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Q: 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
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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?
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