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

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