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Compressor Question
I know this is not for a diesel but it is a Mercedes and I figured I would get the best answers here.
This is on my 98 E430. I had a leak in the AC. If I added refrigerant the AC would work great for about a day then nothing. I found the leak in the condenser so I replaced it along with a new dryer. I took everything apart and flushed the evap and hoses and dried them out. I flushed the compressor on the bench with the new ester oil. As I was putting everything back together I added about 5 ozs of oil to the compressor suction port and about 5mL each to the dryer suction and condenser suction. Then I spun the compressor about 10 times. I pulled vac for at least an hour maybe 2. Then I set my charging machine to 2lbs 3ozs and started to charge. The compressor started spinning and cool air was coming out of the vents. About 1/3 of the way through the charge some refrigerant blew out from somewhere around the compressor. Then I noticed the compressor stopped spinning. I assumed it was due to refrigerant leaking out. But after I turn off the car the compressor was too tight to spin. So I called it a day. Next day I come back out and the compressor spins freely. So I try again and the same thing happens. It appears like the compressor is trying to spin but it gets too "tight". It will return to normal spinning after letting it sit. I assume the refrigerant blowing off is a loose connection on the discharge of the compressor. But what is going on with the compressor getting tight and then returning to normal as it sits? Is it some sort of liquid/vacuum lock thing?
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2009 ML320 Bluetec 1985 300CD 1981 300TD Past Mercedes 1979 300TD 1982 300TD 2000 E320 4Matic Wagon 1998 E430 1984 300SD 1980 300SD |
#2
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why are you using ester oil? I think it's mostly for R12 conversion cars...
check with the dealer or local parts counter for the correct oil your car is supposed to use. likely pag 46 or so... the compressor may have a pressure release port on it... some do. I am unfamiliar with your vehicle.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#3
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Quote:
Any idea what could cause a compressor to get "tight" and then loosen?
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2009 ML320 Bluetec 1985 300CD 1981 300TD Past Mercedes 1979 300TD 1982 300TD 2000 E320 4Matic Wagon 1998 E430 1984 300SD 1980 300SD Last edited by Graplr; 06-14-2012 at 05:49 PM. |
#4
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Is it possible for the expansion valve to plug completely, causing the compressor and outlet side to hydrolock? Then the excess bleeds off over time, and lets you repeat?
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James Marriott 2003 Buick Regal 1983 300D (228k, frau Auto) 1996 Suburban K2500 (192k, 6.5 turbo diesel/4WD towmaster 10,000) www.engineeringworks.biz 1987 300SDL junker 170k 1982 300SD junker, 265k |
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