Heater Fan won't quit on 2001 156 - Alfa Romeo Forum
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Heater Fan won't quit on 2001 156

Anybody had this experience? Key off, fan control off, still the fan is running. I've disconnected the battery but this needs to get fixed. Suspect it's a short at the fan motor. Any help appreciated.

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Same with me...

Hi, did you find out what this is, went out to my 156 this morning, all fine til I started it, then same as yours, the fan won't quit with everything turned off!

Disconnected battery at the moment..
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perhaps a sticking relay for the fan activation ? Relays are mounted on/near the battery...
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heater fan won't quit

spent all morning researching this, then removed the resistor/control unit block mounted on the passenger side behind the glove box on the bulkhead, (next to the fan). Unit contains two power transistors, one of which was dead short. Since alfa in their wisdom put 12v permanently on one side of the fan, the short earths the other side, hence the constant running. Ordered a replacement block, 16 second hand, although the transistors are easily replaceable, IRFZ44 power MOSFET, available from CPC-Farnell. Awaiting unit, hopefully no other damage...
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156 , 2001 , fan , heater , quit

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