Four Seasons 39454 A/C Expansion Valve
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Four Seasons
 Expansion Valve

Four Seasons 39454 A/C Expansion Valve

Brand Four Seasons 39454
Color Aluminum
Description Expansion Valves
Liquid Inlet Fitting Gender Female
Liquid Inlet Fitting Thread Diameter No. 6
Liquid Inlet Size IN 0.41
Liquid Inlet Size MM 10.5
Liquid Inlet Style Female Insert O-Ring
Liquid Inlet Thread Type Not Threaded
Liquid Inlet Type O-Ring
Liquid Outlet Fitting Gender Female
Liquid Outlet Fitting Thread Diameter No. 8
Liquid Outlet Style Female Insert O-Ring
Liquid Outlet Thread Type Not Threaded
Liquid Outlet Type O-Ring
Lqd Out Size IN 0.540
Lqd Out Size MM 13.6
Material Aluminum
Meets / Exceeds OEM? Yes
Mounting Hole Quantity 2
O-Ring A Number/Desc [24611] / Green O-Ring
O-Ring B Number/Desc [24649] / Green O-Ring
O-Ring C Number/Desc [24622]
O-Ring D Number/Desc [24642] / Green O-Ring
Refrigerant Type R134A
Style w/o Solenoid
Suc In Size IN 0.770
Suc In Size MM 19.600
Suc Out Size IN 0.77
Suc Out Size MM 19.600
Suction Inlet Fitting Gender Female
Suction Inlet Fitting Thread Diameter No. 12
Suction Inlet Style Female Insert O-Ring
Suction Inlet Thread Type Not Threaded
Suction Inlet Type O-Ring
Suction Outlet Fitting Gender Female
Suction Outlet Fitting Thread Diameter No. 12
Suction Outlet Style Female Insert O-Ring
Suction Outlet Thread Type Not Threaded
Suction Outlet Type O-Ring
Super Heat -1.500
Switch Included? Not Included
Tonnage 2.0
Type Block Type
Product line Expansion Valve
Fits Smart · 8 vehicles

OE direct replacement. Meets or exceeds OEM requirements for dependable A/C service.

Aluminum construction. Lightweight material helps resist corrosion in the system.

Block type design. Built as an A/C expansion valve for precise refrigerant flow.

Cross-references Dynomax 39454, Global Parts Distributors LLC 3411530 and UAC EX10418C for the same application. See all 10.

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Four Seasons 39454 Expansion Valve

The Four Seasons 39454 expansion valve is a block-type A/C flow restrictor built for R134A systems and engineered for direct replacement service. It is listed for the 2008-2015 Smart Fortwo and is a common choice when servicing a Smart Fortwo A/C system that needs precise refrigerant metering.

Key Features

  • Brand: Four Seasons Expansion Valve
  • Part number: 39454
  • Block-type A/C expansion valve for R134A refrigerant
  • Aluminum construction with aluminum finish
  • Female insert O-ring liquid and suction connections
  • 2 mounting holes for secure installation
  • Meets or exceeds OEM requirements
  • Application listed for 2008-2015 Smart Fortwo

Product Details

Four Seasons 39454 is an aluminum A/C expansion valve that regulates refrigerant flow into the evaporator to maintain proper system operation. The valve uses female insert O-ring fittings on both the suction and liquid sides, with No. 12 suction inlet and outlet thread diameters and No. 6 liquid inlet with No. 8 liquid outlet thread diameters. It is specified as a 2.0 ton block-type valve with a super heat rating of -1.500 and no solenoid included. For Smart Fortwo A/C repair work, this part number 39454 provides a direct-fit service option for the 2008-2015 Smart Fortwo, N/A position listing.

Four Seasons’ Expansion Valve line focuses on replacement HVAC flow control components for vehicles that use expansion-valve-based refrigerant metering. This part is listed as an OE-spec replacement and is cross-referenced with UAC EX10418C for the same application.

Common Repair Symptoms

  • Weak or inconsistent cabin cooling
  • Incorrect evaporator refrigerant metering
  • A/C system pressure imbalance
  • Compressor cycling concerns related to flow control
  • Reduced cooling performance in a Smart Fortwo A/C system

Installation Notes

Verify refrigerant type, port style, and mounting-hole alignment before installation. Replace the O-rings with the correct A/C seals for the connection points, evacuate the system, and recharge to the vehicle specification after service. Confirm the system is clean and free of contamination before installing the new expansion valve.

Quality Assurance

Four Seasons 39454 is built to meet or exceed OEM requirements for the listed application. It is designed as a replacement HVAC component for service technicians and DIY repairs where accurate refrigerant control is required.

Related reading

This part fits 8 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2015SmartFortwo1.0LL3N/AExpansion Valve
2014SmartFortwo1.0LL3N/AExpansion Valve
2013SmartFortwo1.0LL3N/AExpansion Valve
2012SmartFortwo1.0LL3N/AExpansion Valve
2011SmartFortwo1.0LL3N/AExpansion Valve
2010SmartFortwo——N/AExpansion Valve
2009SmartFortwo——N/AExpansion Valve
2008SmartFortwo——N/AExpansion Valve
Directly replaces or cross-references 10 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Dynomax — 39454Global Parts Distributors LLC — 3411530UAC — EX10418C21745475945480736231312974518350072A17454T39454