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Old 08-31-2006, 11:37 AM
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Join Date: Aug 2006
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So my heat doesn't work when I start driving. I have plenty of heat when I am driving slow or standing still, but once my car starts going over 40 MPH, only cold air comes in. I have a 1988 420 SEL. Is there a door open in the heating system somewhere or a guard missing? Can someone help?


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Old 08-31-2006, 12:08 PM
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smoke gets in your eyes
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,832
Do a search on monovalve, specifically replacing the monovalve cartridge. Or don't do a search and just replace the monovalve cartridge

93 300SD
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Old 09-01-2006, 07:00 AM
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Join Date: Aug 2006
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Thanks Sixto, I read your conversatiion on Monovalve where another person was trying to figure out if they shorted their monovalve. Would it be my monovalve if I have heat when I am standing still? Seems like plenty of coolant is getting into the core because I have heat when standing still. Thanks for your help.

C. Landry
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Old 09-01-2006, 07:12 AM
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Join Date: Aug 2006
Posts: 9
Sixto, sorry to jump the gun, I read further about the Monovalve and have noticed that one of the symptoms is heat at low RPM's going away to no heat when RPM's are raised. I found a new monovalve online, but could you direct me in a direction, where I can buy a rebuild kit? Trying to save a little bread.

Thanks again,

C. Landry

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