Rain sensor is mouted next to inside rear view mirror assembly on the windshield. The retaining ring is permanantly mounted to windshield. Disconnect connector and pull down on sensor. Do not touch the surface of the sensor.
SOURCE: Location of coolant temperature sensor on 2003 GMC
on the left front of the block by the alt. 4.2 L engine
SOURCE: where is the temperature control sensor located on a 2003 gmc
The engine coolant temperature sensor(ect)is located
on the front of the engine, just above the alternator.
Hope this helps.
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.
SOURCE: Trouble locating cooling sensor on 2003 gmc envoy
4.2L Engine
To Remove:
To Install: 
5.3L & 6.0L Engines
To Remove:
To Install: 
SOURCE: how many 02 sensors does a 2003 GMC Envoy have
A "V" configuration engine, (8 or 6), uses two upper oxygen sensors and either 1 or 2 lower oxygen sensors.
If the vehicle has dual exhaust; dual all the way from the front to the end of the tailpipe, the vehicle will also have two LOWER sensors. But if the two exhaust manifolds converge into one tailpipe, you likely only have 1 lower oxygen sensor.
Check the electrical connections on the new oxygen sensors, and make certain that you have replaced your old sensors with the right type.
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