Just returned from a week in Florida and a chance to exercise the A/C for the first time this season. Also the "perfect" time for the A/C to start acting up in 85-90 degree weather.... Grrrrr

I have tried a forum search but cannot seeem to find any entries relevant to my problem, so I'm hoping somebody here has some ideas.

The A/C will usually work just fine for a while with ice cold air from the vents, but then it just quits. No amount of adjustment or buttom pressing re-activates it. Sometimes after a stop for a while it will work again but always quits soon after. The length of time it works varies from a few minutes to about half an hour.

I have checked all the visible electrical connectors for possible bad connectivity and removed and replaced the #5 fuse in the fuseholder and made sure the contacts were clean. Thinking the Freon-12 may be low I had an A/C shop in Port Charlotte check the system. They said it was a bit low, but not too bad. They pulled a vacuum and it held fine so they re-charged the system and added some lubricant and tracer dye. Initially the A/C seemed fine after this but again after a few miles it quit once more.

The Compressor Clutch and Dryer were both replaced about 18 months ago and the system worked fine through the last two summers. The Compressor is the original (as far as I know) but the Hoses were repaired or replaced within the last 5 years by the PO.

I still thinking it might be electrical due to the intermittant nature of the problem, but I'm not quite sure what to look for next.

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1991 M-B 560SEL Arctic White/Grey 99,000 Miles
1987 M-B 300SDL Ivory/Palomino 229,000 Miles (sold but never forgotten)
2006 Volvo XC70 Blue/Beige
1999 Porsche Boxster Arena Red/Savanna Beige
1986 Porsche 928S Goldweiss/Brown