1997 Audi A4

STEVEDAG

MEMBER
1997 AUDI A4
6 CYL
AWD
MANUAL
90,000 MILES

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.

Thursday, September 4th, 2008 AT 5:12 PM

5 Replies

KHLOW2008

MECHANIC
41,814 POSTS

Hi stevedag,

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

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Saturday, September 6th, 2008 AT 8:54 AM

STEVEDAG

MEMBER
4 POSTS

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

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Saturday, September 6th, 2008 AT 11:13 AM

KHLOW2008

MECHANIC
41,814 POSTS

Hi stevedag,

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

Is there any sign of overheating?

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Saturday, September 6th, 2008 AT 1:20 PM

STEVEDAG

MEMBER
4 POSTS

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

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Saturday, September 6th, 2008 AT 9:29 PM

KHLOW2008

MECHANIC
41,814 POSTS

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.