Universal Air SW6490C A/C Thermostat

Thermostatic A/C Switch for Classic Ford and Mercury

Universal Air SW6490C is a thermostatic switch for the A/C clutch and compressor circuit in select classic Ford and Mercury applications. It is listed for 1965-1966 Ford Mustang, 1967-1971 Mercury Cougar, and 1968-1971 Mercury Montego.

Key Features

• Thermostatic switch for HVAC A/C clutch and compressor control
• Direct fitment coverage for classic Mustang, Cougar, and Montego applications
• Fits 1965-1966 Ford Mustang, N/A
• Fits 1967-1971 Mercury Cougar, N/A
• Fits 1968-1971 Mercury Montego, N/A
• Universal Air part number SW6490C for catalog and service matching

Detailed Description

Universal Air SW6490C is an A/C thermostat used in the HVAC system to regulate compressor cycling based on temperature demand. For owners restoring or servicing a 1965-1966 Ford Mustang, 1967-1971 Mercury Cougar, or 1968-1971 Mercury Montego, this thermostatic switch provides the correct application match for the listed vehicles. The SW6490C part number is useful when cross-checking service records, replacement catalogs, and classic car HVAC components.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Compressor short cycling caused by a faulty thermostat switch
• A/C systems that do not cycle on and off correctly
• Temperature control issues in classic Ford Mustang, Mercury Cougar, and Mercury Montego HVAC systems
• Replacement needs during A/C service or restoration work

Installation Notes and Tips

Verify the existing switch style, connector layout, and vehicle application before installation. Compare the original unit to SW6490C and confirm the HVAC control circuit matches the listed fitment for your Mustang, Cougar, or Montego. After installation, test compressor engagement and cycling to confirm proper thermostat operation.

Quality Assurance

Universal Air identifies this component as a thermostatic switch in the A/C clutch and compressor category, and SW6490C is cataloged for the specific classic vehicle applications shown above.