Standard Ignition TS-539 Engine Cooling Fan Switch

Engine Cooling Fan Switch for Pontiac LeMans

Standard Ignition TS-539 is an engine cooling fan switch built with a gold finish, male connector, and 2 blade terminals. It is calibrated to trigger at a specified temperature so the fan controller receives the correct signal when cooling demand rises. Fits 1988-1993 Pontiac LeMans, N/A.

Key Features

• Engine cooling fan switch for temperature-based fan control
• Factory-calibrated actuation point for consistent electrical contact
• Formed bimetallic contact arm for precise thermal response
• Custom wax pellet design used to activate the snap-action contact
• Gold color with dichromate finish
• Male connector with 2 blade terminals

Detailed Description

The Standard Ignition TS-539 is engineered for thermal fan control in vehicles that rely on a temperature-sensitive switch to command the cooling fan circuit. Its internal design uses a formed bimetal contact arm and calibrated thermal elements to open and close at the specified lower-temperature set point, helping maintain accurate fan operation. This part cross-references Airtex Fuel Pumps FS203 for the same application. Fits 1988-1993 Pontiac LeMans, N/A, and is a direct-fit service part for Pontiac LeMans cooling system repair work. The TS-539 part number is also commonly referenced in cooling fan switch replacement searches for Pontiac LeMans applications.

Common Problems It Can Address

• Cooling fan not switching on at the proper temperature
• Fan cycling at the wrong time due to a worn thermal switch
• Intermittent electrical contact in the fan control circuit
• Overheating concerns caused by delayed fan activation
• Fault codes or drivability issues tied to fan control signal loss

Installation Notes and Tips

Verify connector style, terminal count, and thread or mounting configuration before installation. Inspect the fan relay, wiring, and controller circuit during replacement so the new switch is not installed into a damaged electrical system. Confirm the cooling system is full and operating correctly after service. For Pontiac LeMans cooling fan switch replacement, match the TS-539 to the original connector and terminal layout before final assembly.

Quality Assurance

Standard Ignition manufactures this switch with controlled materials, factory calibration, and testing to confirm actuation at the specified temperature. The brand’s production process includes component-level and finished-product quality control for thermal switch consistency. The TS-539 part number is built for service replacement use in 1988-1993 Pontiac LeMans cooling system applications.