I have noticed that when I turn on heater or A/C. The moment I turn the dial up to increase air flow (left hand dial 1 thru 4) a short hissing sound can be heard from the undercarriage of my vehicle. In warmer weather it happens much more frequently and sometimes during acceleration. I do lose engine power, but very much. I was thinking that a valve needs to be replaced, but would like to have a starting point.
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Saturday, December 15th, 2007 AT 12:44 AM