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Alexandr 11/29/2011
2002 Audi TT Quattro ALMS Edition 4 Cyl 1.8L - Engine
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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