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Old 08-21-2007, 09:35 PM
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rjk rjk is offline
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Join Date: Oct 2002
Location: Atlanta metro area
Posts: 199
560SL overheat, no fan

My '89 560 SL is overheating. I've traced it to the electric radiator fan not coming on. Is there a relay I am missing or is the fan controlled directly by the temp sensor or computer?

I understand you can jump a connector at the coolant sensor to get the fan to run constantly while the ignition switch is on. Which connector is this?

I'm short on time so can't really do a thorough diagnosis right now which prompts my query for a quick fix to get me through to the weekend.

As an aside, the A/C cabin fan stops when the coolant temp rises above about 90C. Are they connected or is it just happenstance?

1999 E320 (gave to daughter) 250K
1994 F150 (may be the end of its road) 240K
1989 560 SL (Reassembly after paint job) 160K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (still running strong with an upgraded cam) 349K
1986 242Ti (deceased)
1968 GT500KR (under restoration)
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