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Hissing after engine shutoff S90-V90

posted by  ned chilton on  Sat Dec 23 06:27 CST 2006
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last visit: Wed Oct 22 08:12 CST 2014
[RELATED]

My wife's '92 960 has developed a vacuum leak that i can't find. It's related to the cruise control system, because cruise does not work now. I think it is the unit that mounts on the fender wall or possibly the brake booster. Probably not the booster because the brakes seem fine but the noise is in that general vixinity. I am very familar with Volvo 240s but not so much this car (even though I put the engine in it). I have never seen this vacuum motor or whatever it is on another Volvo. I have traced the cruise vacuum line to this unit and all lines appear to be intact. How does this thing work (or fail)? Anybody got any ideas? Thanks and happy holidays!








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    Hissing after engine shutoff S90-V90

    posted by  ned chilton on  Sat Dec 23 08:12 CST 2006
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    last visit: Wed Oct 22 08:12 CST 2014
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    Never mind-it's the brake booster. Never seen one fail in thirty years of messing with cars. First time for everything!








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      Hissing after engine shutoff S90-V90

      posted by  hans747 on  Mon Dec 25 07:28 CST 2006
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      last visit: Mon Feb 7 07:55 CST 2011
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      wow, I didn't know they COULD fail








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        Hissing after engine shutoff S90-V90

        posted by  someone claiming to be ace frehley on  Mon Dec 25 08:30 CST 2006 [RELATED]

        vacume opperated heater control switches







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