You can "test " the sensor using a DVOM ( digital volt ohm meter) if you have a manual that has the spec, also helps to have an inferred temperature gun to confirm the temp at the sensor.
The coolant temp sensor for a 2003 Passat 1. 8L is located on top of the engine, near the upper radiator hose. It constantly monitors the engine's temperature and adjusts the cooling fan as needed.
In the coolant recovery tank
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The 2003 Toyota Camry coolant temperature sensor can be found on top of the engine. The coolant temperature sensor will be near the center of the exhaust manifold.
behind the oil filter
The 2003 Mazda engine coolant temperature sensor is located on the front of the engine, above the thermostat housing. The sensor will have to wires leading to it.
Where is the coolant temp sensor on the 1998 gmc safari awd
Location of coolant temperature sensor on a 2003 Mercury Grand Marquis?Read more: Location_of_coolant_temperature_sensor_on_a_2003_Mercury_Grand_Marquis
gooble
The coolant temp sensor will be located very close to the thermostst housing.