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Old 05-16-2007, 11:04 PM
J. M. van Swaay J. M. van Swaay is offline
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Join Date: Jan 2005
Location: St. Louis Missouri
Posts: 473
Don't know if your car is the same as mine (95 E320)--if so, one of two things make the fans come on. 107C coolant temperature or refrigerant pressure of about 22 bar. Coolant temp is provided by a thermistor, ac pressure info is provided by a pressure switch. If either the pressure switch or thermistor are faulty, it could result in fans coming on when they should'nt.... Also, it could be a shorted relay but you said the relay was OK. (My vehiclew has two relays, one for temperature activation of fans, and one for ac pressure activation of fans)

If the temperature is less than 60, do the fans come on shortly after startup, or do they stay off?

Last edited by J. M. van Swaay; 05-16-2007 at 11:10 PM.
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