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#2309768 - 06/06/11 05:44 PM Hissing sound after shut off?
CrownCyd Offline
Member

Registered: 04/23/10
Posts: 122
Loc: ma
After i get out of my car i hear a hissing sound coming from under the engine and it seems likes it is on the passenger side. I will shut off my car, and hear the hissing sound and it slowly dies off. Anyone know why this might be happening?
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#2309773 - 06/06/11 05:53 PM Re: Hissing sound after shut off? [Re: CrownCyd]
gahorneck Offline
Over the Hill

Registered: 01/13/10
Posts: 1542
Loc: AL
Climate control system
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#2309776 - 06/06/11 05:59 PM Re: Hissing sound after shut off? [Re: gahorneck]
Just_Ray Offline
Member

Registered: 05/02/11
Posts: 307
Loc: Omaha, NE
Originally Posted By: gahorneck
Climate control system



More specifically, It's the pressure equalizing in the A/C system, Pressure is relieving through the orifice used for the pressure drop.


An experiment you can try.....Start car with A/C off.....turn car off....No Hiss right?

now

Start car and turn on A/C....let it blow till it's cool then shut off the engine.....Hear the hiss?

I bet it's back.


It's a totally inherent quirk for almost every vehicle, Totally normal...


Edited by Just_Ray (06/06/11 06:01 PM)
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#2310213 - 06/07/11 11:17 AM Re: Hissing sound after shut off? [Re: CrownCyd]
walnutavenue Offline
Member

Registered: 12/29/10
Posts: 194
Loc: Illinois
I make a point of shutting off my air conditioning a couple minutes before I get home, in an effort to get as much condensation out of the system as possible. Every drop that drips/evaporates away while I'm driving is a drop that's not sitting on the frame, making it rust.

It might be wasted effort, but it can't hurt.
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#2310217 - 06/07/11 11:24 AM Re: Hissing sound after shut off? [Re: CrownCyd]
98VicP71 Offline
14.6@93MPH
Grand Poobah

Registered: 03/28/06
Posts: 12731
Loc: ATL
I say A/C system. If you had a civy vic with RAS it could be the system purging some of the air out of the system.

My town car would purge some of the air out of the RAS system to lower the rear of the car a little so you could access things in the bottom of the trunk easier.
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1993 Lincoln Town Car 150k+ - RIP 5/10/2011
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#2310225 - 06/07/11 11:44 AM Re: Hissing sound after shut off? [Re: CrownCyd]
NCHeel Offline
Over the Hill

Registered: 07/03/10
Posts: 1278
Loc: Charlotte NC
Snakes in a MFing Vic. Straight to DVD.
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#2310653 - 06/07/11 09:03 PM Re: Hissing snakes after shut off? [Re: NCHeel]
Just_Ray Offline
Member

Registered: 05/02/11
Posts: 307
Loc: Omaha, NE
Originally Posted By: NCHeel
Snakes in a MFing Vic. Straight to DVD.



LOL - Straight to DVD no doubt haha.

So yeah at least we got it narrowed down.....A/C unit orrrr Mother effing Snakes on a Mother effing Vic.



Edited by Just_Ray (06/07/11 09:04 PM)
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