Four Seasons 39700 A/C Expansion Valve - Rear

Rear A/C Expansion Valve for Ford and Lincoln

Four Seasons 39700 is a block-type A/C expansion valve built for rear HVAC service on select Ford and Lincoln models. It is engineered for R134A and R1234YF refrigerant systems and uses aluminum construction with sealing-washer connections for a direct service replacement.

Compatible with rear A/C service on the 2020-2025 Ford Explorer and 2020-2025 Lincoln Aviator, this Four Seasons expansion valve is made to meet or exceed OEM requirements for the application.

Key Features

• Four Seasons Expansion Valve, part number 39700
• Block-type A/C expansion valve for rear HVAC systems
• Aluminum construction
• Works with R134A and R1234YF refrigerants
• Liquid inlet: No. 6 with sealing washer
• Liquid outlet: No. 8 with sealing washer
• Suction inlet: No. 10 with sealing washer
• Suction outlet: No. 10 with sealing washer
• Style: without solenoid
• Meets or exceeds OEM specifications

Product Details

Four Seasons 39700 is an A/C expansion valve for rear climate control circuits in the Ford Explorer and Lincoln Aviator. As a block-style valve, it regulates refrigerant flow into the evaporator to help maintain proper system balance and cooling performance. The part number 39700 is a direct-reference choice for service work where the original valve has worn, restricted flow, or lost control accuracy.

Four Seasons backs this expansion valve with more than 50 years of mobile A/C experience and states that its products are engineered and tested for dependable operation over time. This part cross-references A99586 and L1MZ19849B for the same application.

What It Helps Fix

• Rear A/C cooling that is weak or inconsistent
• Refrigerant metering issues at the evaporator
• Temperature swings in the rear HVAC circuit
• System performance problems caused by a sticking or restricted expansion valve
• Service replacement needs on Ford Explorer and Lincoln Aviator rear A/C systems

Installation Notes

Verify refrigerant type, line sizes, and sealing-washer connections before installation. Replace any damaged seals, evacuate the system, and recharge to the vehicle manufacturer’s specifications after service. Confirm the rear HVAC circuit is clean and free of contamination so the new valve can regulate flow correctly.

Quality Assurance

Four Seasons 39700 is built to meet or exceed OEM requirements and is supported by the brand’s long-standing mobile air conditioning experience. The manufacturer tests its products for reliable, trouble-free operation in automotive HVAC service.