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Old 09-12-2002, 12:33 PM
junior member
Join Date: Oct 2001
Posts: 592
loosening compressor

what do i have to do to loosen the air conditioning compressor on an 83 300d turbo so i can move it out of the way to allow replacement of oil cooler lines. i have looked under the hood and i have searched. i have no idea. thank you.
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Old 09-12-2002, 01:51 PM
Posts: n/a
You will find a number of bolts than run through the compressor in a fore/aft direction. Loosen all of them and then find the stud and nut that serves as the tensioner. Loosen the tensioner until you can get the belt off. Then remove the brackets that secure the a/c hoses in place. Tie some wire or something to the compressor to support, then remove all those fore/aft bolts completely. You can then use the wire to lift the compressor up out of the way without disconnecting the lines. Don't forget the hose brackets for the hose that goes across the top of the motor.

Good luck,
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Old 09-12-2002, 04:21 PM
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Join Date: Apr 2000
Posts: 459
Hold up Larry! You don't need to remove the compressor to do this job. All you need to do is loosen it. There are three bolts on the back of the compressor; two most easily accessible from the top, and the third (closest to the block), easily accessible from lying underneath the car. A tool that makes loosening and tightening these bolts a breeze is a 3/8 ratchet with a hinge on it (sold at sears). The one bolt that the tensioner pulls on doesn't really hold the compressor tight, so don't crank down on it.

'84 300D, 166k
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Old 09-12-2002, 05:39 PM
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Join Date: Apr 2000
Posts: 459
THIS IS IMPORTANT: Please, please, please do not replace your lines with anything but cooler lines from the dealer. The genuine OEM parts will actually have the Mercedes star stamped on them, and probably will say "CONTI" on the rubber. I unfortunately bought my hoses from an on-line Benz parts place (not Fastlane), and they sent me a part which they claimed was OEM. Within about 50 miles the rubber part of the hose ruptured and would have cost me my engine had I not stopped and noticed all the oil under the car before I ran out of oil or pressure.

Don't play games. Buy your hoses directly from the dealer.

Interestingly, the lines were stamped "CRP," which, after a little research, I discovered is the U.S. affiliate of Continental (a German company). Why the same company would make the same hose for our cars of varying quality I don't know, especially considering the consequences.... I sent my ruptured line to CRP in New Jersey and they said they will refund my money.

'84 300D, 166k
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