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  #1  
Old 05-06-2008, 10:46 PM
79Mercy's Avatar
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AC compressor knocking

My compressor has made a knocking noise for as long as I can remember but it is now alittle worse. About a month ago I topped it off with a can of R134a and now the air is alot cooler. Ever since the knocking has been alittle louder, and the air is still very cold. Does it need some oil or something? Thanks

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

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  #2  
Old 05-07-2008, 08:37 PM
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sounds like your compressor may be going. Add one of those oil charge cans for r134 they sell at the parts store see if it helps. what type of compressor do you have york or R4? cubelike or round?
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  #3  
Old 05-07-2008, 10:57 PM
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I have the york compressor, what makes the knocking sound?
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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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  #4  
Old 05-08-2008, 09:36 AM
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Quote:
Originally Posted by 79Mercy View Post
I have the york compressor, what makes the knocking sound?
It's more than likely made by lack of lubrication.

When refrigerant leaks the oil leaks out with it. Someone already suggested adding oil, I wil second that.

Danny
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  #5  
Old 05-11-2008, 08:56 PM
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How do I add oil? I see cans of PAG oil, but how do I get it in the system?
__________________
1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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  #6  
Old 05-12-2008, 07:47 AM
mrhills0146
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Get oil into the compressor ASAP. Also check and make sure that the circuit is not over-fused. If that compressor gets close to letting go, you want the fuse to blow before it seizes up!

Don't ask me how I know this. :-(
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  #7  
Old 05-12-2008, 08:23 AM
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How do I get oil in the system?

__________________
1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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