HomeHVAC > A/C Clutch and CompressorFour Seasons 3121NK A/C Compressor and Component Kit
Part #: 3121NK

Four Seasons 3121NK A/C Compressor and Component Kit

Complete A/C Kit
12 vehicles fit this part
Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
Complete A/C Kit
Fitment: Buick and Pontiac, LeSabre and Bonneville
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Overview of Four Seasons Complete A/C Kit 3121NK

The Four Seasons Complete A/C Kit 3121NK is designed specifically for Buick and Pontiac models, including the Bonneville and LeSabre. This comprehensive kit provides all necessary components to restore your vehicle's air conditioning system with a new compressor and essential parts.

  • Includes new compressor (part 58994) and accumulator (part 83225)
  • Compressor oil included: PAG oil 150
  • Orifice tube with .062 inch diameter, yellow color, standard style
  • Receiver drier/accumulator with 3.5 inch diameter and 8 inch length
  • Gaskets and seals included for proper installation
  • Compatible with R134a refrigerant systems
  • Limited lifetime warranty for quality assurance

Detailed Product Features and Specifications

This Four Seasons Complete A/C Kit 3121NK features a new compressor (part number 58994) designed to meet the specific requirements of Buick Bonneville and Pontiac LeSabre air conditioning systems. The kit includes PAG oil 150, which is pre-filled to ensure optimal lubrication and performance of the compressor. The orifice tube, a critical expansion device, has a .062 inch diameter and is yellow in color, matching the standard style used in these vehicles. The receiver drier/accumulator measures 3.5 inches in diameter and 8 inches in length, equipped with P-nut fittings on both inlet and outlet for secure connections. Gaskets and seals are included to maintain system integrity and prevent leaks. This kit is intended for use with R134a refrigerant, the standard for these models.

About the Four Seasons Complete A/C Kit Line

The Complete A/C Kit line from Four Seasons offers a comprehensive solution for air conditioning system repairs by including all major components needed for a full system refresh. This approach simplifies the repair process by providing a matched set of parts, including a new compressor, accumulator, orifice tube, and necessary seals and oils. The 3121NK kit is tailored for Buick and Pontiac vehicles, ensuring compatibility and reliable operation.

Common Applications and Repair Solutions

  • Replacement of a failing or seized A/C compressor in Buick Bonneville or Pontiac LeSabre
  • Resolving low cooling performance due to worn or damaged compressor components
  • Fixing refrigerant leaks caused by degraded gaskets or seals
  • Addressing contamination or moisture issues with a new receiver drier/accumulator
  • Upgrading the expansion device with a correctly sized orifice tube for proper refrigerant flow

Installation Notes and Tips

  • Ensure system is fully evacuated and flushed before installing the new kit components
  • Use the included PAG oil 150 to properly lubricate the compressor during installation
  • Verify that the orifice tube is installed in the correct orientation and location
  • Check all P-nut fittings on the receiver drier/accumulator for tightness to prevent leaks
  • Recharge the system with R134a refrigerant following manufacturer specifications

Quality Assurance and Warranty

The Four Seasons Complete A/C Kit 3121NK comes with a limited lifetime warranty, reflecting the brand's commitment to durability and performance. Each component is manufactured to meet or exceed OEM standards, ensuring reliable operation in Buick Bonneville and Pontiac LeSabre vehicles. This warranty provides added confidence for professional installers and vehicle owners alike.

BrandFour Seasons
Part Number3121NK
PositionComplete A/C Kit
Compressor Oil IncludedIncluded
Compressor Oil TypePAG Oil /150
Expansion Device TypeOrifice Tubes
Gasket / Seals?Included
Kit Includes58994 (New Compressor), 83225 (Accum), 38642 (Orifice), 59003 (Oil), O-Rings
Orifice Dia. IN.062
Orifice Tube ColorYellow
Orifice Tube StyleStandard
Receiver Drier/Accumulator Diameter IN3.500
Receiver Drier/Accumulator Inlet Fitting TypeP-Nut Fitting
Receiver Drier/Accumulator Length IN8.000
Receiver Drier/Accumulator Outlet Fitting TypeP-Nut Fitting
Refrigerant TypeR134a
TypeComplete Air Conditioning Kit w/ New Compressor
WarrantyLimited Lifetime

This part fits 12 vehicles. Search below:

YearMakeModelBody TypeLitersCylindersPositionNotes
2005BuickLeSabreSedan3.8LV6N/Aw/ V5 Compressor; Includes: 58994 (New Compressor), 83225 (Accum), 38642 (Orifice), 59003 (Oil), O-Rings; Complete A/C Kit
2005PontiacBonneville3.8LV6N/Aw/ V5 Compressor; Includes: 58994 (New Compressor), 83225 (Accum), 38642 (Orifice), 59003 (Oil), O-Rings; Complete A/C Kit
2004BuickLeSabreSedan3.8LV6N/Aw/ V5 Compressor; Includes: 58994 (New Compressor), 83225 (Accum), 38642 (Orifice), 59003 (Oil), O-Rings; Complete A/C Kit
2004PontiacBonneville3.8LV6N/Aw/ V5 Compressor; Includes: 58994 (New Compressor), 83225 (Accum), 38642 (Orifice), 59003 (Oil), O-Rings; Complete A/C Kit
2003BuickLeSabreSedan3.8LV6N/Aw/ V5 Compressor; Includes: 58994 (New Compressor), 83225 (Accum), 38642 (Orifice), 59003 (Oil), O-Rings; Complete A/C Kit
2003PontiacBonnevilleN/AIncludes: 58994 (New Compressor), 83225 (Accum), 38623 (Orifice), 59003 (Oil), O-Rings; Complete A/C Kit
2002BuickLeSabreSedan3.8LV6N/Aw/ V5 Compressor; Includes: 58994 (New Compressor), 83225 (Accum), 38642 (Orifice), 59003 (Oil), O-Rings; Complete A/C Kit
2002PontiacBonnevilleN/AIncludes: 58994 (New Compressor), 83225 (Accum), 38623 (Orifice), 59003 (Oil), O-Rings; Complete A/C Kit
2001BuickLeSabreSedan3.8LV6N/Aw/ V5 Compressor; Includes: 58994 (New Compressor), 83225 (Accum), 38642 (Orifice), 59003 (Oil), O-Rings; Complete A/C Kit
2001PontiacBonnevilleN/AIncludes: 58994 (New Compressor), 83225 (Accum), 38623 (Orifice), 59003 (Oil), O-Rings; Complete A/C Kit
2000BuickLeSabreSedan3.8LV6N/Aw/ V5 Compressor; Includes: 58994 (New Compressor), 83225 (Accum), 38642 (Orifice), 59003 (Oil), O-Rings; Complete A/C Kit
2000PontiacBonnevilleN/AIncludes: 58994 (New Compressor), 83225 (Accum), 38623 (Orifice), 59003 (Oil), O-Rings; Complete A/C Kit

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

3121NK520565MK1020

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.