Where is coolant temp sensor located on 2003 gmc envoy v6? How do you replace it?

No! there is nothing to reprogram. The sensors in the coolant system and the temp sensor for the fans dont need to have anything done to them. If you are not getting any check engine light, you are good.

More than likely the thermostat is stuck open. You should replace the thermostat and the temp sensor. See picture below for location.

Hi there:
The Coolant Temperature Sensor location on 2000-2005 4.8L, 5.3L, 6.0L engines is in the head driver side, above the plug.



Additionally, this video also could help you...



Hope helps.

The intake air temp sensor is located in the induction tube between the air filter box and the throttle body.

If you are getting the low coolant message you are looking for the coolant level sensor not the coolant temp sensor. I do believe the sensor is in the jug, is it filled to the full line?

There are 4 O2 sensors. 2 are located before each catalytic converter and 2 are located after the converters.

The engine coolant temperature sensor(ect)is located
on the front of the engine, just above the alternator.
Hope this helps.

COOLANT TEMP SENSOR IS MOST LIKELY BAD. NEED TO CONNECT TO THE OBD CONNECTOR WITH A COMPUTER AND SEE WHAT TEMP THE COMPUTER IS SEEING.

The sensor is located on the drivers side engine block...although you can see if from looking from the top of the engine, you would have to get under the vehicle and look up to replace it. Be aware that it takes a special tool to unscrew the old one and screw in the replacement.

That code represents a lower than expected reading for temperature (coolant). First thing to do is check your coolant level, as if it is low, then the sensor can not read correctly. Second, you may have a thermostat that is stuck open, allowing the coolant to cool off too much. The sensor should be mounted on top of the engine, near the thermostat housing.