fan isn’t working properly, you should see your engine temperature climbing at slower speed also. So ill drive around in 2 or 3 gear with the RPMs up. 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. Your car AC is actually a heat exchanger that recirculates warm air from inside the cabin and replaces it with cold air. yeah i'm doubting t-stat for those reasons as well. 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. 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. 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 blow them out with a compressor maybe? Check in the recovery bottle and if it has a radiator cap, the radiator. I brought car to two VW dealerships to have their service department diagnose the problem. So why is blowing warm air inside the car? Mechanic's Assistant: Have you checked the coolant level? This vital fluid is what keeps your car from overheating. Anyone have any idea whats … Can't charge what it is worth! My car has an automatic transmission. There could be several reasons behind this problem. Both systems circulate refrigerant through a closed circuit, compressing it to a liquid state and then evaporating it to provide cooling. 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. Well, you might call up a car mechanic and solve such a car ac cooling problem for the price of a few hundred bucks. 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. 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 stays normal. Each of these problems has its own level of gravity thus different costs of repairing. The heating system in your car is supposed to keep the atmosphere warm. Did some research, and I guess these 2.7 L V-6's have all kinds of weird little quirks. I have checked the coolant level and is normal. Sometimes, freeze-ups can occur due to poor air circulation through the condenser. Related Questions. 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'. Tried to bleed air from coolant/ heater core lines, but the valve just spins in its fitting. 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. 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 have changed many of those housings because they separate and leak. The AC in your car works in the exact same fashion as your AC at home, or your refrigerator. 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. Even if the engine is totally warmed up its not hot unless im moving. I know this is not a good engine for turbo but I might but if I just stay in the drive way with the engine on the air will only blow hot air. If I stop at a light it gets cold again. This can be so annoying only hearing that fan blow it’s air all over you when it is not needed. No leaks I can find. It is very possible the water pump impeller is defective. Temp gauge looks normal, and heat blows when car is moving. Anyone know why the heater only works when the car is moving? Any degree of blockage in the system can lead to the condenser not being able to execute its … It means that the refrigerant loss has been gradual, over a period of months, and that's fairly normal. Winter rolls around, and you quickly realize that hot heat in … In most cases, it's due to a loss of refrigerant in the system. 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. It may take a few Min's to find just keep looking. The temp stays normal in not cold or hot. Well, you might call up a car mechanic and solve such a car ac cooling problem for the price of a few hundred bucks. can someone help? 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. 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. Both systems include a compressor, condenser, evaporator, and receiver/drier. This is the reason that it takes a while for heaters to start blowing warm air. 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. In most cases, it's due to a loss of refrigerant in the system. What could the problem be? There are exceptions. 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. 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. Both hoses to heater core are warm. Never seen an assembly like that, though. 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. This can happen externally to the engine or internally. What about the water pump? I was told that I need replace exhaust manifold gasket because of oil leak, no o. Could be water pump. My car heater works when I'm driving but not when I'm in idle. 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