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.
Yeds you sometimes should because the sensors in the coolant and temp sometimes are used to the regualar so you should
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SOURCE: How to replace the headlights on my 2003 GMC envoy.
The headlights on the envoy are the easiest parts of the car to repair. You just pull the two tabs at the top of the headlights, screw out the bulb containers and you are good to go
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: 2002 GMC envoy slt 4.2
Sounds like you may have disconnected the battery. Does the rough idle only happen when the defroster or A/C is on? If so clean your throttle body with throttle body cleaner with the battery disconnected. When finished, drive it for 5 or so miles with the defroster / AC off to let the computer relearn the settings. This will solve your problem.
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