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Engine Hissing After Short Drive

 
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Just Try It1 Just Try It1
Moderator | Posts: 2796 | Joined: 08/14
Posted: 06/30/18
11:51 AM

hissing could be several things

are you loosing engine coolant??

do you have any vacuum leaks..

you could have a failed power brake  booster..  those will hiss..

you A/C system will hiss for 15 or 30 seconds after shut down as the high side pressure flows thru the filter orifice..  

Just Try It1 Just Try It1
Moderator | Posts: 2796 | Joined: 08/14
Posted: 06/30/18
10:19 PM

My car doesn't have air conditioning. It does have a ventilation/heating system. Does that count as an AC system?  

nope..


once in a while. jeeps... will shut down and have a hissing noise thru the throttle body as the throttle is closed when the engine is shut off and the atmospheric pressure has to get in to fill the vacuum..

i have heard this from similar cars..  you might be hearing it thru the PCV elbow..  

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