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Is it usual to hear the vacuum bleed down from the heater when you shut engine?

posted by  gunga din on  Tue Oct 10 14:13 CST 2017
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When I turn my motor off, I hear a slow but quite prominent 'psssshhhhhhhhh' sound, like something had strong vacuum on it, then when the motor was turned off, you hear the vacuum leak down again.

I believe it is the weird multi-orb vacuum reservoir thing in the centre console? That looks like a few light bulb sized globes connected together?

I'm not sure that's where it's coming from, but from that general area.








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    Is it usual to hear the vacuum bleed down from the heater when you shut engine?

    posted by  rstarkie on  Tue Oct 10 19:12 CST 2017
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    last visit: Fri Oct 24 10:14 CST 2014
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    The hose that supplies the vacuum for the controls has a one way valve at the manifold.

    The sound you describe occurs when that one way valve is defective. If you pull it off and you can blow air through it from either end you have confirmed that it is defective.







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