Four Seasons 39653 A/C Expansion Valve

Four Seasons 39653 Expansion Valve Overview

Four Seasons 39653 is a block-type A/C expansion valve for R134A systems, built from aluminum with sealing-washer connections and a two-hole mounting pattern. It is an OE-style replacement that meets or exceeds OEM requirements for the listed applications, including Mercedes-Benz CLS and GLK models.

The Four Seasons Expansion Valve line focuses on accurate refrigerant control at the evaporator, helping maintain proper system balance in serviceable HVAC repairs. Part number 39653 is specified as a no-solenoid valve with a -5.000 super heat setting and 1.500 tonnage rating.

Key Features

• Four Seasons 39653 A/C expansion valve for R134A systems
• Block-type aluminum construction
• Female inlet and outlet fittings with sealing washers
• Two mounting holes for direct replacement fitment
• No solenoid design
• Meets or exceeds OEM specifications
• Cross-reference: UAC EX529509C

Detailed Product Description

This expansion valve regulates refrigerant flow into the evaporator to support stable A/C performance in properly serviced systems. The aluminum body, sealing-washer connection style, and female threaded ports are specified for the listed Mercedes-Benz applications, including 2018 Mercedes-Benz CLS400, CLS500, CLS550, and CLS63 AMG S, plus 2011 Mercedes-Benz GLK300 and GLK350. If you are replacing a Mercedes-Benz CLS expansion valve or a Mercedes-Benz GLK A/C expansion valve, Four Seasons 39653 provides the correct OE-style configuration for those vehicles.

Part number 39653 is also referenced in aftermarket interchange listings and is commonly searched as a replacement A/C expansion valve for Mercedes-Benz CLS400, CLS500, CLS550, CLS63 AMG S, GLK300, and GLK350 HVAC repairs.

Common Repair Symptoms

• Weak or inconsistent cabin cooling
• Incorrect evaporator refrigerant metering
• A/C performance issues after compressor or evaporator service
• System imbalance caused by a worn or restricted expansion valve
• Temperature fluctuations during normal A/C operation

Installation Notes

Verify the refrigerant type, port sizes, and mounting style before installation. This valve uses female suction and liquid connections with No. 12, No. 10, No. 8, and No. 6 thread diameters as listed, so matching the original hardware and line configuration is important for proper sealing. Replace sealing washers as needed during service, evacuate the system, and recharge to the vehicle specification after repairs.

Quality Assurance

Four Seasons 39653 is listed as meeting or exceeding OEM requirements for the confirmed applications. The part is built for the specified Mercedes-Benz fitments and follows the Four Seasons Expansion Valve product line standards for HVAC service parts.