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Old 08-31-2001, 08:27 PM
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94 C220 - Front Electric Fans - Rewire?

My 1994 C220 Electric Fans in front of the radiator need to come on more than they do to keep the condensor cool in the hot South Florida sun. Is there a way to wire the three wires that go to the dryer switch so the fans stay on all the time? There is a red with white wire, a brown with blue wire and brown with yellow wire that go the the pressure switch in the dryer. At first I thought there was a way ground one of the wires to close the circuit but this didn't work. Just about every A/C part on this car is brand new and the A/C works great going down the road, but when sitting I lose cold air from the vents. With 138,000 miles on the car I can say that if it wasn't for the A/C system it is a great car. The A/C on the car has been a real nightmere!!!!!

Thanks for any input you may have!


94 C220
89 300SE (never breaks!)

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Old 08-31-2001, 09:31 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Sounds like you might be a little low on refrigerant. The fans come on with pressure and if you are low the pressure will be low and the fans will come and go if at all.

There is no way the fans should ever stop on a hot Florida day if the pressures are right.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 09-03-2001, 06:54 PM
MBenzNL's Avatar
Join Date: Jan 2001
Location: the Netherlands
Posts: 1,417
The fans are controlled by the airco gas pressure and engine temperature. One of the wires is connected to the dash cluster (engine temp./I have to look up what color and what pin) and once you have that wire disconnected, the fans will run whenever the key is turned into ignition.


1990 300SL-24
1993 C250D
with a minor 600+k kilometer
(the Netherlands)
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