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Username Post: 1999 silverado 1500 5.3        (Topic#357661)
sprog777 
Poster
Posts: 70

Reg: 03-27-10
08-15-19 12:07 PM - Post#2773251    

For those in the know...My air compressor is leaking at the back of the a/c. Could i be so lucky to have a blown gasket or o ring.I thought i would see the leak around the front seal. Is this a common place for the a/c to leak?

sprog777@yahoo.com

1979 K5 Blazer
2001 1500 z71 ext.cab
1999 Chevy Tahoe 4wd
1999 chevy z71 ext.cab
1966 Mustang coupe
1967 rs Camaro
1992 Mazda Miata
2009 ultra classic electra glide
1986 Gli


 
rockfangd 
"6th Year" Gold Supporting Member
Posts: 2734
rockfangd
Age: 33
Loc: Utica ny
Reg: 04-13-10
08-15-19 06:55 PM - Post#2773275    
    In response to sprog777

It could be a line connection.
Also check for a overpressure valve.
Alot of times they screw into the back of the compressor.
They are designed to relieve pressure or blow out if the pressure goes too high so nothing drastic happens

Old School GM fan FOREVER


 
wagonman100 
Super Senior Member
Posts: 14303
wagonman100
Loc: Baltimore, MD
Reg: 11-27-04
08-16-19 06:14 PM - Post#2773339    
    In response to rockfangd

Probably an O-ring, though they don’t usually just go bad it can happen. The pressure switch does not blow off excess pressure, it turns off the clutch if the pressure gets too high or too low so that nothing bad happens to the system. You can have someone inject dye into the system to find out exactly where the leak is if you’re not positive of the exact location.

Jay
Friends don’t let friends drive Fords.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon
1957 Cameo Carrier


 
rockfangd 
"6th Year" Gold Supporting Member
Posts: 2734
rockfangd
Age: 33
Loc: Utica ny
Reg: 04-13-10
08-16-19 07:59 PM - Post#2773354    
    In response to wagonman100

I was not referring to the pressure switch blowing out.
But on another note it could be the pressure sensor if it mounts back there.
I have had several leak where the plastic meets the sensor body

Old School GM fan FOREVER


 
wagonman100 
Super Senior Member
Posts: 14303
wagonman100
Loc: Baltimore, MD
Reg: 11-27-04
08-17-19 06:29 PM - Post#2773430    
    In response to rockfangd

I didn’t think you were referring to the pressure switch blowing out. I misread what you wrote. I thought you were misunderstanding how the pressure switch operates. I see you said valve, not switch. I was unaware there is a valve since the pressure switch is supposed to keep the clutch from engaging when pressure is too high or too low. The pressure switch usually isn’t on the compressor. It is usually close to the condenser.

Jay
Friends don’t let friends drive Fords.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon
1957 Cameo Carrier


 
rockfangd 
"6th Year" Gold Supporting Member
Posts: 2734
rockfangd
Age: 33
Loc: Utica ny
Reg: 04-13-10
08-20-19 07:48 PM - Post#2773716    
    In response to wagonman100

Honestly I have done so many systems it is difficult to remember which one is set up how.
I specialize in AC which is rather interesting.
Every different vehicle is set up a different way.
I believe out GMT400s have the switch on the rear of the compressor.
The newer GMs do not have it there anymore though.
You were correct.
NExt time I do one I will have a look for the valve I am referring to. I will post a picture of it.
No response from the OP so no help there.
Lines attach to the side of the compressor on this style, But cannot be ruled out

Old School GM fan FOREVER


 
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