Four Seasons 6621R A/C Compressor Kit - Front and Rear

Four Seasons 6621R A/C Compressor Kit

Four Seasons 6621R is a PAC-Kit with reman compressor for front and rear HVAC systems on select 1985-1986 Chevrolet and GMC vans. It is built for vehicles using an A6 compressor with a 5.12-inch pulley, metric threads, and a single-groove pulley.

Key Features

• Brand: Four Seasons
• Part number: 6621R
• PAC-Kit w/ reman compressor
• For A6 compressor applications with 5.12-inch pulley
• Metric-thread compressor design
• Single-groove pulley configuration
• Front and rear HVAC fitment

Fitment Details

• Fits 1985-1986 Chevrolet G10, front and rear. Notes: w/ A6 Compressor; Compressor w/ 5.12" Dia. Pulley; Compressor w/ Metric Threads; Compressor w/ Single Groove Pulley; 57098 (Reman Compressor), 33192 (Accum), 38623 (Orifice), 38683 (Exp Valve), 69991 (Flush Qty.2), 59003 (Oil Qty.2); PAC-Kit w/ Reman Compressor.
• Fits 1985-1986 Chevrolet G20, front and rear. Notes: w/ A6 Compressor; Compressor w/ 5.12" Dia. Pulley; Compressor w/ Metric Threads; Compressor w/ Single Groove Pulley; 57098 (Reman Compressor), 33192 (Accum), 38623 (Orifice), 38683 (Exp Valve), 69991 (Flush Qty.2), 59003 (Oil Qty.2); PAC-Kit w/ Reman Compressor.
• Fits 1985-1986 Chevrolet G30, front and rear. Notes: w/ A6 Compressor; Compressor w/ 5.12" Dia. Pulley; Compressor w/ Metric Threads; Compressor w/ Single Groove Pulley; 57098 (Reman Compressor), 33192 (Accum), 38623 (Orifice), 38683 (Exp Valve), 69991 (Flush Qty.2), 59003 (Oil Qty.2); PAC-Kit w/ Reman Compressor.
• Fits 1985-1986 GMC G1500, front and rear. Notes: w/ A6 Compressor; Compressor w/ 5.12" Dia. Pulley; Compressor w/ Metric Threads; Compressor w/ Single Groove Pulley; 57098 (Reman Compressor), 33192 (Accum), 38623 (Orifice), 38683 (Exp Valve), 69991 (Flush Qty.2), 59003 (Oil Qty.2); PAC-Kit w/ Reman Compressor.
• Fits 1985-1986 GMC G2500, front and rear. Notes: w/ A6 Compressor; Compressor w/ 5.12" Dia. Pulley; Compressor w/ Metric Threads; Compressor w/ Single Groove Pulley; 57098 (Reman Compressor), 33192 (Accum), 38623 (Orifice), 38683 (Exp Valve), 69991 (Flush Qty.2), 59003 (Oil Qty.2); PAC-Kit w/ Reman Compressor.
• Fits 1985-1986 GMC G3500, front and rear. Notes: w/ A6 Compressor; Compressor w/ 5.12" Dia. Pulley; Compressor w/ Metric Threads; Compressor w/ Single Groove Pulley; 57098 (Reman Compressor), 33192 (Accum), 38623 (Orifice), 38683 (Exp Valve), 69991 (Flush Qty.2), 59003 (Oil Qty.2); PAC-Kit w/ Reman Compressor.

Product Overview

This Four Seasons PAC-Kit is a direct-fit A/C compressor kit for classic Chevrolet G10, G20, and G30 vans, plus GMC G1500, G2500, and G3500 models from 1985-1986. The remanufactured compressor configuration matches applications that use an A6 compressor with metric threads and a single-groove pulley, making it a focused replacement for front and rear HVAC service on these vans. Four Seasons 6621R is a practical choice when servicing the compressor side of the air conditioning system on these specific Chevrolet and GMC platforms.

Common Repair Uses

• Restoring A/C compressor operation on 1985-1986 Chevrolet G10, G20, and G30 vans
• Replacing a worn or seized compressor in GMC G1500, G2500, and G3500 applications
• Addressing loss of cabin cooling performance in front and rear HVAC systems
• Correcting pulley, thread, or compressor-style mismatch on A6-equipped vehicles
• Supporting A/C system service on classic GM van platforms

Installation Notes

Verify the vehicle uses an A6 compressor with a 5.12-inch pulley, metric threads, and a single-groove pulley before installation. Match the compressor to the existing HVAC configuration and confirm all system components are correct for the application. This part cross-references 57098 and 33192 for the same application.

Quality Assurance

Four Seasons is a long-standing HVAC parts brand known for replacement components across automotive air conditioning systems. Part number 6621R is built as a reman compressor kit for the listed Chevrolet and GMC applications.