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vacuum leak in heater vent valve system? 200

posted by  darmstrong on  Fri Apr 11 15:30 CST 2003
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last visit: Sat Sep 13 12:21 CST 2014
[RELATED]

I don't know if it's always done this, but I've noticed recently that when I shut off the engine I hear a hiss from the centre dash / console area for about 3 or 4 seconds. I imagine this is from the vacuum that drives the valve system that controls the heater vents. It happens about the same whether all 3 buttons are pushed in, or if none of them are pushed in.

Is this a normal pressure bleed, or does it likely indicate a leak that needs to be attended to?






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