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a/c problem on 1990 BMW 735i

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
a/c works good when driving but gets very bad when you stop at a light
(2) Answers
you should check your compressor or the belt of the compressor as well the ball bearings .....
Check your compressor you might have a compression problems also consider to have a general cleaning on your A/C which includes flushing the A/C system.