There is a sound of air that rushes through the engine at odd times
while the car is turned off. Can anyone tell me what this sound is?

--
Posted using the http://www.autoforumz.com interface, at author's request
Articles individually checked for conformance to usenet standards
Topic URL: http://www.autoforumz.com/Chevy-Malibu-Sound-air-running-engine-turned-98-ftopict119562.html
Visit Topic URL to contact author (reg. req'd). Report abuse: http://www.autoforumz.com/eform.php?p=580588

Posted Via Usenet.com Premium Usenet Newsgroup Services
----------------------------------------------------------
** SPEED ** RETENTION ** COMPLETION ** ANONYMITY **
----------------------------------------------------------
http://www.usenet.com

Could be a leaky check valve on the power brake booster.
After you shut the motor off for a few minutes do you still have power
assist on the brakes? If not then the check valve on the brake booster is
leaking vacuum.
--
John
"anything you say can & will be misquoted & used against you"
'01 FLHR ''Red"
'04 MXZ 600ho
'99 XC700
BRC mem
"nbsobay81" <UseLinkToEmail (AT) AutoForumz (DOT) com> wrote

could it be the radiator fans running. some cars will run the rad fans even
with the ignition off. dont know the technical reason for this but im sure
some engineer somewhere had a reason!


"Repairman" <repairman54 (AT) earthlink (DOT) net> wrote

Some cars run the fans after the ignition is off to reduce so-called
"hot-soak", which is the rad and underhood temps continuing to rise after
engine shutdown. This occurs on all cars, but can be problematic for
vapor-lock on restart, or causing unnecessary radiator overflow on some
vehicles.


"Christopher Thompson" <kf4drr (AT) earthlink (DOT) net> wrote

well there's my answer as to why they program the pcm to run the fans with
the key off.....thanks chris, i knew there had to be a reason.


"Chris Moore" <paynoattentionto (AT) themanbehindthe (DOT) curtain> wrote

"nbsobay81" wrote:
We were told that this was coming through the ventilation system.
It’s just a gush of air that comes through somewhere while the car is
turned off. If the car has not even been driven in a few days, we
still will hear the air rush through the vent. Is this some sort of
automatic cooling system or should I be concerned at this point with
something greater? The car had just recently been worked on and one
of the things they fixed was the cooling system. They replaced two
gaskets, a sealer, adhesive, coolant and a pump kit. Please keep in
mind that this rush of air never occured before they "fixed" the
cooling system. What do you guys think? I want to get your opinion
before I take this back to the dealer...

Thanks so much for your help