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99 lumina sedan evaporator leak

mektek on Mon May 03, 2010 3:35 PM User is offline

Year: 99
Make: chev
Model: lumina
Engine Size: 3.8
Refrigerant Type: 134
Country of Origin: United States


I've checked everywhere in the engine bay for a slow leak with both electronic and UV detection and nothing shows. The remaining possibility is the evaporator but I don't see how to access it.
Anybody know how to check it or what parts to remove to get to it?


GM Tech on Mon May 03, 2010 5:03 PM User is offline

Number one leak location is compressor shaft seal followed by compressor body o-rings---I haven't seen an evap leak ever on that style W-car-- so are you sure your shaft seal is okay-- I change shaft seals and have never seen a dry one on a V-5 single lip shaft seal application. If you remove your clutch driver- I'll bet the shaft seal is wet and drooling oil- if it is the OEM compressor.

The evaporator change is a dash pull btw.....

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......

mektek on Wed May 05, 2010 3:56 AM User is offline

The Compressor has been completely resealed - tight as a drum :-)

Looks like I'm in for some misery - it's 95 degrees here in FL and no fun tearing out the dash. I'll try putting in some r134 and using the electronic sniffer around the vents.

In my pathfinder I was able to remove the blower motor and directly access the core. I guess there's no such shortcut with this one.........

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