Four Seasons 38729 A/C Expansion Valve

Four Seasons 38729 Expansion Valve Overview

The Four Seasons 38729 expansion valve is a brass TXV for R134A air conditioning systems. It regulates refrigerant flow into the evaporator and helps maintain the correct superheat setting for stable HVAC performance.

Built for service work on automotive A/C systems, this Four Seasons Expansion Valve line part is a direct-fit style replacement for vehicles that use a TXV calibrated to 7.5 super heat. It is a practical choice when diagnosing poor cooling, uneven vent temperatures, or refrigerant metering concerns on applications such as Ford F-150 and Chevrolet Silverado.

Key Features

• Four Seasons Expansion Valve line, part number 38729
• TXV design for precise refrigerant metering
• Brass construction
• Configured for R134A refrigerant systems
• 7.5 super heat specification
• Cross-references Dorman - HELP 38729 for the same application

Detailed Description

The Four Seasons 38729 A/C expansion valve controls refrigerant delivery to the evaporator based on system demand. Its TXV design helps maintain proper evaporator feed in R134A systems, supporting consistent cabin cooling and more stable HVAC operation. When replacing a worn or restricted valve, matching the correct super heat specification is important for proper system balance. This part number 38729 is commonly searched for service on Ford F-150 and Chevrolet Silverado HVAC repairs where the original valve uses the same configuration.

Four Seasons uses the Expansion Valve product line for A/C flow restriction applications that require accurate refrigerant control. For buyers comparing replacement options, this valve also cross-references Dorman - HELP 38729 for the same application.

What It Helps Address

• Weak or inconsistent A/C cooling output
• Incorrect refrigerant metering at the evaporator
• Temperature swings from a sticking TXV
• HVAC performance issues after A/C service
• System imbalance caused by a worn expansion valve

Installation Notes and Tips

Verify the vehicle’s refrigerant type, valve style, and super heat specification before installation. Replace the expansion valve only after confirming the rest of the A/C system is clean and free of contamination. Always evacuate and recharge the system according to the vehicle service procedure after replacement. For fitment-based searches, confirm the exact application on Ford F-150 and Chevrolet Silverado models before ordering part number 38729.

Quality Assurance

Four Seasons is a recognized aftermarket brand for HVAC service parts, and this expansion valve is built to meet the listed brass, TXV, R134A, and 7.5 super heat specifications for the intended application.