In all of the documentation I have found the ECT sensor on the Atlas i6 4.2L (Vortec 4200) is suppose to be drivers side of the block, behind the alternator, under the wiring loom, next to the thermostat.
Get more help on-HP Error Code 0xc05d1281
SOURCE: Location of coolant temperature sensor on 2003 GMC
on the left front of the block by the alt. 4.2 L engine
SOURCE: cooling fan relay location on a 2005 gmc sierra
If air is hot then cold it sounds like you have a sizable air pocket in the cooling system. This could be caused by a leak or if you have recently done anything to the system without bleeding it afterward.
SOURCE: check engine light....coolant temperature sensor
take altanator off and it is located right behind
SOURCE: where is coolant temp sensor located on 2003 gmc
heres a diagram to show you where the coolant temp sensor is located, its behind the alternator on the left side (driverside),the sensor just unplug the connector and then unscrew it and out it comes.
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