Four Seasons 39642 A/C Expansion Valve - Front
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Four Seasons
 Expansion Valve

Four Seasons 39642 A/C Expansion Valve - Front

Brand Four Seasons 39642
Position Front
Refrigerant Type R134A
Super Heat 3.000
Type TXV
Product line Expansion Valve
Fits BMW · 10 vehicles

TXV design. Provides precise refrigerant flow control for consistent A/C performance.

R134A compatible. Built for systems using R134A refrigerant.

Superheat set to 3.000. Helps maintain efficient evaporator operation.

Cross-references Four Seasons 39642, UAC EX10322C and 759863 for the same application. See all 6.

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Four Seasons 39642 Expansion Valve

The Four Seasons 39642 A/C expansion valve is a TXV-style HVAC flow restrictor for R134A systems. It helps regulate refrigerant flow into the evaporator so the air conditioning system can maintain proper cooling performance in supported BMW applications.

Key Features

  • Four Seasons Expansion Valve line
  • Part number 39642
  • TXV design for controlled refrigerant metering
  • Built for R134A refrigerant systems
  • Super heat setting: 3.000
  • Direct-fit service part for select BMW HVAC systems

Product Details

This Four Seasons 39642 expansion valve is specified for BMW HVAC service where precise refrigerant control is required. As a thermal expansion valve, it meters refrigerant entering the evaporator based on system demand, helping the A/C system maintain stable outlet temperatures and consistent cooling. It is listed for 1985-1988 BMW 535i, 1988 BMW 535is, 1985-1986 BMW 524td, and 1985-1986 or 1989 BMW 635CSi front applications. This part cross-references UAC EX10322C for the same application.

What It Helps Address

  • Weak or inconsistent cabin cooling
  • Improper refrigerant metering at the evaporator
  • A/C performance issues caused by a worn TXV
  • Temperature fluctuations in R134A HVAC systems
  • Service replacement for select BMW 535i, 535is, 524td, and 635CSi models

Installation Notes and Tips

Verify refrigerant type, system configuration, and vehicle fitment before installation. This valve is listed for front-position BMW 635CSi applications with factory air and for N/A-position fitments on the other supported models. Replace the expansion valve when servicing a restricted, leaking, or non-responsive A/C metering circuit, and inspect related seals, lines, and the evaporator inlet area during service.

Quality Assurance

Four Seasons supplies HVAC service components for automotive air conditioning repairs, and this expansion valve is cataloged to the stated R134A and TXV specifications for the listed BMW applications.

Related reading

This part fits 10 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
1989BMW635CSiFrontFits HVAC Blower Motor Wheel for vehicles with factory air.; Expansion Valve
1988BMW535iN/AExpansion Valve
1988BMW535isN/AExpansion Valve
1987BMW535iN/AExpansion Valve
1986BMW524tdN/AExpansion Valve
1986BMW535iN/AExpansion Valve
1986BMW635CSiFrontFits HVAC Blower Motor Wheel for vehicles with factory air.; Expansion Valve
1985BMW524tdN/AExpansion Valve
1985BMW535iN/AExpansion Valve
1985BMW635CSiFrontFits HVAC Blower Motor Wheel for vehicles with factory air.; Expansion Valve
Directly replaces or cross-references 6 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Four Seasons — 39642UAC — EX10322C7598636451137207764511468475A99524