Four Seasons 39254 Block Type O-Ring A/C Expansion Valve

The Four Seasons 39254 is a block type A/C expansion valve with O-ring fittings, engineered as a direct replacement for failed or underperforming thermostatic expansion valves (TXV) in automotive air conditioning systems. As a critical component of the A/C refrigerant circuit, the expansion valve precisely meters refrigerant flow into the evaporator to maintain optimal system performance and cabin comfort.

Key Features:

• Block-type design with O-ring fittings for a secure, leak-free connection
• Engineered to meet or exceed OE fit, form, and function requirements
• Precision-machined ports for accurate refrigerant metering and consistent superheat control
• Calibrated to each application's tonnage, superheat, and maximum operating pressure (MOP) specifications
• Includes application-specific O-rings, gaskets, and seals for a complete installation
• Manufactured by Four Seasons, the largest aftermarket climate control parts supplier in the industry
• Backed by in-house R&D and quality validation for long-lasting, trouble-free operation

Four Seasons expansion valves are tested and validated to ensure your A/C system delivers reliable, efficient cooling. Installing the correct, properly calibrated TXV is essential — a misapplied or low-quality valve is a leading cause of A/C performance issues.