GM Malibu/Cutlass 1997-2000

Engine Coolant Temperature Sending Unit

Print

OPERATION




CAUTION
Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

The Engine Coolant Temperature (ECT) sensor used by the PCM is also used as the temperature sending unit for the instrument panel. for more information.



Click image to see an enlarged view

Fig. The ECT sensor is a simple thermistor. The units resistance lowers as the temperature increases, causing a higher voltage through the switch

The Engine Coolant Temperature (ECT) sending unit activates a warning lamp in the instrument cluster if the engine starts to overheat. With optional instrumentation, a temperature gauge replaces the warning lamp. The ECT sending unit is not serviceable. If it is faulty, it should be replaced.

The ECT sensor on either engine is located at the thermostat housing.


NOTE
If the pressure in the cooling system is too low, or if the coolant does not contain enough antifreeze, the coolant will boil without the TEMP indicator light coming on.



Click image to see an enlarged view

Fig. This sending unit is also the temperature sending unit for the gauge on the instrument cluster-2.4L engine shown



Click image to see an enlarged view

Fig. The ECT sensor connector on the 3.1L engine, is located on top of the thermostat housing (arrow shows front of vehicle)



Click image to see an enlarged view

Fig. The Engine Coolant Temperature (ECT) sensor for the 3.1L engine is located near the thermostat housing

TESTING



for testing of the Engine Coolant Temperature (ECT) sensor/sending unit.

REMOVAL & INSTALLATION



for removal and installation of the Engine Coolant Temperature (ECT) sensor/sending unit.

 
label.common.footer.alt.autozoneLogo