Merc 450SL 1978 interior fan running.

Martyndogs

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Hope someone can shed some light on this. My SL has developed a fault of allowing the heater fan to run flat out when the engine gets hot. Once the car is left to cool all is ok until it warms up to operating temp at around
180f-200f. I have checked all the connnections and possible short circuits but nothing is evident. I did wonder if there is a resistor built into the wiring that may have gone s/circuit allowing a voltage to reach the fan motor.
Any help would be appreciated rather than having to rewire the fan.
Regards Martyn at Lancaster.
 

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