Question about 2003 Audi A4
You can hear fan working but it doesn't open the 3 vents that go up to the windscreen, instead it shuts off the central face vents and just blows out of the side face vents, also the air is cold on low but one click up and the air is almost hot
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Posted on Jan 02, 2017
SOURCE: 1998 a4 avant. blows cold
Have you tried flushing the heater core? Check and re-check radiator for any partial clogged, also check thermostat.
Flush the heater core really good, then refill coolant and make sure you get all the air out. Drain the coolant, disconnect the 2 hoses on the firewall and flush in both directions with a garden hose. It would be nice to put a spare piece of hose on each connection to make it easier and not make a mess of the engine bay, but whatever you have to do.
I do not believe there is a water valve of any kind for the heater core. This document has some directions on draining and filling the coolant and bleeding the air out: A4-S4_B5/Engine/19-1 Cooling system components.
Hope helsp. Keep us updated.
Posted on Jan 03, 2011
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