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Just be aware .. you may have TWO such sensors on your vehicle.
One sensor (usually with 3-4 electrical pins) is near the thermostat and works in conjunction with other sensors to regulate fuel/air according to engine temperature.
The other type of sensor is in the block near the cylinder head. It sends a signal to the temperature gauge on your dashboard ONLY. If your temp gauge constantly reads too hot or too cold .. this one is the culprit.
If it's a running fault .. speed .. rough running .. fuel. It may look like this:
Open up your car manual and turn to the page where there is an illustration of the engine. There you will find the location of the temperature sensor marked in the illustration
This year doen't use a separate sensor for the cooling fans, it uses the ECT (engine coolant temp sensor) sensor that monitors engine temperature for the fuel control system, the computer turns the fans (via a relay) on when the engine reaches about 225-230 Degrees F
coolant temperature sensor is located next to thermostat housing at front of engine in intake manifold you will see it right next to top radiator hose but this one reports to pcm the one for the gauge in dash or light is on the drivers side cylinder head you will see one little wire going to a sensor screwed in head near second plug back on drivers side
Its just above the crankshaft in the center of engine just below the lifters. See a GM dealer parts dept. for pictures af cams and cam sensors. They might fax you a picture.
Most vehicles use a coolant temperature sensor which is located near the thermostat directly connected into the coolant line, or near the thermostat housing, there are relays for the cooling fan which is usually located in the power distribution box under the hood.
Check relays (usually un.derhood) first See owner manual for location. Then check engine coolant temperature sensor. If it's not providing high temp signal, the fans won't come on. However, the fan usually comes on when a/c is engaged. Leaing towards relays
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