Four Seasons 6491R A/C Compressor Kit
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Four Seasons
 PAC-Kit w/ Reman Compressor

Four Seasons 6491R A/C Compressor Kit

Brand Four Seasons 6491R
Product line PAC-Kit w/ Reman Compressor
Fits Buick, Cadillac, Chevrolet, and Pontiac · 38 vehicles

PAC-Kit line. Built around a remanufactured compressor for A/C service applications.

Application-specific fitment. Catalog notes identify A6 compressor setups and related system details.

Part number 6491R. Use this reference to confirm the correct compressor kit in your catalog.

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Overview

The Four Seasons PAC-Kit with Reman Compressor, part number 6491R, is an A/C compressor kit for select classic GM applications. It is built around a remanufactured compressor and is listed with application-specific notes for A6 compressor setups, making fitment verification important before ordering.

This kit is a fitment-based solution for owners servicing older Chevrolet, Pontiac, Buick, and Cadillac air conditioning systems. The 6491R part number appears in the application notes and product identification, helping confirm the correct compressor kit for the job.

Key Features

  • PAC-Kit with remanufactured compressor for A/C service
  • Application notes identify A6 compressor configurations
  • Includes vehicle-specific fitment details for classic GM platforms
  • Part number 6491R for catalog and cross-reference verification
  • Four Seasons PAC-Kit line for compressor kit applications

Fitment Details

  • Fits 1981 Chevrolet Bel Air, N/A, with A6 compressor; compressor with 5" diameter pulley.
  • Fits 1980-1981 Pontiac Grand LeMans, N/A, with A6 compressor.
  • Fits 1980-1981 Pontiac Parisienne, N/A, with A6 compressor.
  • Fits 1980 Pontiac Grand Am, N/A, with A6 compressor; compressor with 5" diameter pulley.
  • Fits 1979 Buick Riviera, N/A, with A6 compressor.
  • Fits 1979 Cadillac Commercial Chassis, N/A, with A6 compressor; compressor with metric threads.
  • Fits 1978-1979 Pontiac Firebird, N/A, with A6 compressor.
  • Fits 1978 Pontiac Grand Safari, N/A, with A6 compressor.
  • Fits 1977 Buick Regal, N/A, with A6 compressor; compressor with switch.

What It Is Used For

  • Replacing a worn or failed A/C compressor in supported classic GM vehicles
  • Restoring cooling performance when compressor output has dropped
  • Addressing compressor noise, seizure, or clutch-related A/C failure
  • Matching an A6 compressor application with the correct kit configuration

Installation Notes

Verify the compressor style and application notes before installation, especially A6 compressor requirements and any listed pulley, thread, or switch details. Confirm the part number 6491R against the vehicle’s A/C system specifications before beginning service.

Quality Assurance

Four Seasons identifies this PAC-Kit as a reman compressor-based solution for cataloged A/C applications. The 6491R part number and fitment notes provide a clear reference for application matching during repair planning.

Related reading

This part fits 38 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelBody TypeLitersCylindersNotes
1981ChevroletBel Air———w/ A6 Compressor; Compressor w/ 5" Dia. Pulley; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1981PontiacGrand LeMans—5.0LV8w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1981PontiacGrand LeMans—3.8LV6w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1981PontiacGrand LeMans—4.3LV8w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1981PontiacGrand LeMans—4.9LV8w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1981PontiacGrand LeMans—4.4LV8w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1981PontiacParisienne—5.0LV8w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1981PontiacParisienne—4.3LV8w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1981PontiacParisienne—4.4LV8w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1981PontiacParisienne—3.8LV6w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1981PontiacParisienne—5.7LV8w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1980PontiacGrand Am—5.0LV8w/ A6 Compressor; Compressor w/ 5" Dia. Pulley; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1980PontiacGrand Am—4.9LV8w/ A6 Compressor; Compressor w/ 5" Dia. Pulley; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1980PontiacGrand LeMans—5.0LV8w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1980PontiacGrand LeMans—3.8LV6w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1980PontiacGrand LeMans—4.3LV8w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1980PontiacGrand LeMans—4.9LV8w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1980PontiacGrand LeMans—4.4LV8w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1980PontiacParisienne—5.0LV8w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1980PontiacParisienne—4.4LV8w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1980PontiacParisienne—3.8LV6w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1980PontiacParisienne—5.7LV8w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1979BuickRiviera—3.8LV6w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1979CadillacCommercial Chassis———w/ A6 Compressor; Compressor w/ Metric Threads; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1979PontiacFirebird—6.6LV8w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1979PontiacFirebird—5.7LV8w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1979PontiacFirebird—5.0LV8w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1979PontiacFirebird—3.8LV6w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1978PontiacFirebird—6.6LV8w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1978PontiacFirebird—5.7LV8w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1978PontiacFirebird—3.8LV6w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1978PontiacGrand Safari———w/ A6 Compressor; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1977BuickRegalSedan5.7LV8w/ A6 Compressor; Compressor w/ Switch; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1977BuickRegalCoupe5.7LV8w/ A6 Compressor; Compressor w/ Switch; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1977BuickRegalSedan5.0LV8w/ A6 Compressor; Compressor w/ Switch; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1977BuickRegalCoupe5.0LV8w/ A6 Compressor; Compressor w/ Switch; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1977BuickRegalSedan3.8LV6w/ A6 Compressor; Compressor w/ Switch; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor
1977BuickRegalCoupe3.8LV6w/ A6 Compressor; Compressor w/ Switch; 57096 (Reman Compressor), 33205 (Accum), 38623 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ Reman Compressor