My 2001 audi a4 had no heat due to a plugged heater core.
Audi a4 b7 heater core flush.
Keep flushing until the water coming out is clear.
Flush the heater core on an a4.
2007 b7 audi a4 2 0l alt cooling system service including coolant flush.
Turn on the water flow not too hard as the heater core is a bitch to replace and watch the gunk come out.
Now is probably a good time to drain flush and bleed your whole cooling system.
How to replace the rear coolant flange and heater hoses on a 2004 2008 audi a4 b7 2 0t.
It is way too expensive to replace the heater core in this car.
Audi a4 a6 and a8 no heat clogged.
Reverse the hose and forward flush again making sure the water coming out is clear.
See how i flushed out the heater co.