Radiator fan problem :( A3 8L 1.8t

Nathxn__

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Hello,
I have made this thread as I am completely out of ideas and hoping someone might kindly assist me.

My car is a 2001 A3 1.8T Quattro and the cooling fans constantly run at full speed if the heater button on the climate control panel is switched on.

If the heater is switched off fans will not come on at all and the engine would overheat. (Fans don't even come off after engine is switched off too cool it.)

I have tried 2-3 used Fan control modules and bought & installed a new OE one and the problem still persists, have also changed the switch in the radiator and all fuses on top of battery are fine.

If any one has any suggestions that could help me I would greatly appreciate your time.

Thankyou for reading.
 

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