Behind the compressor right before the freon enters or leaves the compressor there is a tube about 5 inches long and a 1 1/4 inch in diameter... What is it for... Does it ever go bad or become plugged............ This is the Compressor series that Mercedes used before they started using the R4(GM) compressor.
Thanks for any help.... I have changed all the O-rings in the system, drained or blown all the oil that I could from the system..... installed a new dryer and expansion valve... vacuumed the system for hours at a time... the blower is working and air comes out the center vents and some from the lower side vents but none of it is cold... maybe cool at best... I have oil in the system and charged the system with 134... 85 percents of what the r12 was... ... I have went thru the sequence twice and still does not get cold...Jim

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James A. Harris

ok dumb question but didnt see mention of it so i have to ask, is the clutch engaging? what are your pressures?

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

Yes the clutch is engaged because I jumpered it so that the freon would be easier to insert and I still have it jumpered.. When I get cold air I will check and see if the clutch will work from the switch.... Pressures are 35 and 275 Jim

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James A. Harris

Sounds like it may be over charged. What's the ambient air temp across the condensor?

I have tried to be carefull and just put in 85 percent of the 2.2 pounds of R12 that the tag on the radiator calls for... about 33 ounces of 134... do you count the sealer, oil and dye as part of the total ounces??? How do I check the ambient temp accross the condenser???? What will that show me and what should it be... the aux. fan came on just like it should... Jim

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James A. Harris

It seemed to me like the pressures were high as if the ouside air pulled across the condensor was hot or it was over charged.
Now that I think about it. You may not be that far off. May have too much oil, sealer... in there.
What did you use to evacuate it with? You need to make sure you pull a decent vacuum to boil off the moisture.
What do the lines feel like? May have warm air blending.