Four Seasons 6565N A/C Compressor Kit

Four Seasons 6565N PAC-Kit Overview

Four Seasons 6565N is a PAC-Kit with a new compressor for select 1991 Chevrolet and GMC full-size truck applications using the R4 compressor platform. It is built for buyers replacing a worn A/C compressor while matching the vehicle-specific pulley and coil requirements listed in the fitment data.

The Four Seasons PAC-Kit w/ New Compressor line is organized for direct application matching, making it easier to identify the correct compressor package for the truck’s original HVAC setup. For 1991 Chevrolet C1500, C2500, C35, C3500, K1500, K2500, and K3500, as well as GMC C1500, C2500, C3500, K1500, K2500, and K3500, this part number is tied to the specified R4 compressor configuration.

Key Features

• Part number 6565N from Four Seasons
• PAC-Kit w/ New Compressor for HVAC A/C compressor replacement
• Application-specific fitment for 1991 Chevrolet and GMC trucks
• Listed for R4 compressor systems with a 5.12-inch pulley diameter
• Single-groove pulley requirement noted in fitment
• GMC applications note a 9 o’clock coil position

Fitment Details

• Fits 1991 Chevrolet C1500, N/A, w/ R4 Compressor; Compressor w/ 5.12" Dia. Pulley; Compressor w/ Single Groove Pulley; 58235 (New Compressor), 33150 (Accum), 38638 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ New Compressor
• Fits 1991 Chevrolet C2500, N/A, w/ R4 Compressor; Compressor w/ 5.12" Dia. Pulley; Compressor w/ Single Groove Pulley; 58235 (New Compressor), 33150 (Accum), 38638 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ New Compressor
• Fits 1991 Chevrolet C35, N/A, w/ R4 Compressor; Compressor w/ 5.12" Dia. Pulley; Compressor w/ Single Groove Pulley; 58235 (New Compressor), 33150 (Accum), 38638 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ New Compressor
• Fits 1991 Chevrolet C3500, N/A, w/ R4 Compressor; Compressor w/ 5.12" Dia. Pulley; Compressor w/ Single Groove Pulley; 58235 (New Compressor), 33150 (Accum), 38638 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ New Compressor
• Fits 1991 Chevrolet K1500, N/A, w/ R4 Compressor; Compressor w/ 5.12" Dia. Pulley; Compressor w/ Single Groove Pulley; 58235 (New Compressor), 33150 (Accum), 38638 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ New Compressor
• Fits 1991 Chevrolet K2500, N/A, w/ R4 Compressor; Compressor w/ 5.12" Dia. Pulley; Compressor w/ Single Groove Pulley; 58235 (New Compressor), 33150 (Accum), 38638 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ New Compressor
• Fits 1991 Chevrolet K3500, N/A, w/ R4 Compressor; Compressor w/ 5.12" Dia. Pulley; Compressor w/ Single Groove Pulley; 58235 (New Compressor), 33150 (Accum), 38638 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ New Compressor
• Fits 1991 GMC C1500, N/A, w/ R4 Compressor; Compressor w/ 5.12" Dia. Pulley; Compressor w/ 9 O'Clk Coil; Compressor w/ Single Groove Pulley; 58235 (New Compressor), 33150 (Accum), 38638 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ New Compressor
• Fits 1991 GMC C2500, N/A, w/ R4 Compressor; Compressor w/ 5.12" Dia. Pulley; Compressor w/ 9 O'Clk Coil; Compressor w/ Single Groove Pulley; 58235 (New Compressor), 33150 (Accum), 38638 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ New Compressor
• Fits 1991 GMC C3500, N/A, w/ R4 Compressor; Compressor w/ 5.12" Dia. Pulley; Compressor w/ 9 O'Clk Coil; Compressor w/ Single Groove Pulley; 58235 (New Compressor), 33150 (Accum), 38638 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ New Compressor
• Fits 1991 GMC K1500, N/A, w/ R4 Compressor; Compressor w/ 5.12" Dia. Pulley; Compressor w/ 9 O'Clk Coil; Compressor w/ Single Groove Pulley; 58235 (New Compressor), 33150 (Accum), 38638 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ New Compressor
• Fits 1991 GMC K2500, N/A, w/ R4 Compressor; Compressor w/ 5.12" Dia. Pulley; Compressor w/ 9 O'Clk Coil; Compressor w/ Single Groove Pulley; 58235 (New Compressor), 33150 (Accum), 38638 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ New Compressor
• Fits 1991 GMC K3500, N/A, w/ R4 Compressor; Compressor w/ 5.12" Dia. Pulley; Compressor w/ 9 O'Clk Coil; Compressor w/ Single Groove Pulley; 58235 (New Compressor), 33150 (Accum), 38638 (Orifice), 69991 (Flush), 59003 (Oil); PAC-Kit w/ New Compressor

Common Replacement Uses

• Restoring A/C compressor operation on 1991 Chevrolet C1500 and related C/K truck models
• Replacing a noisy, seized, or weak compressor in R4-equipped HVAC systems
• Addressing poor cabin cooling caused by compressor wear or internal failure
• Correcting belt-drive issues tied to the specified single-groove pulley setup
• Matching the original compressor configuration on select 1991 GMC trucks

Installation Notes

Verify the vehicle’s compressor style before ordering: this part is listed for R4 compressor applications with a 5.12-inch pulley diameter and single-groove pulley. GMC fitments also specify a 9 o’clock coil position. Confirm the existing HVAC layout against the notes for your exact Chevrolet or GMC model before installation.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Quality Assurance

Four Seasons is a recognized HVAC parts brand with application-specific cataloging for compressor replacement. Part number 6565N is listed with detailed vehicle fitment to support accurate selection for the confirmed 1991 Chevrolet and GMC applications shown above.