Question about 1996 Audi A4
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
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
Posted on Feb 05, 2009
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
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Posted on Jan 02, 2017
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Temperature Control Blend Door Failure No Heat or no AC (dependes on
where door sticks)
all modern cars there is a tiny DC electric motor driven gear drive
that moves a plastic door that blends heated and cooled air from the
AC and the heater core, this is called (interestedly enough) the air
temperature control blend door actuator. The motor that moves this
door fails because the door starts sticking from warping, most common
complaint is no heat but it can be no AC as well. To replace these
parts (blend door and blend door actuator) you must remove the entire
dash from the car. Always have this problem confirmed by a dealer or
qualified repair shop as it is a very expensive repair.
Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.
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