Where is temperature sending unit on 1987 jeep 4.0 liter Comanche?

The temperature sending unit (also called a coolant temperature sensor) on a 1987 Jeep Comanche with the 4.0L engine is located on the intake manifold. It's usually a single-wire sensor, and it's on the passenger side of the intake manifold, near the thermostat housing.

However, it's *crucial* to visually inspect your engine. The exact location might vary slightly depending on the specific model and any modifications. Look for a small sensor with a single wire connector plugged into it in that general area. A repair manual specific to your year and model will be very helpful in pinpointing it precisely.