2001 Audi S4 Avant. No heat. The rest of the system seems ok, fans, AC, etc work fine, just no heat.
Thermostat has failed (stuck open) and needs replacement. It's a big job (5-6 hours charged labor for a shop), and requires the front of the car to be removed. Here's a pic of my car (B5 A4) a few weeks ago when I changed mine:
http://farm3.static.flickr.com/2456/4026320040_32ef32e2d2_m.jpg
There's no way around it either - removing the front of the car is the only way to access it.
Had the same problem. Green coolant was mixed with Audi red and caused it to jell in the heater core. Had to run it with a fluid the dealer provided and have it flushed after two weeks. Heat came back but still not really hot. May need to flush again. If you have had your belt changed, the thermostat and water pump should be new.
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