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AC leak on 97 Lumina sedan w/V5

jay on Wed February 06, 2008 7:24 PM User is offline

Year: 1997
Make: Chevy
Model: Lumina Sedan
Engine Size: 3.1

AC quit on wife's 97 Lumina Sedan. She noticed it yesterday when temp reached 74 here in NC.
AC on this car has always worked excellent, never any problems. Has 162,000 miles.

I checked it out and it is low on refrigerant. I have all the tools (gauges, vac pump, charge scale, R134a leak detector) to do the job, just don't have any experience with the V5 compressor.

What areas are prone to leaks, shaft seal? I'll have to get the tools to do this if leak is found here.
Any other things I should check beside O tube if I pull the compressor?

thanks, jay

GM Tech on Wed February 06, 2008 7:51 PM User is offline

shaft seal is number one- look for oil sling--- also look for oil dripping from body of compressor-- the non-painted pumps allow corrosion to crawl under the body o-ring seals and start leaking-- if you put flourescent dye in the system- this will confirm both leaks.......

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Travis on Thu February 07, 2008 5:20 AM User is offlineView users profile

You are lucky it went this far. I'd do a complete firewall forward on it.

1993.5 Single Turbo Toyota Supra 714RWHP
1985 Suburban
1997 Pontiac Grand Prix GTP

The Disturbed Crew on Thu February 07, 2008 4:02 PM User is offline

GM tech is right. On an OE unit most leaks are from the shaft seal. On a rebuilt unit leaks come from,
#1. Shaft seal.
#2. Thru bolt holes.
#3. Case "O" rings.
#4. Pop-off valves.
In that order.

Remarkably the control valve never leaks. They just fail to equalize pressure.

GM tech, why is it that most of the oil leaks I see on OE and reman units are always on the rear head section and almost never on the front nose section?


~It's important to begin a search on a full stomach.
Henry Bromel, Northern Exposure, The Big Kiss, 1991~

jay on Thu February 07, 2008 9:54 PM User is offline

Thanks for the info. Hope to get a chance to look at this over the weekend. Saturday temp is expected to be 60 so maybe can get half-way decent performance check.

BTW, what type of PAG oil does it use.
Mitchells says use GM PAG 12345923.


Edited: Thu February 07, 2008 at 9:57 PM by jay

Chick on Thu February 07, 2008 10:00 PM User is offlineView users profile

Pag 150.. Although I do hear of guys using the Pag blue 125 viscosity in V5's. I've used it myself a couple times.. Seems fine to me...
Pag blue..

Email: Chick


Freedoms just another word for nothing left to lose

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