Quote:
Originally posted by BWatson
Strangely enough, since I had to replace one of the 5 changeover valves under the dash, my car loses vacuum over night only if I leave the air on cold. If I turn it to heat or turn the system off altogether, it holds full vacuum pressure overnight. Before I replaced the valve, there was no problem whatsoever. Opened a can of worms perhaps?
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Well my car has held vacuum really well now. It hasn't failed to hold vacuum for more than a week now. However, there is one thing that I started doing that I don't think I did before. That is switch the A/C off.. that might have something to do with it.