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