Question about 1996 Audi A4

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96 audi a4 heater blows cold air

I can't get any heat, only cold air. I flushed the heater core and there was no blockage. The temp gauge reads normal. Is there a valve controlling the water flow to the core, and if so where is it located? Any other thoughts? Thanks

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  • SC99 Jan 17, 2009

    The temp gauge always displays in the normal range. Also, a garden hose runs water easily thru the heater core. Only one heater hose gets hot when the engine is running. This is why I thought I might have a stuck heater valve, but I can't verify one exists for the '96 A4. I would suspect a bad water pump or thermostat if I was having water temp issues, but the rest of the cooling system is fine. Any additional thoughts are appreciated. Thanks for the reply.

  • ewalker1970 Jan 26, 2009

    I have a 98 a4 2.8. It blows cold air with the heat on. One of the hose entering the core is hot and the other is cold. I took the hoses off and blew air through the core with no problem.

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You have air in the system!! you have to unbolt the filler tank and lift it 5 inch higer first. then loose the right hose on the heater core( this hose have and hole to bleed the system) and then put antifreeze until the antifreeze will go out of the hole then re install the hose to the heater core, then ajust the level correcty
have fun
jean-martin

Posted on Feb 05, 2009

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Are you sure the thermostat is working efficiently? If your getting a little heat when the car is idleing in traffic, but this goes when you start driving again, it suggests the t'stat is stuck open, therefore no temperature can build. When you flushed the system, could you confirm the flow of water through the heater radiator? Was it passing through easily or just a dribble on the point of exit? is there any heat delivered from any of the other heater settings, e.g floor/screen/face vents? If you can get heat from one of these positions it may suggest a heater box issue. There is of course a slim possiblity that the impeller on the engine water pump may have become loose and ineffective. See how you get on. Good luck

Posted on Jan 17, 2009

  • chalkymon
    chalkymon Jan 17, 2009

    After reading your reply only one more thought springs to mind. You mentioned how water flowed freely through the heater when you flushed it and that now the engine is up and running how only one of the hoses gets hot. If the second hose from the heater rad remains cold, it might possibly be you have an air blockage due to the system not having been bled correctly, this is not an uncommon symptom and it affects all makes and models. One thing to try when the engine is started but not up to normal working temperature I hasten to add, gently ease back the return hose from the heater radiator, ensuring the radiator filler cap is removed at this time. The escaping coolant will confirm the effective flow through the system and in addition will allow the escape of any possible trapped air from the system at the same time. I'm unaware of a heater control valve on your model, however I have seen these types of valves creeping in and out of production over different years and models. Ford Ka's for example are very common for failures which is an inexpensive switch in the dashboard. If you can confirm the presence of such a switch in your model then I think your almost there. y fingers are crossed for you.

  • Don Dec 27, 2010

    Install an auxillary water pump and it will solve the problem. Later cars had a nice pimp that can be fitted. Just find a switched power source for it. Common problem solved.

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How do i turn on the heater in my 1996 audi a4.. dont know where the control for this is located.

Posted on Aug 31, 2009

  • Jon Walston
    Jon Walston Jan 03, 2014

    the controls are below the radio

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