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Old 11-27-2009, 10:29 PM
Registered User
Join Date: Sep 2009
Location: south texas
Posts: 91
more 560sl high idle stuff

As I mentioned in an earlier thread, I think my problem with high idle is the OVP relay, and as a temp "fix" I wedged a small piece of vacuum hose in it to keep the relay closed= normal idle. Today while checking the oil, I noticed a small humming noise, and it turns out that the idle speed solenoid has current going to it even with the key off/out of the ignition! I'm sure it is because of my forcing the relay "closed", so I guess the OVP relay is powered even with the key off? could this be another sign of what the problem is? I know that keeping the relay closed is not a proper fix/repair. Any thoughts? Anyone have a good used relay? (I am currently cash poor, so $90.00 for a new one is too much right now).



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Old 11-27-2009, 10:37 PM
Registered User
Join Date: Sep 2009
Location: south texas
Posts: 91
Addition to last message: there is a temp switch/sensor that has a 2 wire connector going to it, and when I first got this car, the a/c compressor would not come on unless one of the wires was disconnected from it. Could this also be a possible reason for high idle? causing the OVP relay to "open"? just a thought.
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Old 11-28-2009, 11:59 AM
david s poole
Join Date: Mar 2005
Location: dallas
Posts: 1,822
the ovp relay has a terminal #30 which is battery power all the time in mercedes language.the temp sensor you are referring to produces a ground signal [when too hot] to shut down the a/c relay.
David S Poole
European Performance
Dallas, TX

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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Old 11-28-2009, 11:46 PM
Registered User
Join Date: Sep 2009
Location: south texas
Posts: 91
okay, thanks for the reply!

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