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  #1  
Old 06-29-1999, 02:15 PM
budman
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The a/c on my 88 300E changes from a/c to heat when at a stop light. Goes back to a/c
a few moments after acceleration. In winter
it acts in reverse. Cool air at idle and heat
at speeds. Is this a vaccuum problem? If so
where is the source of the leak? Any help will be appreciated! Thanks


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Paul
  #2  
Old 06-29-1999, 09:35 PM
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Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The heater valve is switched off by when the pushbutton sends power to it. So whenever the heat cycles there should be a signal fron the P/B unit.
  #3  
Old 06-29-1999, 10:56 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
It sounds as though you have two or three problems
1 not enough air flow over the condenser core/or low freon output/low compressor output.
2 aux water pump inop (no heat at idle)
3 vac leak (poss at the source.)

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