Four Seasons 38908 A/C Expansion Valve - Rear

Four Seasons 38908 Expansion Valve for Rear A/C

Four Seasons Expansion Valve 38908 is a brass TXV built for R134A air conditioning systems. It regulates refrigerant flow at the rear HVAC circuit to help maintain proper evaporator performance in supported applications.

Key Features

• Brand: Four Seasons Expansion Valve
• Part number: 38908
• Type: TXV thermal expansion valve
• Color/material: Brass
• Refrigerant type: R134A
• Rear A/C flow control component

Product Details

This Four Seasons 38908 expansion valve is used in rear HVAC systems that require precise refrigerant metering. As a TXV, it helps control refrigerant entering the evaporator based on system demand, supporting stable cooling performance in vehicles equipped with rear air conditioning. It is listed for 1994-2005 Chevrolet Astro rear and 1994-2005 GMC Safari rear applications. This part cross-references Carlson 17416 for the same application.

What It Helps Address

• Rear A/C vent air that is warmer than expected
• Erratic evaporator refrigerant feed
• Reduced cooling output in the rear HVAC circuit
• System performance issues tied to a worn or restricted expansion valve
• Service replacement needs on Chevrolet Astro and GMC Safari rear A/C systems

Installation Notes and Tips

Verify the vehicle uses R134A refrigerant and a rear TXV-style expansion valve before ordering. Match the valve to the original system layout and inspect related A/C components for contamination, leaks, or restriction before reassembly. Proper evacuation and recharge procedures are required after service.

Quality Assurance

Four Seasons supplies HVAC service parts for automotive A/C repair, and this expansion valve is built to meet the application requirements listed for the Chevrolet Astro and GMC Safari rear systems.