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Old 10-28-2005, 01:34 AM
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Join Date: Aug 2005
Location: Southborough, MA
Posts: 42
Help Needed With Heater Problem

I recently bought a 1991 300CE and the only issue with it involves the heater. The heater blows cold until the car is in motion and then it appears to work fine. My instinct tells me there is probably some sort of restriction going on here... the main water pump replaced 2k ago. I plan to have the system back flushed under pressure to try to clear out heater core. If this fails, I thought of checking the 2 auxillary water pumps next. How is this best done? Also, any other ideas/thoughts on this? Could the mono valve be the culprit? Many thanks to all in advance,
Jeff & Jo

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Old 10-28-2005, 06:32 AM
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Join Date: Mar 2005
Posts: 43
this is normal. not to worry. heat doesn't come on until coolant temperature rises to a cetrtain level. don't start back flushing systems uneccessarily.
1989 300TE
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Old 10-28-2005, 09:27 AM
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Join Date: Apr 2003
Location: Brandon, Mississippi
Posts: 5,203
Also...check you coolant level. Sometimes simple is overlooked

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