Keep coolant temperatures in check with the Standard Ignition Engine Cooling Fan Switch TS-108 — a thermal switch that signals the cooling fan circuit to turn on when the coolant reaches its calibrated set point. It installs as a direct-fit replacement for the 1968-1977 FIAT 124, 1971-1977 FIAT 128, 1975-1978 FIAT 131, and 1974-1978 FIAT X-1/9; see the Buyer's Guide tab for engine-level fitment.
- Wax-actuated design: a custom wax formulation expands when heated, activating a snap-action electrical contact that transfers the signal to the fan controller.
- Factory-calibrated: the wax pellets are formed for the specified temperature range, then calibrated and tested to confirm switch actuation, making electrical contact at the specified lower-temperature set point.
- Bimetallic contact arm: built with a formed bimetallic arm whose movement comes from the different expansion rates of two fused metals — a creep-action device for precise performance.
- Built to endure: robust design and high-grade materials meet the stringent demands of today's service professional.
If a failed fan switch is the cause of a fan that won't cycle on, this replaces it; diagnose the circuit before installing.
Interchange: 60549313 · TFS514 · FS163 · 4114572 · 4235333 · 4263597 · 4318331 · 4318831 · 4340878 · 82280950 · 82286103 · 01610460
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does the TS-108 cooling fan switch do?
It's a thermal switch that closes an electrical contact when the coolant reaches its calibrated set point, signaling the fan controller to turn the cooling fan on.
Which vehicles does this switch fit?
It's a direct-fit replacement for the 1968-1977 FIAT 124, 1971-1977 FIAT 128, 1975-1978 FIAT 131, and 1974-1978 FIAT X-1/9. Check the Buyer's Guide tab for engine-level details.
How does the switch activate the fan?
A custom wax formulation expands when heated and triggers a snap-action contact, while a formed bimetallic arm uses two fused metals' expansion rates for precise creep-action movement.
Is each unit tested before shipping?
Yes. All units are factory-calibrated and tested to confirm switch actuation at the specified temperature, making contact at the specified lower-temperature set point.
My cooling fan won't turn on — will this fix it?
If a failed fan switch is the cause, this replaces it. A fan that won't cycle can have other causes, so diagnose the circuit before replacing the switch.
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