Radiator fluid runs through the engine and becomes hot. Coolant level is good. Well, you might call up a car mechanic and solve such a car ac cooling problem for the price of a few hundred bucks. My slowly deteriorating 95 BMW 325i has been having some AC/heater problems lately. 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. 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. Tried to bleed air from coolant/ heater core lines, but the valve just spins in its fitting. 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. My car has an automatic transmission. 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. A defective condenser fan. Or blow them out with a compressor maybe? My heater only blows out hot air if i am driving. Any degree of blockage in the system can lead to the condenser not being able to execute its … 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. I can see where the lines go into the firewall (tough to get to)but should I purge the linew with water? There could be several reasons behind this problem. Could be water pump. If you notice that your thermostat gauge stays on the “C” even after the … Note Low … Can't charge what it is worth! 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. Your refrigerator, however, isn't subjected to the extremes of heat and vibration that go on under a car hood. Both hoses to heater core are warm. Your car AC is actually a heat exchanger that recirculates warm air from inside the cabin and replaces it with cold air. What about the water pump? The lack of heat being generated by your system may indicate a clogged heater core. 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. But if you’re a DIYer, you may not prefer it. 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. Both systems include a compressor, condenser, evaporator, and receiver/drier. It means that the refrigerant loss has been gradual, over a period of months, and that's fairly normal. Recently had the fan clutch, water pump and thermostat and belt changed. 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. Coolant has been a hair low twice in the last few months, but nothing alarming. Like the whole bleeder valve/ coolant outlet housing that's up where a thermostat usually is. I usually have to keep the RPMs up to keep it blowing hot. The temp stays normal in not cold or hot. I have checked the coolant level and is normal. Is there an esy way to test the water pump? And you need to know how to solve the problem immediately. Checked the actuator and it's working. Anyone know why the heater only works when the car is moving? It was added by the dealer. 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. Ever clear a blockage or bubble in the heater core? But if you’re a DIYer, you may not prefer it. Sometimes, freeze-ups can occur due to poor air circulation through the condenser. 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). I would pull the two heater core hoses off the back of the head and try flushing the heater core out by … Winter rolls around, and you quickly realize that hot heat in … 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 vital fluid is what keeps your car from overheating. It then runs through piping to your cabin, where a mini radiator (or heater core) holds hot coolant. can someone help? Temp gauge looks normal, and heat blows when car is moving. 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. No temp/ overheating probs, no strange noises/ leaks, no warning lights. 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. but if I just stay in the drive way with the engine on the air will only blow hot air. Most cars do not have AC vents, only climate control vents. I brought car to two VW dealerships to have their service department diagnose the problem. 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. So your car's AC was doing fine for the longest time. The AC in your car works in the exact same fashion as your AC at home, or your refrigerator. 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. Once the engine has warmed to operating temperature, and I am driving it around, the heater works great. Anyone have any idea whats … I have changed many of those housings because they separate and leak. And you need to know how to solve the problem immediately. Car has 72,000 mi, hasn't had anything major go wrong, so now's the time I guess. Did some research, and I guess these 2.7 L V-6's have all kinds of weird little quirks. My car has 165 miles. You're right about the t-stat. 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. When driving at slower speeds or idling, the AC blows warm air. A car heater blowing cold air could be a symptom of the failure of the heating unit.. 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. Temp stays normal. Well, you might call up a car mechanic and solve such a car ac cooling problem for the price of a few hundred bucks. How Does Your Car Heater Work? Coolant level is good. I want the air to blow hot when stopped. I was told that I need replace exhaust manifold gasket because of oil leak, no o. A fan blows over your heater core and directs warm air into the cabin. The flow of water through the heater core is hindered by a pocket of air. 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 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'. It blows warm air when RPM's get around 2K or higher. 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. There are exceptions. Looking for the thermostat I found a weird piece on top of engine called a coolant outlet housing, has a bleeder valve on top. yeah i'm doubting t-stat for those reasons as well. 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.