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Old 09-19-2001, 09:22 PM
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Join Date: Aug 2001
Location: Brisbane, Australia
Posts: 46
w126 a/c auxilary fan

I'm wondering if anyone know how to test the auxilary fan for the a/c. it doesn't seem to be kicking in when the a/c is on.
The a/c works o.k. and I've run power to the fan and that powers up o.k. But it dosn't want to kick in while running. I Checked and replaced the fuse. Any ideas.
Thanks Mark
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Old 10-02-2001, 12:34 PM
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Join Date: Jul 2000
Location: Sunny Florida
Posts: 199
The aux fan will come on for 2 reasons: the pressure switch for the a/c tells it to come on, or the engine temperature switch tells it to come one. I think the engine temp switch is at 105 degrees C, and the pressure switch for the a/c is located on the a/c dryer, and comes on when the a/c is turned on. Try jumping across the dryer switch and checking to see if this makes the fan come on, with the ignition on and a/c turned on.

Good luck!
1989 560SEL (172k)
1989 325IC (122K)
2004 Suzuki Volusia LE (3500 miles)
2005 Yamaha Road Star (20 K miles)
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