Universal Air SW3123C A/C Thermostat

Universal Air SW3123C Thermostatic Switch

The Universal Air SW3123C is an A/C thermostat for HVAC systems that use a thermostatic switch to control compressor cycling. It is listed for a broad range of Chrysler, Dodge, and Plymouth applications from 1979 through 1987, including Dodge Caravan, Dodge Ramcharger, and Plymouth Voyager.

Key Features

• Brand: Universal Air
• Brand line: Thermostatic Switch
• Part number: SW3123C
• Category: HVAC > A/C Clutch and Compressor
• Part type: A/C Thermostat
• Direct fitment coverage for select Dodge and Plymouth vehicles
• Application-specific notes included for Ranco cap tube systems on certain models

Fitment Coverage

• Fits 1985-1987 Dodge Caravan, N/A.
• Fits 1986-1987 Plymouth Turismo, N/A.
• Fits 1986 Dodge D100, N/A.
• Fits 1985-1986 Dodge D150, N/A.
• Fits 1985-1986 Dodge D250, N/A.
• Fits 1985-1986 Dodge D350, N/A.
• Fits 1985-1986 Dodge Ramcharger, N/A.
• Fits 1986 Dodge W100, N/A.
• Fits 1985-1986 Dodge W150, N/A.
• Fits 1985-1986 Dodge W250, N/A.
• Fits 1985-1986 Dodge W350, N/A.
• Fits 1985 Dodge 600, N/A.
• Fits 1985 Dodge Aries, N/A.
• Fits 1985 Dodge B150, N/A.
• Fits 1985 Dodge B250, N/A.
• Fits 1985 Dodge B350, N/A.
• Fits 1985 Plymouth Turismo 2.2, N/A.
• Fits 1984-1985 Plymouth Voyager, N/A.
• Fits 1979-1984 Dodge Ramcharger, N/A, with 8in. CAP TUBE RANCO.
• Fits 1979 Dodge W150, N/A, with 8in. CAP TUBE RANCO.
• Fits 1979 Dodge W200, N/A, with 8in. CAP TUBE RANCO.
• Fits 1979 Dodge W300, N/A, with 8in. CAP TUBE RANCO.

Detailed Description

The SW3123C thermostatic switch is used in A/C clutch and compressor control circuits to regulate evaporator temperature and compressor cycling. For owners searching for a Dodge Caravan A/C thermostat, a Plymouth Voyager thermostatic switch, or a Dodge Ramcharger HVAC replacement, this part number provides a fitment-specific solution for listed vehicles and system configurations. The Universal Air Thermostatic Switch line is focused on service replacement for automotive air conditioning systems that rely on a cap tube thermostat arrangement.

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

Common Problems It Can Address

• A/C compressor short cycling
• Evaporator temperature control issues
• Compressor engagement problems tied to thermostat failure
• Inconsistent cabin cooling performance
• System operation issues on Ranco cap tube applications

Installation Notes

Verify the vehicle year, make, model, and system note before ordering. This part is listed for standard N/A positions and, on certain 1979 Dodge and 1979-1984 Dodge Ramcharger applications, requires the 8in. CAP TUBE RANCO configuration. Compare the original thermostat style, cap tube length, and connector layout to the existing unit before installation.

Quality Assurance

Universal Air identifies this part as part of its Thermostatic Switch line for HVAC service applications. Confirm fitment against the listed vehicle and system notes to ensure the correct A/C thermostat is selected for your repair.