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-   -   a/c pressures (http://www.peachparts.com/shopforum/tech-help/21849-c-pressures.html)

nickt 08-09-2001 09:57 AM

a/c pressures
 
Just out of curiosity, I'm running 250lbs on the high side and 20lbs on the low side at 2500rpm on a 1988 300sel a/c system and I do not see any bubbles in the sight glass at all-even when the system starts up. Is that within specs? I misplaced my old a/c manual. Also, the system runs for 50-60 seconds then shuts down and will not cycle back on unless I shut the engine off. Any advise would be highly appreciated. Thanx Nick

Mike Murrell 08-09-2001 10:27 AM

I'm at work and don't have the 126 CD-Rom with me, so I can't comment about low/high side pressure.

The system is designed to shut off the A/C compressor if the serpentine belt is too loose. Check out your serpentine belt tension.

nickt 08-09-2001 03:49 PM

I tried that after reading your reply - no difference. Perhaps some temp sensor is non-functional. I like to gather all the suggestions in case there's something I can do to remedy the situation, before having to take it in for repairs. All the fuses are ok, and the aux fan works.

Mike Murrell 08-09-2001 05:00 PM

Try the SEARCH facility. Much has been said about this problem.

Benzmac 08-09-2001 09:22 PM

Those pressures sound OK. If the sight glass is clear and the system is cooling well, don't touch it!

If you are having system problems with compressor not operating properly, I would build a bypass relay to bypass the speed sensor on the rear of the compressor. It was only there as a precaution and now Mercede has done away with most of them.

You will need a 4 pin relay rated at 30 amps and an Electrical Manual. We sell them on CD if needed.


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