What size engine do you have?
Have you check the temperature sensor?
Also, Chevrolet put out a bulletin to reprogram the PCM because of this.
This is the post.
Some customers may comment on higher than normal engine coolant temperature gauge
readings when operating the vehicle in very high outside ambient temperatures, and in
stop and go or slow moving traffic.
Reduced air flow across the radiator and preheated air from stopped or slow moving
driving conditions from traffic congestion may result in normally higher engine coolant
operating temperatures as indicated by the temperature gauge.
Technicians are to reprogram the PCM with an updated software calibration. This new
service calibration was released with JIS satellite data update version 73 available July 7,
200t As always, make sure your TECH 2(R) is updated with the latest software version
This new calibration win cause the PC?SÃ to command small amounts of additional fan
engagement to control engine coolant temperatures and gauge readings closer to a
customer perception of normal.
A Tech II scan tool will do this, if you cannot get access to one, a dealership will have this. Try this first and let me know.
Monday, July 8th, 2013 AT 4:50 PM