On the 05 4.2 it is tucked behind the alternator and difficult to see unless you are standing on the driver's side.
Coolant Temperature Sensor/Switch (For Computer)Engine, Left Front
It is on the drivers side of the block.
It is located behind the alternator just above the thermostat. You will need to take the alternator off to be able to reach and change the sensor.
The ambient temperature sensor is located behind the front grill.
Engine coolant Sensor is bad. I have the same error on my 2005.
behind the alternator on the motor block.
Between the front grill and the radiator.
what cause a 2006 gmc envoy Denali to cut off wile driving
where is the map sensor located on a 2005 gmc envoy
Behind the grill top drivers side. Little grey thing with a green connector.
Mas air flow sensor
It is located behind the alternator on my 2004 and would think would be the same for yours. Kind of a pain to get at due to a plastic wire raceway that is partially in the way and a few other items need to be removed to take off the alternator. Now that I changed my sensor my thermostat needs to be replaced. Ron