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Where is the sensor that controls when electric cooling fan comes on a 1989 jeep Cherokee 4.0 auto?

The 1989 Jeep Cherokee 4.0L with automatic transmission uses a thermostatically controlled switch to activate the electric cooling fan. This switch isn't a separate sensor in the same way an oxygen sensor is; it's *integrated* into the radiator itself.

You'll find it mounted on the radiator, usually near the top or side. It's a temperature-sensitive switch that closes the circuit and turns the fan on when the coolant reaches a specific temperature. It's often a fairly simple looking switch, sometimes with two wires connecting to it.

You might find it easier to locate by following the wiring harness from the cooling fan itself. The wires will lead directly to this switch on the radiator.

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