PeachParts Mercedes-Benz Forum - View Single Post

babybenz · #4 08-25-2005, 10:49 AM

My pointer is almost 3/4 up the wedge scale. What you are saying is it should be adjusted all the way to the end of the scale, correct?

correct. Make it 100% up to the scale

The front plate on the compressor engages when the AC is turned on inside the car.

You've confirmed the plate (clutch) is operating and the compressor is turning. No need to jump the wires now--red pigtail connection is the fan operation, the other one is for the clutch. No need to replace the relay which is located behind the battery. Clutch engaging so these parts are working properly.

There are bubbles in the sight glass. Is this good or bad?

Lots of bubbles indicated a low freon charge. This sounds like your problem. Get a shop to charge it with r-12. One can may be all it needs. You ought to see considerable cooling improvement with one can (12 ounces) added.

Your AC guy was right about there being a speed sensor that cuts out the compressor, but if he'd looked in the sight glass and seen the bubbles he would have known the compressor was operational and pushing freon. Better yet he should have attached a pressure gauge to determine how many pounds it was pushing. I'd find an independent import car repair shop--call first to see if they service Mercedes AC.

Good luck.