2003 Saturn Vue
4 cyl 5 speed
258,000 kms

This is more of a sound noise.
In the passenger compartment and the car is idling I hear what sounds like a build up of vacuum and then almost that it vents to atmosphere.
Is this normal? Everything appears to work just fine.

Thanks, Shawn

I've heard of this complaint in Saturns and vaguely recall that solutions were not always effective or worth the trouble if everything is working properly. It is likely the sound of refrigerant boiling with even just a short moment of the A/C clicking on - even in colder weather they can when "defrost" is selected,

T
Tom Greenleaf - MetroWest Boston - USA
http://www.acsource.com/

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http://www.autoacsystems.com/tomgreenleaf/

I found a bulletin that may address your concern...

it's bulletin # 04-01-37-006
addresses a hiss type noise..

Quote:
Condition:
Some customers may comment on a "hiss"-type noise when the air conditioning (ac) compressor is turned off.The hiss-type noise may also be heard if the cooling fan comes on in the high speed mode with the a/c compressor on.

Basically addresses replacing the engine cooling fan low speed resistor assembly.

check with your dealer to see if your vehicle falls under the vin (vehicle identification number) breakpoint..

Don't know if this helps or not...

let us know

JIm