Heat, defrost & cold air — cab comfort essentials. OEM, GM & aftermarket part numbers for 1988–1998 Chevy/GMC C/K 1500 & 2500. Always verify fitment for your exact year, engine & drivetrain before ordering.
⚠️ Verify before buying. Fitment varies by year, engine (4.3/5.0/5.7/7.4), and 2WD/4WD. These are reference numbers — confirm against your VIN/build before ordering.
📝 Pre-94 trucks were R-12 from the factory; most are retrofitted to R-134a by now. Always replace the accumulator and orifice tube with a compressor, or the new one won't last.