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#1
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AC compressor noise. 1983 240D
Many little things are happening to the car this summer, 1983 240D. New tires promted a front end alignment. Adjusted the steering box due to "wondering after the new tires, it was just the alignment so I had to adjust the steering box again.
Water pump started leaking and I did not catch the puddle under the car so it over heated on the highway. Had it towed and I replace the water pump ( running fine now) . Shortly after that, a noise started in the front of the engine. Though maybe the timing chain but diagnosed it today to the AC compressor. Occurs only with the AC on. The noise is the sound of a couple of marbles loose. Sort of a random pattern and only at idle. Rev the engine and it stops. AC pressures are normal for todays temperature. I added 2 oz of mineral oil. Still there. Does not occur when the clutch is disengaged. AC is cold. Vent temps normal. Last December I replaced the evaporator due to a leak. New R/D, oil for the Evaporator, expansion valve. Flushed all lines and condensor. And now this noise. Anyone heard this "noise". It is possible the compressor is failing. Don't need that right now. Pressures were 22 Low and 295 High. 95 degrees today. Vent temps 38. Thanks for the input. Dave
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1970 220D, owned 1980-1990 1980 240D, owned 1990-1992 1982 300TD, owned 1992-1993 1986 300SDL, owned 1993-2004 1999 E300, owned 1999-2003 1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD 1988 560SL, 100,000mi, owned since 1995 1965 Mustang Fastback Mileage Unknown(My sons) 1983 240D, 176,000mi (My daughers) owned since 2004 2007 Honda Accord EX-L I4 auto, the new daily driver 1985 300D 264,000mi Son's new daily driver.(sold) 2008 Hyundai Tiberon. Daughters new car |
#2
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I can't explain why, but a loose drive belt will cause a compressor to make those kinds of noises. Mine did the same thing. When I bought a NAPA Kriket belt tension guage and adjusted the belt tension to spec, the noise stopped.
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#3
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Quote:
New compressor. New R/D, expansion valve, condenser, a few new hoses, 170 ml mineral oil, 2.6 lbs R-12. |
#4
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I second a loose belt as the cause. The compressor on my 300 started making this god awful noise at idle, as if the compressor was grinding it's inner workings. Tightened the belt and it was quiet again. Mercedes should have used two belts instead of one on the A/C in my opinion.
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#5
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Well, I bought a kricket tension gauge this afternoon. We
will see if belt tension is the cause. |
#6
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Quote:
My Haynes manual was practically useless. It said tension for A/C and P/S was '50'. Can't be kg, must be pounds. Set both at 50 pounds. It said the alt belts should be '30'. I couldn't get them equal, so the inner is at 30 lbs and the outer ended up at about 25. Most importantly, the noise is gone. Thanks everyone. |
#7
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You might want to check the bolts that hold the compressor on too..... I would even if the noise is gone, you don't want to loose one of them (not easy to find another).
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1985 300D Turbo ~225k 2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k 1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k |
#8
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Quote:
tensioning exercise. They are all torqued properly. |
#9
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To close this post.
I installed 2 oz of AC Mineral oil. Check the charge and added a couple of OZ of R12. Based on the outside temp. Installed a new AC and power steering pump belt due to the power steering belt separating. And the sound is gone. Or at least my Daughter has not mentioned it. And yes, she mentions every little noise in the car. To the point that I tell her to turn up the stereo. I am assuming it was the Mineral oil or probably the belt. Just wanted to complete the post. Dave
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1970 220D, owned 1980-1990 1980 240D, owned 1990-1992 1982 300TD, owned 1992-1993 1986 300SDL, owned 1993-2004 1999 E300, owned 1999-2003 1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD 1988 560SL, 100,000mi, owned since 1995 1965 Mustang Fastback Mileage Unknown(My sons) 1983 240D, 176,000mi (My daughers) owned since 2004 2007 Honda Accord EX-L I4 auto, the new daily driver 1985 300D 264,000mi Son's new daily driver.(sold) 2008 Hyundai Tiberon. Daughters new car |
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