Calorstat TS2634 Engine Cooling Fan Switch

Engine Cooling Fan Switch for Audi and Volkswagen

Calorstat TS2634 is an engine cooling fan switch with a two-speed temperature strategy for vehicles that use an M22x1.5 threaded sensor location. It switches fan operation at 87/79 and 93/85, helping manage coolant temperature in a wide range of Audi, Volkswagen, and Porsche applications.

Fits 1980-2003 Audi and Volkswagen models listed below, including Audi A4, A6, A8 Quattro, and Volkswagen Passat applications. This part cross-references Monroe Shocks & Struts (e.g., 5626) for the same application.

Key Features

• Part number TS2634 engine cooling fan switch
• Two-speed operation with Speed 1 at 87/79 and Speed 2 at 93/85
• M22x1.5 thread size for the specified cooling system port
• Direct-fit style replacement for listed Audi, Volkswagen, and Porsche applications
• OE-supplier context noted for Audi and Volkswagen fitments

Detailed Description

Calorstat TS2634 is an engine cooling fan switch used to control radiator fan engagement based on coolant temperature. The dual-stage switching points provide separate on and off thresholds for low and high fan speeds, which is important for maintaining stable operating temperature in vehicles that rely on a two-speed cooling fan circuit. Common fitments include Audi A4, A6, A8 Quattro, 90, 100, 200, and S4 models, along with Volkswagen Golf, Jetta, Passat, Corrado, Vanagon, and related applications. Porsche 924, 944, 968 fitments are also listed with shut-off points of 79 °C and 85 °C.

What It Helps Address

• Cooling fan not switching on at the correct temperature
• Fan staying on longer than expected after warm-up
• Inconsistent engine temperature control in stop-and-go driving
• Overheating concerns tied to a faulty fan temperature switch
• Loss of proper two-speed fan control in the cooling circuit

Installation Notes and Tips

Verify the thread size is M22x1.5 before installation and confirm the vehicle uses a two-speed fan control strategy. Match the temperature thresholds to the original application, especially on Audi A4, Audi A6, Volkswagen Passat, and Porsche 944/968 fitments. Always compare the existing switch connector, mounting location, and cooling system specification before replacement. The part number TS2634 should be checked against the original unit and vehicle service information for final confirmation.

Quality Assurance

Calorstat is listed as an OE supplier to Audi and Volkswagen for many of the covered applications, supporting application-specific fitment confidence. Use the vehicle fitment data and temperature specifications to confirm the correct replacement before installation.

• Fits 1997-2003 Audi A8 Quattro, N/A
• Fits 2001-2003 Audi S8, N/A
• Fits 1996-2001 Audi A4, N/A
• Fits 1996-2001 Audi A4 Quattro, N/A
• Fits 1998-2001 Volkswagen Passat, N/A
• Fits 1990-1994 Volkswagen Passat, N/A
• Fits 1998-1999 Audi A8, N/A
• Fits 1995-1998 Audi A6, N/A
• Fits 1995-1998 Audi A6 Quattro, N/A
• Fits 1994-1998 Audi Cabriolet, N/A
• Fits 1993-1995 Audi 90, N/A
• Fits 1988-1991 Audi 90, N/A
• Fits 1993-1995 Audi 90 Quattro, N/A
• Fits 1988-1991 Audi 90 Quattro, N/A
• Fits 1992-1995 Porsche 968, N/A
• Fits 1989-1994 Audi 100, N/A
• Fits 1989-1994 Audi 100 Quattro, N/A
• Fits 1992-1994 Audi S4, N/A
• Fits 1985-1994 Volkswagen Golf, N/A
• Fits 1980-1994 Volkswagen Jetta, N/A
• Fits 1985-1993 Volkswagen Cabriolet, N/A
• Fits 1990-1993 Volkswagen Corrado, N/A
• Fits 1992-1993 Volkswagen EuroVan, N/A
• Fits 1987-1993 Volkswagen Fox, N/A
• Fits 1988-1992 Audi 80, N/A
• Fits 1988-1992 Audi 80 Quattro, N/A
• Fits 1989-1991 Audi 200, N/A
• Fits 1989-1991 Audi 200 Quattro, N/A
• Fits 1990-1991 Audi Coupe Quattro, N/A
• Fits 1985-1991 Porsche 944, N/A
• Fits 1983-1991 Volkswagen Vanagon, N/A
• Fits 1986-1988 Audi 5000 Quattro, N/A
• Fits 1987-1988 Porsche 924, N/A
• Fits 1982-1988 Volkswagen Quantum, N/A
• Fits 1985-1987 Audi 4000, N/A
• Fits 1985-1987 Audi 4000 Quattro, N/A
• Fits 1985-1987 Audi Coupe, N/A
• Fits 1984 Volkswagen Rabbit Convertible, N/A
• Fits 1980-1983 Volkswagen Rabbit Pickup, N/A