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2003 Saturn Vue: Magic?

infj23 on Mon July 05, 2010 5:46 PM User is offline

Year: 2003
Make: Saturn
Model: Vue
Engine Size: V6
Refrigerant Type: 134a`
Ambient Temp: 85
Pressure Low: unk
Pressure High: unk

A/C on my daughter's Saturn Vue stopped. Blower motor worked, but was just blowing hot.

I checked under the hood for obvious problems, finding none: belt in good condition, all A/C connections and hoses appeared tight with no obvious holes or leaks, radiator fan worked.

Went to attach my gauge set. Took the dust cap off of the low side and tried to attach the gauge hose. I'm not a fan of these 134a connectors and always have trouble. When I tried to connect, I missed but got a quick (nano-second) shower of 134a, which seemed to have a lot of pressure behind it. So, just guessing, it seemed that there was pressure, at least some refrigerant, and so I would look elsewhere for troubles before I wrestled with the gauges again.

I checked all of the fuses in the fuse box. Every fuse was good. Noticed a relay in the fuse box for the A/C clutch. Removed it, applied 12VDC to the correct prongs, heard the "click," then put my ohm meter across the relay and had no resistance when 12VDC was applied and infinite resistance when not, so the relay worked as advertised. I then noticed a fuse-like thing in the fuse box which was labeled "A/C Diode." I removed it, had no idea what I was looking at, and put it back. Then I started the car, turned on the A/C full blast, and felt cold air. I put my thermometer in the middle vent and got 44F--plenty cold, about a 40 degree drop from ambient. Two days later, with several trips, the A/C still works fine.

Any of this make any sense? Any chance that relay was stuck and I unstuck it? If so, should I go ahead and replace the relay? Did pulling/replacing the A/C diode do anything?

I love the magic--just wondering if it will last.

Thanks in advance to all!

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