1997 Audi A4

1997 AUDI A4
90,000 MILES • 6 CYL • AWD • MANUAL
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STEVEDAG
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  • 4 POSTS
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..
Sep 4, 2008 at 5:12 PM
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KHLOW2008
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Hi stevedag,

Did you check the coolant level? Does reving the engine slightly when vehicle is stopped make any difference?
Sep 6, 2008 at 8:54 AM
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STEVEDAG
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  • 4 POSTS
coolant level is fine..If I keep the rpms at 3000 while im stopped the heat will blow.
Sep 6, 2008 at 11:13 AM
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KHLOW2008
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Hi stevedag,

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

Is there any sign of overheating?
Sep 6, 2008 at 1:20 PM
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STEVEDAG
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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
Sep 6, 2008 at 9:29 PM
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KHLOW2008
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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.
Sep 7, 2008 at 12:57 AM