Four Seasons 39212 A/C Expansion Valve

Four Seasons 39212 Expansion Valve Overview

Four Seasons 39212 is a block-type A/C expansion valve for R134A systems, built in aluminum for controlled refrigerant metering in the HVAC circuit. It is a direct-fit style replacement for select Mercedes-Benz ML-Class applications, including ML320, ML430, ML500, ML55 AMG, and ML350.

The Four Seasons Expansion Valve line focuses on OE-style service parts for air conditioning repairs. This 39212 valve is a no-solenoid design with captured O-ring connections and a block mounting layout, making it a practical choice for restoring proper refrigerant flow in the Mercedes-Benz ML350, ML500, and related ML-Class platforms.

Key Features

• Part number: 39212
• Brand: Four Seasons Expansion Valve
• Block-type A/C expansion valve
• Aluminum construction and aluminum finish
• Designed for R134A refrigerant systems
• Style: w/o solenoid
• Mounting hole quantity: 2
• Captured O-ring inlet and outlet connections
• Meets or exceeds OEM requirements
• OE cross-reference applications available for select Mercedes-Benz ML-Class vehicles

Detailed Description

Four Seasons 39212 regulates refrigerant flow into the evaporator to help maintain proper A/C system operation. It uses female, insert-style captured O-ring fittings with No. 12 suction inlet and outlet thread diameters, plus No. 6 liquid inlet and No. 10 liquid outlet thread diameters. The valve is specified for 1.300 tonnage applications and is listed with a super heat setting of -0.500. This part cross-references UAC EX10167C and Global Parts Distributors LLC 3411389 for the same application.

Compatible With 1998-2003 Mercedes-Benz ML320, 1998-2001 Mercedes-Benz ML430, 2000-2003 Mercedes-Benz ML55 AMG, 2002-2005 Mercedes-Benz ML500, and 2003-2005 Mercedes-Benz ML350. Use Four Seasons 39212 when servicing the A/C expansion valve on these Mercedes-Benz ML-Class vehicles.

Common Repair Symptoms

• Warm air from the vents with the A/C switched on
• Erratic evaporator cooling or uneven cabin temperatures
• Restricted refrigerant flow through the HVAC system
• Incorrect system pressure readings during A/C diagnosis
• Reduced cooling performance on Mercedes-Benz ML-Class models

Installation Notes and Tips

Verify refrigerant type, fitting style, and mounting layout before installation. Inspect the O-ring sealing surfaces, replace damaged seals as needed, and confirm the system is clean and properly evacuated before recharging. This valve is intended for R134A systems and should be matched to the vehicle’s original A/C configuration.

Quality Assurance

Four Seasons lists this expansion valve as meeting or exceeding OEM requirements. The aluminum construction and OE-style fitment details support accurate replacement service for Mercedes-Benz ML320, ML430, ML500, ML55 AMG, and ML350 applications.