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How bad of a leak?

pf24 on Fri July 24, 2009 2:53 PM User is offline

Year: 1997
Make: Pontiac
Model: Bonneville
Refrigerant Type: R134a
Country of Origin: United States

My A/C had a leak that I wanted to fix; about 12oz per 8 weeks by my estimate. I injectcted dye and the only dye that showed up was a very small amount at a condenser fitting. I also suspected the service ports due to small amounts of pressure building up under the dust caps making them hard to remove. I changed out the service ports and changed the double o-rings on the condenser fittings. Now I am going to evacuate and get it refilled.

Here is my question; I pull 30" hg and let it sit for 4 hours; at the end of that time it is down to 29" hg. Is my system still leaking? How bad? I am going to do an overnight test tonight. What are the next steps to find this leak?


Side question; when I was at the condenser fitting I changed out my orfice tube for good measure; the old one had some metal chips on it. Does this mean my compressor is about to die?


Side note; regarding the service ports; unfortunately the ones that came from AC kits had the wrong thread size, so I got some made in china ones from the local store. These ones were defective out of the box and wouldn't hold vacuum. I changed them out again with made in chan ones with no luck. I finally ended up getting pontiac parts (AC-Delco) and putting them on.

Thanks in advance.

daman on Fri July 24, 2009 3:52 PM User is offlineView users profile

have you checked your shaft seal and case O rings for dye/leaks??

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

pf24 on Fri July 24, 2009 4:40 PM User is offline

Thanks,

Ok; I got under the car and it looks like there is dye coming from the electrical pressure switch that threads into the hose assembly on the back of the compressor. No dye from bottom of pulley area.

Is this pressure switch replaceable? The aluminum looks like it has aged and corroded so I am wondering if I will be able to get the old one off. Maybe I shouldent be touching it as it may break.

daman on Fri July 24, 2009 5:09 PM User is offlineView users profile

that O ring on that switch is replaceable,sounds like you need to remove the comp clean the corrosion from the O ring areas and over haul it with all new O rings/shaft seal i really do, or your just going to have problems down the road with pesky leaks here and there popping up.

-------------------------
'00 Pontiac Sunfire 2200 I4 SFI
'99 Chevy 4x4 Z-71 5.7 Vortec v8 CPFI
'97 Chevy 4x4 6.5 Turbo Diesel 2500
'95 Pontiac Grand Am GT 3100 v6 SFI
'88 Chevrolet Camaro IROC 5.7 TPI(49,000 original miles)

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