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S-Class (W140) 1991-1999: 300 SD, S 350TD, 300 SE 2.8, S280, 300 SE 3.2, 300 SEL 3.2, S320, S320L, 400 SE, S420, 400 SEL, S420L, 500 SE, S500, 500 SEL, S500L, 600 SE, S600, 600 SEL, S600L, 500 SEC, 600 SEC

Auxiliary fan W140 on all the time, high speed

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Old Jun 3, 2007 | 10:09 PM
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dinh_hai_tran's Avatar
dinh_hai_tran
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Mercedes 560SEL 1991, S420 1994, SL500 1999, E550 2012 4Matic
Auxiliary fan W140 on all the time, high speed
Dear experts,
I have a 1994 S420, lately my auxiliary fan on all the time with a very high speed and of course make lots of noise. I have change two temperature sensors (not the one connect to the gauge). I have checked the auxiliary fan relay and it's OK. The cable harness is new.
What should I do next?
Any advise would be much appreciated.
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Old Jun 5, 2007 | 01:42 PM
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Possibly the high pressure switch on the A/C. Does your A/C compressor engage? If not then the switch is most likely the cause. Good luck.
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Old Jun 6, 2007 | 08:53 AM
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dinh_hai_tran
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From: Ottawa, Canada
Mercedes 560SEL 1991, S420 1994, SL500 1999, E550 2012 4Matic
Hi All,
I have brought my car to the shop and the mechanics found out that my ACC push button control panel having problem. It sends out hot signal all the time to the relay. This panel would cost me for $2500.00 + tax + labor.
Expensive eh? There is any way to repair this panel?

Thanks,
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