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Old 03-05-2007, 05:35 PM
david s poole david s poole is offline
david s poole
 
Join Date: Mar 2005
Location: dallas
Posts: 1,822
the a/c pigtails only control the low speed fan operation.there is an o/heat switch in the waterjacket[close to thermostat] that brings on the fans at high speed.i think it is a blue two pin switch which when it either goes bad or is unplugged brings on the fans at full speed[imagine that,you don't have to o/heat your car to find out that the switch has died].
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David S Poole
European Performance
Dallas, TX
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"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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