Four Seasons 3921R A/C Compressor Kit

Four Seasons PAC-Kit w/ Reman Compressor 3921R

Four Seasons 3921R is an A/C compressor kit for specific 2003-2004 Chevrolet Silverado 2500 HD, Silverado 3500, GMC Sierra 2500 HD, and Sierra 3500 applications. This PAC-Kit w/ Reman Compressor is built for vehicles using a 10S17F compressor and a 13mm orifice tube diameter.

Key Features

• Four Seasons PAC-Kit w/ Reman Compressor for targeted HVAC service
• Fits 2004 Chevrolet Silverado 2500 HD, N/A, with 10S17F compressor and 13mm orifice tube diameter
• Fits 2004 Chevrolet Silverado 3500, N/A, with 10S17F compressor and 13mm orifice tube diameter
• Fits 2004 GMC Sierra 2500 HD, N/A, with 10S17F compressor and 13mm orifice tube diameter
• Fits 2004 GMC Sierra 3500, N/A, with 10S17F compressor and 13mm orifice tube diameter
• Fits 2003 Chevrolet Silverado 2500 HD, N/A, with 10S17F compressor and 13mm orifice tube diameter
• Fits 2003 Chevrolet Silverado 3500, N/A, with 10S17F compressor and 13mm orifice tube diameter
• Fits 2003 GMC Sierra 2500 HD, N/A, with 10S17F compressor and 13mm orifice tube diameter
• Fits 2003 GMC Sierra 3500, N/A, with 10S17F compressor and 13mm orifice tube diameter

Product Details

Part number 3921R is listed for eight confirmed truck applications across the 2003 and 2004 model years. The kit notes specify use without the Ambulance Package and identify a black orifice tube; 2004 applications also note a drier with P-nut fitting clocked at 2:00. For buyers searching for a 2004 Chevrolet Silverado 2500 HD A/C compressor kit or a 2003 GMC Sierra 3500 reman compressor kit, this listing matches the documented vehicle and system details.

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

Common A/C Problems This Part Addresses

• Loss of cabin cooling from compressor failure
• Weak or inconsistent A/C output on Silverado and Sierra HD trucks
• Noisy compressor operation tied to worn internal components
• System service needs after compressor replacement on 10S17F-equipped vehicles
• Fitment issues when the vehicle uses the specified orifice tube and drier configuration

Installation Notes

Verify the compressor style, orifice tube diameter, and package exclusions before installation. Match the 2004 drier clocking note and confirm the vehicle is not equipped with the Ambulance Package. Follow standard A/C service procedures, including system flushing where required by the application notes, and confirm oil and component compatibility before charging the system.

Quality Assurance

Four Seasons supplies HVAC service parts for vehicle-specific repair applications. This PAC-Kit w/ Reman Compressor is cataloged for direct use on the listed Chevrolet Silverado and GMC Sierra HD trucks when the documented system configuration matches.