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Old 02-27-2008, 09:32 PM
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Join Date: Jan 2007
Posts: 3
1987 420 sel NO HEAT

I hve no heat in my car at idle (maybe very little at idle just enough to feel luke warm) or driving.. I have read about a Mono Valve but my car does not have one heater hoses run from engine straight to heater core.. Replaced T-Stat no change... Auto unit on dash does have a mind of its own at times but when it seams to be working there is still no heat.. Once and a while I will get a relay around the glove box that will just sit and click on and off for five min and than never do it for another week or more.. Has a new blower motor mine was fried.. Grab heater hoses and they are hot top and bottom but still no heat inside car.. Temp guage on dash runs half way... A/C compressor has no belt but I still have no heat before the belt broke.. PLEASE HELP>>>

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Old 02-27-2008, 09:53 PM
Larry Delor's Avatar
What, Me Worry?
Join Date: Jun 1999
Location: Sarasota, Fl.
Posts: 3,114
Along with the missing mono-valve, are you missing the aux. pump also? If so, it would explain your lack of heat at idle.

It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein

09 Jetta TDI
1985 300D
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