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Alexandr 11/29/2011

2002 Audi TT Quattro ALMS Edition 4 Cyl 1.80L


What functions of big fan and small fan

My big fan stop working 8 months ago engine temp wos normal now temp going just above normal big fan still not working y now temp start going up after 8 months later

1 Answer

Jay Giron

Jay Giron 11/30/2011

The big fan turns on when the coolant has reach the max engine operating temperature.
The small one turns on when the a/c is on because it puts extra load to the engine so the small fan
helps to cool down the engine.

the coolant temperature sensor sends a signal to the ECM that powers the fans. The current first
travels Through a fuse and then the fan relay finally the relay powers the fans.


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