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Hissing sound, after car is shut off??

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Old 01-16-2005, 12:12 AM
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cosmos
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Question Hissing sound, after car is shut off??

When I turn the car off, I am getting a hissing sound coming from the passenger side rear, it sounds like it is coming from the muffler, but I dont think it is. It goes away after about 30 secs.

I did not use the air conditioner or the heat.

Any ideas?
Old 01-16-2005, 02:32 AM
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wwest
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How do you prevent the use of the A/C/?
Old 01-16-2005, 02:37 AM
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I just dont use the HVAC unit. It is always off.
Old 01-16-2005, 02:30 PM
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I installed a switch in the A/C clutch circuit because I found that otherwise I couldn't prevent it from operating in defrost/defog/demist mode.

Not supposing in any way that what you're hearing is refrigerant bleeddown.

Could it be a bleeddown of the ABS brake fluid pressure? Most ABS/Trac/VSC(PSM) have a nitrogen pressured accumulator as "reserve" fluid pressure but I don't think it should bleed down, at least not normally.



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