Keep your cooling fan responding to engine temperature with the Standard Ignition switch TS-121, an engine cooling fan switch for classic Ford and Mercury models. It is a direct-fit replacement for many vehicles, among them the 1980-1986 Ford Mustang, 1983-1986 Ford LTD and 1983-1984 Ford Thunderbird. See the "Vehicles it fits" section for the full list and engine details.
This coolant fan switch senses engine temperature and makes an electrical contact at its specified set point, passing the electrical signal on to the fan controller.
- Calibrated and tested: every unit is calibrated and tested to confirm the switch actuates at its specified temperature.
- Factory-set contact point: each thermal switch is calibrated at the factory to make electrical contact at its specified lower-temperature set point.
- Complete quality control: Standard Ignition, a global manufacturer of original equipment ignition products, maintains quality control throughout manufacturing, from componentry to finished product.
- Built for the shop: a robust design and high-grade materials meet the stringent demands of today's service professional.
Signs this part may need replacing include a cooling fan that never switches on, a fan that runs constantly, or an engine that runs hot at idle or in traffic. Wiring, relays or the fan motor can cause the same symptoms, so diagnose the cooling system before replacing the switch.
Interchange: TFS2 · SW501 · FS100 · E0ZF8B607AA · E0ZF8B607AB · E0ZZ8B607A · 12351530 · 19021191
This part cross-references / interchanges with the following part numbers:
TFS2, SW501, FS100, E0ZF8B607AA, E0ZF8B607AB, E0ZZ8B607A, 12351530, 19021191
Frequently Asked Questions
What does the Standard Ignition TS-121 do?
It is a coolant fan switch. It makes an electrical contact at its specified temperature set point and sends the signal the fan controller uses to operate the engine cooling fan.
Does this LTD switch fit the 1983-1986 Ford LTD?
Yes. The 1983-1986 Ford LTD is a listed application for the TS-121, along with other Ford and Mercury models. See the "Vehicles it fits" section for engine details.
Is this the Thunderbird switch for a 1983-1984 Ford Thunderbird?
Yes. The 1983-1984 Ford Thunderbird is among the listed applications for the TS-121 coolant fan switch.
What are signs a cooling fan switch may need replacing?
Signs include a fan that won't switch on, a fan that runs constantly, or an engine that runs hot at idle. Wiring, relays or the fan motor can cause the same symptoms, so diagnose the system first.
What part numbers does the TS-121 cross-reference?
It interchanges with TFS2, SW501, FS100, E0ZF8B607AA, E0ZF8B607AB, E0ZZ8B607A, 12351530 and 19021191.
