Hi, where is the low side r12 charge port? Thanks on 1990 Mercedes-Benz 300SL

No cold air.

by in Antelope, CA on August 23, 2012
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2 answers
ANSWER by , August 23, 2012
its the smaller of the 2 fitting and its located around compressor area. poss on compressor or low pressure line
ANSWER by , August 23, 2012
May want to take it to a ac shop. Low side fitting larger of the two look on the larger hose that goes into car.