2011 TDI JSW 6m 129,000 miles Does anybody have any idea why my AC is cold on the right side of car (2vents) but the drivers side vents blow warm. Heater working but only blows out front vents. no water in passenger footwell so assume heater … I then turned my side to "LO" and in doing this the fan turns on high and the air was so hot coming out of the vent that I couldn't keep my hand in front on it. sounds like a faulty outside temp sensor. If the coolant level should drop as the thermostat opens, top it up as necessary. Then I had heat. The thermostat should open up as your engine reaches operating temperature. An air conditioning system, using several components, includes a compressor to pressurize a chemical called freon, and drastically lower its temperature. If the fan runs all the time, including from a cold start, you might have this problem. Turned it to low and still nothing. An expert who has achieved level 3 by getting 1000 points. The heater valve is the one that let the hot coolant from the engine to the heater core inside the car so the fan can blow hot air to inside of the car (then you have heat). Heater core internal passages: The heater core is like a miniature radiator built into the dashboard. There could even be a puddle of liquid under the front of the vehicle. Solution: Getting the thermostatic switch replaced should resolve the problem. If your low on fluid at all the heater will not get hot water to it to work properly .. this is a good start if it has been working in the past ... and thanks jerry. If you have an older car, check the hoses (with the car off) for a “spongy” feeling — this can mean they’re on their last legs. My heater is blowing cold air when idle? Stephen has been an automotive enthusiast since childhood, owning some of his vehicles for as long as 40 years, and has raced open-wheel formula cars. A lack of heat can be a symptom of a much larger problem. A problem in your heating system can usually be traced to one or more of the systems that produce and distribute the heat to the interior of the vehicle. Audi A6 AC blowing warm air & temp,gauge rising warning light says check coolant but coolant is full 1 Answer. They did flush the whole system out. Radiator cap: Your radiator cap regulates the pressure in the cooling system, acting as an escape valve if the pressure gets too high. Have someone turn the temperature up and down while you confirm that the valve is closing and opening to allow hot water into the heater radiator. Solution: Just replace the radiator cap with a new one. Audi A3 8p only blowing cold air Hi all, I have a 2004 Audi A3 2.0 FSI with 78k miles. The heater blowing cold air can be caused by two different types of problems. You start it up and hit the heater. This makes the engine warm up more quickly and reduces emissions. Vacuum hose could have came off there or behind climate control box behind dashboard. If this doesn’t fix it, a replacement heater core may be needed. 2001 Audi A6, Jun 01, 2017 | That heated coolant then runs through the radiator, where the heat dissipates. 2002 Audi A4, May 29, 2015 | The far right vent will blow cold. A defective thermostatic switch could make the fan run continuously, reducing the coolant temperature to the point where you can’t get enough heat into the interior. 2004 audi a8 heater blowing cold air - Answered by a verified Audi Mechanic. When you change the heat system to read deg C, the outside air temp will also read deg C. To change between F & C press and hold the recirc button on the heat control and then press the + on the drivers side. Step 2: Please assign your manual to a product: By entering the Fixya site you declare that you have read and agreed to its Terms. Water pump: The water pump circulates the coolant throughout the engine and heater core. When the engine is fully warmed up, put the cap back on and take a drive to see if the heat output has returned. as above really my heater just blows cold/luke warm air on hot setting and even if you put the front windscreen dimist button still no hot air..: ... By pflangan in forum Audi A6 - C6 Forum - 2005 - 2010 Replies: 2 Last Post: 14-06-2011, 06:38 PM. A6 C7 Saloon 4G2, 4GC 11/2010 - 09/2018 Car body type: Saloon; A6 C7 Avant 4G5, 4GD 05/2011 - 09/2018 Car body type: Estate; A6 C7 Allroad 4GH, 4GJ 01/2012 - … HVAC Unit. Another here with the same fault. A bad radiator should be attended to promptly. And while we’re on the subject, it’s also important to keep your coolant fresh and clean. Heater core exterior: The heat-radiating fins on the outside of your heater core could also be clogged with debris that makes its way in from the outside air intake at the base of the windshield. One side is blowing out burning hot air and the other is blowing out freezing cold air. – Audi A8 D3 AC system: As I understand while having this experience, the AC system blows cold or hot air whenever it feels like last few months and it’s totally out, the ECON settings was forced to ON = AC OFF. people viewed this question. 2003 Audi A6, May 04, 2011 | Thanks Jerry! The surrounding air then also cools, and in turn keeps you from melting. Engine overheats and heater blowing cold air You have air trapped in system, change thermostat, bleed air from system, let it run hot while adding coolant with blower full blast on all front and rear heaters. After reading the last post, I found a bleeder on one of the hoses going to the heater core. I have a 2004 Allroad 2.7t, I let the car warm up enough, turn it on with the remote start about 30 minutes before, it's about -20c here. Heater valves: These valves control the heat output of the heater core. You have air trapped in system , change thermostat , bleed air from system , let it run hot while adding coolant with blower full blast on all front and rear heaters . If you don’t, the helpful additives in the coolant will wear out and other particles will get into it, potentially clogging passages in the heating system. These are: Coolant level: If your coolant level is low, your heater core may not be getting enough warmed coolant through it to produce adequate heat. And you wait — and wait — but the heater just blows cold air. I think this valve is vacuum operated. Its a 1997 audi a6 sedan quattro. Blower fan: If your heater’s blower fan isn’t working, you won’t get much heat from the heater core to circulate into your vehicle. I've just been done over after buying a 2004 Audi A4 Avant tdi sport from private seller. Replacement may be necessary if it’s not working right. He follows and writes about the global automotive industry, with an eye on the latest vehicle technologies. I had no heat after replacing the water pump on my 96 Audi A6 quattro. Solution: Your mechanic might be able to repair the radiator, or it may need to be replaced. But its narrow passages can become clogged from rust particles or other contaminants that can build when the coolant doesn’t get replaced or the cooling system doesn’t get flushed for a long time. Add, Sep 09, 2015 | Rest easy knowing you're covered by a local warranty. hot and cold - the mid vents are controlled seperately so you can have hot and cold. A lack of heat can be a symptom of a much larger problem. Went back each time switching a different part. If it sticks in the open position, there will be insufficient pressure in the system, and the coolant will not get hot enough, reducing the heater’s output. 2001 Audi A6, Jan 23, 2013 | Either way, don’t wait long to get it fixed — losing coolant is an easy way to overheat and destroy your engine. If the level is low due to a leak, track down the source and get it repaired. This sensor is likely causing your both issues as the voltage drop or resistance is not in the range the ecu expects. 1999 Audi A6, Dec 05, 2013 | Check your owner's manual for the recommended replacement interval, and ask your mechanic whether your cooling system needs a change and a flush. No heat to feet or defrost. Air vents blow only Hot Air. An expert whose answer got voted for 100 times. In no time flat your Audi A6 will be breathing more cool air and burning rubber. 1996 Audi A4, Mar 10, 2017 | Find all the top-rated and best Audi A6 Cold Air Intakes here. The problem is that when im driving it blows hot air but when im stopped at a light it blows cold. Thanks Jerry! Have someone turn the temperature up and down while you confirm that the valve is closing and opening to allow hot water into the heater radiator. 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