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vacuum hiss after turning off vehicle

seth21

Active Member
Joined
January 18, 2015
Messages
54
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1
City, State
Georgia
Year, Model & Trim Level
2008
2008 V6.

When I turn off the engine, I hear a vacuum hiss from the passenger side engine compartment that sounds like a vacuum leak and the vacuum lines 'depressurizing' as the sound slowly dissipates.

Do you guys have this to? I wanted to check and see if this was normal before I spent a few hours 'chasing ghost' in the engine compartment.

*I have changed the check valve once about a year ago.
 




Gadget X

Elite Explorer
Joined
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City, State
Gibsonville, NC
Year, Model & Trim Level
'94 XLT 5-speed
It's more than likely the AC system. All of the vehicles I drive do this, so there should be no concerns. If it helps alleviate your concerns, drive with the AC off for a few minutes before you shut the car off, and see if the hissing is still there when you stop.
 




seth21

Active Member
Joined
January 18, 2015
Messages
54
Reaction score
1
City, State
Georgia
Year, Model & Trim Level
2008
It's more than likely the AC system. All of the vehicles I drive do this, so there should be no concerns. If it helps alleviate your concerns, drive with the AC off for a few minutes before you shut the car off, and see if the hissing is still there when you stop.
Good plan! I'll try that
 




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