I never had reliable a/c until I replaced every part (at the same time) and filled with nitrogen/ blah blah and finally charged with r12.

If you want your a/c to give 20 more years of reliable service, change everything all at the same time and be done with it.

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Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2