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Old 01-13-2002, 12:31 PM
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Join Date: Jan 2002
Posts: 29
1988 560SEL climate control/heating

We recently purchased a used 1988 560 SEL with 146K miles. It's a great car but the heater seems to be possessed. The problem is we lose heat when driving on freeways. Usually, stopping returns heat to the vehicle but it is unpredictable. I've tryed removing and testing the monovalve and auxiliary pump. By passed heaaaater control by unplugging monovalve. Removed and tested thermostat (compared to a new one in a pan of hot water). Currently, I'm removing the water pump to look for the problem there. Anyone had this problem? How did you resolve it?
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Old 01-13-2002, 01:10 PM
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The symptoms you described sound like a monovalve problem...
Is the rubber seal on the valve torn or the rubber diaphragm??

I had the same problem last winter and replacing the monovavle solved it.
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Old 01-13-2002, 02:27 PM
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Join Date: Jan 2002
Posts: 29
Thanks, I had the monovalve out early on. Nothing showed any damage. I'm not sure where the diaphram or seal are. I blew through it and it was open. I then applied current to the solenoid and it closed and opened with the current on or off. I thought it might be sticking sometimes so removed the connector so it could not close and we still lost heat after prolonged cruising. Just got the water pump out and it looks like new on the inside. Think I'll order a monovalve too like you suggest.
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