1997 Audi A4

stevedag · Posted at Thu Sep 04, 2008 2:12 pm

Heater problem
1997 Audi A4 6 cyl All Wheel Drive Manual 90,000 miles
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When I'm driving (in motion)my heat works.When I slow down to a stop the heat stops.The thermostat has been changed already..

KHLow2008 · Posted at Sat Sep 06, 2008 5:54 am

Hi stevedag,

Did you check the coolant level? Does reving the engine slightly when vehicle is stopped make any difference?

stevedag · Posted at Sat Sep 06, 2008 8:13 am

coolant level is fine..If I keep the rpms at 3000 while im stopped the heat will blow.

KHLow2008 · Posted at Sat Sep 06, 2008 10:20 am

Hi stevedag,

There is a possibility of clogging in the water passage of the heater core.

Is there any sign of overheating?

stevedag · Posted at Sat Sep 06, 2008 6:29 pm

No over heating at all.Tge car has been running great other than the heat..I did check the input and out put hoses thru the fire wall, one is hot the other is not..Is there a way of unclogging the core??? Steve

KHLow2008 · Posted at Sat Sep 06, 2008 9:57 pm

Check open/close valve for proper operations. If the clogging is minor, remove the hoses and apply some pressure to get it unclogged. If it is in the heater core, you might need to replace it.