Buy OEM 1991 Mazda Part # BR9R61L30A (BR9R-61-L30, BR9R-61-L30A). A/C Compressor Clutch Coil. Mazda3; To 1/1/07; w/High Speed Pulley. Mazda5; From 8/1/05; High Speed Pulley. W/O MAZDASPEED. Air

Air Conditioning (A/C) Compressor Clutch Coil. Coil and wire Assembly.
A/C Compressor Clutch Coil. From 08/01/2005. High Speed Pulley.

A/C Compressor Clutch Coil

Fits 3, 5

Mazda3; To 1/1/07; w/High Speed Pulley. Mazda5; From 8/1/05; High Speed Pulley. W/O MAZDASPEED.
Air Conditioning Compressor Clutch Assembly - Repair or Replace
If your A/C compressor works, but the clutch won’t engage, your 1991 Mazda may need only a new compressor clutch.