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The thermostat is located on the engine on a 1998 GMC Sierra 1500 standard. The thermostat can be found by following the upper radiator hose directly to the thermostat,
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The 2002 GMC Sierra: temperature sensor is located on the front of the engine. The sensor will be just above the thermostat housing.
you dont
You remove the old thermostat and install a new one.
The thermostat on a 2000 GMC Sierra 5.3L K1500 is located at the engine side of the LOWER radiator hose NOT the upper as many on these forums suggest. The thermostat can be fairly easily replaced as the thermostat comes WITH the housing and has an included gasket [Stant part# 14298 sorry Chinese price $26.95]. Regards!
4l60 non electric