By using this site, you agree to these terms: What's the best way to remove water in my gas tank? 1. Anyone have any idea whats … The first is a blockage anywhere in the series of tubes in the condenser. 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. And that thermostat is a HUGE pain to get to. 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. Once the engine has warmed to operating temperature, and I am driving it around, the heater works great. It blows warm air when RPM's get around 2K or higher. Looking for the thermostat I found a weird piece on top of engine called a coolant outlet housing, has a bleeder valve on top. YOU HAVE AN AIR BUBBLE IN THE COOLING SYSTEM!!! 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. Recheck the coolant level, again. What is wrong with it? It means that the refrigerant loss has been gradual, over a period of months, and that's fairly normal. I have checked the coolant level and is normal. 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. I can see where the lines go into the firewall (tough to get to)but should I purge the linew with water? What could the problem be? Temp stays normal. Your car AC is actually a heat exchanger that recirculates warm air from inside the cabin and replaces it with cold air. When the coolant cools, it goes back to your engine and the whole process starts over. Your refrigerator, however, isn't subjected to the extremes of heat and vibration that go on under a car hood. Its cold out. Like the whole bleeder valve/ coolant outlet housing that's up where a thermostat usually is. Here's Your Basic Car Maintenance Schedule, Diagnostic Tips When Air Conditioning Isn’t Working, Common A/C and Fuel Efficiency Myths Debunked. I would pull the two heater core hoses off the back of the head and try flushing the heater core out by … 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. 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. Now if the radiator fan isn’t working properly, you should see your engine temperature climbing at slower speed also. How Does Your Car Heater Work? It could be a faulty radiator cap or it could mean there’s a leak somewhere in the system. 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 … Each of these problems has its own level of gravity thus different costs of repairing. I'm not getting heat when the heater is engaged. Coolant level is good. 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. 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's easy after you get the plenum unbolted and raised to access the back bolt. 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. 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! 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. 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. can someone help? (it blows cold air in idle) Firstly, a thermostat that opens quicker will not give you better heat. Radiator fluid runs through the engine and becomes hot. Its as if the compressor only work after the car is driving for a few minutes. Tried to bleed air from coolant/ heater core lines, but the valve just spins in its fitting. And you need to know how to solve the problem immediately. Low Refrigerant Levels. 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. It was added by the dealer. If you notice that your thermostat gauge stays on the “C” even after the … 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. 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. The temp stays normal in not cold or hot. What about the water pump? This vehicle MIGHT have a bleeder for this purpose. Is the engine getting hot with extended idle, temp going up? 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. 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. My car has 165 miles. My car heater works when I'm driving but not when I'm in idle. I usually have to keep the RPMs up to keep it blowing hot. When driving at slower speeds or idling, the AC blows warm air. Using a test thermometer, check the temperature of the air being discharged at the HVAC housing floor outlets. Could be water pump. Replace? Both systems include a compressor, condenser, evaporator, and receiver/drier. 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. Many cars are equipped with two radiator fans, while others have one fan that can run at different speeds. The air is then heated by the coolant and then, in turn, warms up the interior of the vehicle. The lack of heat being generated by your system may indicate a clogged heater core. The AC in your car works in the exact same fashion as your AC at home, or your refrigerator. Any degree of blockage in the system can lead to the condenser not being able to execute its … So why is blowing warm air inside the car? Car Blows Cold Air When Stopped, But Blows Hot Air While Driving. 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. 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. Most cars do not have AC vents, only climate control vents. 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. 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. Well, you might call up a car mechanic and solve such a car ac cooling problem for the price of a few hundred bucks. Anyone know why the heater only works when the car is moving? Note Low … A defective condenser fan. I have checked the coolant level and is normal. A car heater blowing cold air could be a symptom of the failure of the heating unit.. It may take a few Min's to find just keep looking. Tried to bleed air from coolant/ heater core lines, but the valve just spins in its fitting. You're right about the t-stat. 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. It blows cold air when at a stop light or at low speeds. 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. My car has an automatic transmission. Recently had the fan clutch, water pump and thermostat and belt changed. Your car AC is actually a heat exchanger that recirculates warm air from inside the cabin and replaces it with cold air. Tags: Cold Air, Hot Air. Hoping it's air in the line to the heater core, which can be bled by that valve. Which means that they blow what ever air is selected. A fan blows over your heater core and directs warm air into the cabin. This is the reason that it takes a while for heaters to start blowing warm air. The cooling fan in the condenser is the first thing that you should look … 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. When sitting idle, only cold air blows out but once I get going, it gets warm. to fix it go the the auto parts store and get a piece of rubber tubing and put the two piece's back together.. 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'. No leaks I can find. When driving at slower speeds or idling, the AC blows warm air. The temp stays normal in not cold or hot. It blows cold air when at a stop light or at low speeds. What Will a Cabin Air Filter Replacement Cost. This can happen externally to the engine or internally. Your heater core may be partially plugged causing a low flow issue. Your car AC is actually a heat exchanger that recirculates warm air from inside the cabin and replaces it with cold air. So ill drive around in 2 or 3 gear with the RPMs up. 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. Checked the actuator and it's working. No temp/ overheating probs, no strange noises/ leaks, no warning lights. I want the air to blow hot when stopped. Both hoses to heater core are warm. 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. Or is it more likely to be a blocked heater core, or bad thermostat? In most cases, it's due to a loss of refrigerant in the system. 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. If I stop at a light it gets cold again. In most cases, this means that your refrigerant can just be recharged, and you'll be on your way again. 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. I know this is not a good engine for turbo but I might This vital fluid is what keeps your car from overheating. I brought car to two VW dealerships to have their service department diagnose the problem. Or blow them out with a compressor maybe? Recheck coolant level. But if you’re a DIYer, you may not prefer it. There are two main issues in the condenser that can lead to a car AC system blowing hot air. Really big pain. The flow of water through the heater core is hindered by a pocket of air. My slowly deteriorating 95 BMW 325i has been having some AC/heater problems lately. I have changed many of those housings because they separate and leak. Ever clear a blockage or bubble in the heater core? Car has 72,000 mi, hasn't had anything major go wrong, so now's the time I guess. What happened? In most cases, it's due to a loss of refrigerant in the system. There are exceptions. There could be several reasons behind this problem. 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. You don’t pay it too much attention because it’s summer and you enjoy the convenience of the burst of 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. 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. but if I just stay in the drive way with the engine on the air will only blow hot air. Think the problem stems from coolant/ air circulation to the heater core, because everything else with the engine seems fine. Never seen an assembly like that, though. 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. Can't charge what it is worth! Both systems circulate refrigerant through a closed circuit, compressing it to a liquid state and then evaporating it to provide cooling. This means that they blow what ever air is then heated by the coolant cools it! A light it gets warm blow it ’ s air all over you when it is not needed normal. 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