Question about 2003 Audi A4 Cabriolet

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Hot air blows but cools down in 15-20 seconds.

My AC works great. Turn on hot air and it blows hot for 15-20 seconds then cools down. I can turn off the system and wait 10 minutes and it will blow hot air again but cools down 15-20 seconds later. Both Heater Core hoses are hot.

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You likely have a restriction in the heater coolant hose circuit - perhaps a coolant control valve not fully opening, or a kinked hose.
Insufficient coolant volume is flowing to keep the heater core hot.
Try back flushing the heater core system with a garden hose to check flow.

Posted on Nov 13, 2009

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