Four Seasons 38901 A/C Expansion Valve - Rear

Four Seasons 38901 Expansion Valve

Four Seasons 38901 is a block-type A/C expansion valve built for R134A systems and aluminum HVAC plumbing. It is an OE-style replacement for vehicles that need precise refrigerant metering, including Jeep Cherokee, Jeep Comanche, Jeep Wagoneer, Ford F-100, and Ford F-150 applications.

Key Features

• Block-type A/C expansion valve for R134A refrigerant systems
• Aluminum construction with aluminum finish
• Female O-ring suction and liquid connections
• Super heat setting: 8.000
• Meets or exceeds OEM requirements
• Designed for 1.5 ton HVAC applications
• Style: w/o solenoid

Product Details

The Four Seasons Expansion Valve line focuses on accurate refrigerant flow control for automotive air conditioning systems. Part number 38901 uses a block-style design with female O-ring fittings and the specified thread sizes for suction and liquid ports, helping restore proper A/C system balance in factory-style HVAC layouts. This part cross-references Dorman - HELP (e.g., 91012) for the same application. Common fitment includes 1986-1990 Jeep Cherokee, 1986-1990 Jeep Comanche, 1978-1979 Ford F-150, and 1973-1979 Ford F-250. Four Seasons 38901 is also listed for 1974-1980 Jeep Wagoneer and 1971-1973 Ford Mustang factory-air applications.

What It Helps Fix

• Warm air from the vents caused by poor refrigerant metering
• Erratic evaporator performance in R134A A/C systems
• Restricted or uneven refrigerant flow through the HVAC circuit
• Loss of cooling efficiency in block-style expansion valve setups
• System performance issues after replacing other A/C components

Installation Notes and Tips

Verify the vehicle uses a block-type expansion valve with the listed O-ring port sizes before installation. Match the suction and liquid inlet/outlet thread dimensions to the original HVAC connections, and replace sealing surfaces as needed during service. Confirm the system is charged with R134A and inspect the receiver drier, compressor, and evaporator for contamination before final assembly. Fits 1986-1990 Jeep Cherokee, 1986-1990 Jeep Comanche, 1974-1980 Jeep Wagoneer, 1978-1979 Ford F-100, and 1978-1979 Ford F-150 exactly as listed in the fitment data.

Quality Assurance

Four Seasons 38901 is engineered to meet or exceed OEM specifications for the listed applications, supporting consistent A/C system operation in compatible factory-style setups.