Four Seasons 4187R A/C Compressor and Component Kit

Four Seasons 4187R PAC-Kit w/ Reman Compressor

The Four Seasons 4187R is a PAC-Kit with reman compressor for factory A/C systems that use a York compressor and an internally equalized expansion valve. It is built for select Ford Thunderbird and Mercury Cougar applications from the mid-1970s through 1979.

Key Features

• Part number 4187R from Four Seasons
• PAC-Kit w/ Reman Compressor for A/C service and repair
• For vehicles with factory air and York compressor setups
• Application-specific coverage for internally equalized expansion valve systems
• Fits select Ford Thunderbird and Mercury Cougar models

Fitment Details

• Fits 1978-1979 Ford Thunderbird, N/A, w/ York Compressor; w/ Factory Air; w/ Internally Equalized Expansion Valve; Drier w/ 3 Bracket; 57022 (Reman Compressor), 33377 (Filter Drier), 38863 (Exp Valve), 69991 (Flush), 59007 (Oil); PAC-Kit w/ Reman Compressor
• Fits 1977 Ford Thunderbird, N/A, w/ York Compressor; w/ Factory Air; w/ Internally Equalized Expansion Valve; 57022 (Reman Compressor), 33377 (Filter Drier), 38863 (Exp Valve), 69991 (Flush), 59007 (Oil); PAC-Kit w/ Reman Compressor
• Fits 1974-1977 Mercury Cougar, N/A, w/ York Compressor; w/ Factory Air; w/ Internally Equalized Expansion Valve; 57022 (Reman Compressor), 33377 (Filter Drier), 38863 (Exp Valve), 69991 (Flush), 59007 (Oil); PAC-Kit w/ Reman Compressor
• Fits 1978 Mercury Cougar, N/A, w/ York Compressor; w/ Factory Air; w/ Internally Equalized Expansion Valve; Drier w/ 3 Bracket; 57022 (Reman Compressor), 33377 (Filter Drier), 38863 (Exp Valve), 69991 (Flush), 59007 (Oil); PAC-Kit w/ Reman Compressor
• Fits 1979 Mercury Cougar, N/A, w/ York Compressor; w/ Factory Air; w/ Internally Equalized Expansion Valve; 57022 (Reman Compressor), 33377 (Filter Drier), 38863 (Exp Valve), 69991 (Flush), 59007 (Oil); PAC-Kit w/ Reman Compressor

What This Kit Helps Address

• Weak or inconsistent A/C compressor output
• Noisy compressor operation in York-based factory air systems
• Loss of cooling performance in classic Ford Thunderbird and Mercury Cougar A/C systems
• Service needs tied to an aging compressor, expansion valve, or filter drier setup
• System contamination concerns after compressor failure

Installation Notes

Verify the vehicle uses a York compressor and factory air before ordering. Confirm the expansion valve style and bracket configuration against the vehicle’s original A/C layout, especially on 1978-1979 Ford Thunderbird and 1978 Mercury Cougar applications with a 3-bracket drier. Follow proper evacuation, flushing, and oil service procedures during A/C repair.

Quality Assurance

Four Seasons supplies application-specific HVAC service parts for classic vehicle A/C repairs. Part number 4187R is listed for confirmed fitment on select Ford Thunderbird and Mercury Cougar models with the specified factory A/C configuration.