Help keep the radiator fan cycling on and off as needed with the Four Seasons Engine Cooling Fan Temperature Switch (MPN 37457), the 1991 Isuzu Stylus switch that senses coolant temperature at the radiator and signals the engine cooling fan to turn on and off. It installs as a direct-fit replacement for the 1991 Isuzu Stylus (see the "Vehicles it fits" section for engine-level applications).
This switch mounts in the radiator and monitors coolant temperature, switching the fan circuit based on coolant temperature so the cooling fan runs when the engine needs it. If a failed temperature switch is the cause of a fan that won't cycle or an engine that runs hot, this replaces it.
- Brass construction for accurate temperature sensing.
- Zinc-coated terminal to resist corrosion.
- Includes the gaskets, o-rings, or seals needed to properly replace the product.
- Vehicle-specific application engineered and tested by Four Seasons for reliable operation.
Backed by over 50 years of Four Seasons mobile A/C experience.
Interchange: 2132601 · 5S1538 · 89054497 · A03857 · SU4284
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
2132601, 5S1538, 37457, 89054497, A03857, SU4284
Frequently Asked Questions
What does this cooling fan temperature switch do?
It senses coolant temperature at the radiator and switches the engine cooling fan circuit on and off based on that temperature.
Does this switch fit my vehicle?
It is a direct-fit replacement for the 1991 Isuzu Stylus. Check the "Vehicles it fits" section to confirm the engine-level application for your vehicle.
What is this temperature switch made of?
It uses brass construction for accurate temperature sensing and a zinc-coated terminal to resist corrosion.
Does it come with seals?
Yes. It contains the gaskets, o-rings, or seals needed to properly replace the product.
Could this switch be why my cooling fan won't turn on?
A fan that won't cycle or an engine that runs hot can be a sign of a failed temperature switch. If the switch is the cause, this replaces it; diagnose the circuit first, as other parts can cause the same symptoms.
