Four Seasons 39139 A/C Expansion Valve - Rear

Four Seasons 39139 Expansion Valve

Four Seasons 39139 is a brass TXV A/C expansion valve for R134A systems. It regulates refrigerant flow into the evaporator to help maintain stable cooling performance in the rear HVAC circuit.

Key Features

• Brand: Four Seasons Expansion Valve
• Part number: 39139
• Brass construction
• TXV design for R134A refrigerant
• Rear A/C flow restrictor application

Product Details

This Four Seasons expansion valve is built for rear HVAC service on 1999-2002 Mercury Villager and 1999-2002 Nissan Quest models. The TXV design meters refrigerant into the evaporator based on system demand, helping the rear air conditioning circuit operate with proper flow control. This part cross-references UAC EX10087C for the same application. Four Seasons 39139 is a direct-fit service part for rear A/C repair on Mercury Villager and Nissan Quest vehicles within the listed years.

Common Repair Symptoms

• Rear A/C vents blowing warm air
• Erratic evaporator cooling performance
• Restricted refrigerant flow at the rear HVAC circuit
• Improper system pressure balance in the rear A/C loop

Installation Notes

Verify the vehicle uses an R134A system and confirm rear-position fitment before installation. Replace the expansion valve during A/C service when the system has been opened, contaminated, or shows signs of flow restriction. Always evacuate and recharge the system according to factory procedures after repair.

Quality Assurance

Four Seasons is an established HVAC parts brand with a broad catalog of replacement components for automotive climate control service. Part number 39139 is specified for the listed rear applications and built to support proper refrigerant metering in the A/C system.