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