Hello: Check under the hood, if the system has been converted to 134a there should be a sticker saying its been converted. If it still has R-12 the what you will find is the service fitting on the large line (low side) will be larger than the fitting on the small line (high side line) That will for sure tell you the system has R-12. Be sure you add freon to the low side with a/c on and engine running. Check fuses for a/c and heater and blower. With engine running and a/c on check the compressor pulley make sure the whole assembly is turning. If the outer part of the pulley assembly is turning that means the clutch is engaged.
89 is R-12 unless it has been converted to R-134. If the recharge ports are threaded on the outside than it is R-12, if they are smooth it is R-134.
R-12 cannot be purchased over the counter in the U.S.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
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has the vehicle been changed to the new 134A freon? To tell the fittings will look like all GM vehicles 1993 to present.
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