Four Seasons 38683 A/C Expansion Valve - Front or Rear

Four Seasons 38683 Expansion Valve

Four Seasons 38683 is a brass TXV A/C expansion valve for R134A systems. It regulates refrigerant flow into the evaporator to help maintain stable outlet temperatures and consistent rear A/C performance in a wide range of Ford, Dodge, Chevrolet, GMC, Honda, Jeep, Acura, and Oldsmobile applications.

Key Features

• Brand: Four Seasons Expansion Valve
• Part number: 38683
• Brass construction
• TXV design for precise refrigerant metering
• Configured for R134A refrigerant systems
• Fits rear, front, and N/A-position applications listed in the vehicle fitment data

Product Details

This Four Seasons expansion valve is built for HVAC systems that use a thermostatic expansion valve to control refrigerant delivery at the evaporator. The brass body and TXV design support accurate refrigerant flow management, which is important for maintaining proper A/C performance in vehicles such as the Ford E-150 Econoline, Ford E-350 Super Duty, Chevrolet Blazer, and GMC Jimmy. This part cross-references Monroe Shocks & Struts (e.g., 182105) for the same application.

Four Seasons 38683 is listed across 731 vehicle applications from 1960-2010, including rear A/C and front A/C configurations. It is a direct-fit style replacement for many classic and late-model vans, SUVs, and passenger vehicles that use R134A refrigerant.

Common Problems This Part Can Address

• Weak or inconsistent cabin cooling
• Incorrect refrigerant metering at the evaporator
• Rear A/C performance issues in vans and SUVs
• Temperature fluctuations caused by a worn TXV
• Reduced system efficiency after HVAC service

Installation Notes and Tips

• Verify the vehicle’s refrigerant type is R134A before installation.
• Match the valve to the listed position: rear, front, or N/A as shown in the fitment data.
• Inspect the A/C system for contamination, leaks, and restricted flow before replacing the valve.
• Confirm the compressor and evaporator configuration matches the vehicle-specific notes in the fitment list.
• Use the part number 38683 and the vehicle fitment details to confirm application before ordering.

Quality Assurance

Four Seasons is a recognized HVAC parts brand with broad aftermarket coverage for A/C service applications. Part number 38683 is cataloged as a brass TXV expansion valve for R134A systems, with interchange references including UAC EX5481C and UAC EX6004C for select applications.