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Old 05-05-2016, 11:36 AM
DieselJim DieselJim is offline
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Join Date: Feb 2005
Location: Kennesaw, GA
Posts: 689
Originally Posted by 97 SL320 View Post
I'd work on getting the codes taken care of first then places gauges on the suction and discharge to determine if the system has enough charge.

These cars use a variable displacement compressor so pressures don't act like a compressor that is cycled. One of the pressures remains stable and the compressor varies volume as cooling loads change. I don't recall for sure if the suction or discharge remain stable, pretty sure it is the discharge side.

Next comes trying to find the leak, sometimes this is very difficult. I've gone so far as to clamp AC hoses shut to split the system up then watch for pressure drop. At least this way I have an area to concentrate on.

You will need a scale accurate to 1 ounce to assure proper amount of when recharging.
There may be a leak. If so it is very slow and of course would be challenging to find. Its worth a look. I do think vacuum modules are in play because when the system started acting up I heard what I now realize were vacuum whistles occasionally in the cabin.

The pressure sensor code is of the most concern. I'm not terribly concerned about the others.
My Daily : 96 E-300 Diesel with 195,000 miles
Retired: 92 300D 2.5 T 345K miles and for sale
Retired: 95 E320 157K miles and currently parked with blown engine

Both retired cars are for sale as is my w124 shop inventory
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