Four Seasons 4186N A/C Compressor Kit

Four Seasons 4186N A/C Compressor Kit

Four Seasons 4186N is a PAC-Kit with a new compressor for factory air systems using a York compressor. It is built for classic Ford and Mercury applications that need a direct-fit HVAC service solution for the A/C compressor circuit.

Key Features

• Brand: Four Seasons
• Brand line: PAC-Kit with New Compressor
• Part number: 4186N
• For vehicles with factory air and externally equalized expansion valve systems
• Application-specific coverage for York compressor setups
• Includes compressor kit components referenced for the listed vehicle applications

Vehicle Fitment

• Fits 1978-1979 Ford Thunderbird, N/A, w/ York Compressor; w/ Factory Air; w/ Externally Equalized Expansion Valve; Drier w/ 3 Bracket; 58022 (New Compressor), 33377 (Filter Drier), 38864 (Exp Valve), 69991 (Flush), 59007 (Oil); PAC-Kit w/ New Compressor
• Fits 1977 Ford Thunderbird, N/A, w/ York Compressor; w/ Factory Air; w/ Externally Equalized Expansion Valve; 58022 (New Compressor), 33377 (Filter Drier), 38864 (Exp Valve), 69991 (Flush), 59007 (Oil); PAC-Kit w/ New Compressor
• Fits 1974-1977 Mercury Cougar, N/A, w/ York Compressor; w/ Factory Air; w/ Externally Equalized Expansion Valve; 58022 (New Compressor), 33377 (Filter Drier), 38864 (Exp Valve), 69991 (Flush), 59007 (Oil); PAC-Kit w/ New Compressor
• Fits 1978 Mercury Cougar, N/A, w/ York Compressor; w/ Factory Air; w/ Externally Equalized Expansion Valve; Drier w/ 3 Bracket; 58022 (New Compressor), 33377 (Filter Drier), 38864 (Exp Valve), 69991 (Flush), 59007 (Oil); PAC-Kit w/ New Compressor
• Fits 1979 Mercury Cougar, N/A, w/ York Compressor; w/ Factory Air; w/ Externally Equalized Expansion Valve; 58022 (New Compressor), 33377 (Filter Drier), 38864 (Exp Valve), 69991 (Flush), 59007 (Oil); PAC-Kit w/ New Compressor
• Fits 1972-1976 Mercury Montego, N/A, w/ York Compressor; w/ Factory Air; 58022 (New Compressor), 33377 (Filter Drier), 38864 (Exp Valve), 69991 (Flush), 59007 (Oil); PAC-Kit w/ New Compressor

Common Repair Uses

• Restores A/C compressor function on older Ford Thunderbird and Mercury Cougar systems
• Addresses loss of cooling from a worn or failed York compressor
• Helps correct refrigerant flow issues tied to the compressor circuit and expansion valve setup
• Supports service work after contamination or system flushing
• Used when rebuilding factory air HVAC systems on classic Ford and Mercury vehicles

Installation Notes

Verify York compressor configuration, factory air equipment, and externally equalized expansion valve setup before ordering. Match the listed model year and notes exactly, especially for Ford Thunderbird, Mercury Cougar, and Mercury Montego applications. Follow proper A/C service procedures, including system evacuation, flushing, oil selection, and leak checks after installation.

Quality Assurance

Four Seasons is a long-standing HVAC parts brand with application-specific coverage for classic vehicle air conditioning service. Part number 4186N is cataloged for the listed Ford and Mercury fitments.