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how to empty out the AC compressor lines before running dye to check for leaks?
on 1991 Mazda 929

Replaced the compressor and added 2 cans of ac/oil last summer and stayed cold the whole summer, didn't used it the winter months, an.d now it doesn't blow cold

Asked by for the 1991 Mazda 929
Did you use your defroster during the winter? If so , then you did use the A/C , by default. However, you need the proper shop equipment to recover , vacuum and recharge the system with the dye. Any other diagnostics done , to rule out electrical issues? Like fuse , relay(s) or control panel?