you shouldn't need to unless it set a check engine light for some reason. if it was just a compressor change for, say, the compressor locked up then no. hope this helps.
How do you reset the computer in a 04 blazer 4.3L
disconnect the battery
When you change the battery you automatically reset the PCM. Any time you remove the negative battery cable for about 15-20 minutes you will reset the PCM. This will reset your Check engine light also. www.trailvoy.com Trailblazer enthusiasts forum with all the answers for your Trailblazer.
remove negative and positive cables from battery, touch cables together for 30 seconds and then reconnect.....will be reset.
How do I reset the service engine light on a 2003 Chevy Trailblazer?
you have to remove neg.batt cable for 1 minute.may have to do a couple of times to reset ac controller
I had the same problem, Just disconnect the battery power for 8 seconds, this will reset the computer, then reconnect the battery this should get the message to erase and your AC should work. This worked for me on a 96 SLS. Adam Quiroz
To reset a refrigerator compressor, unplug the refrigerator for about 5 minutes and then plug it back in. This can help reset the compressor and potentially resolve any issues it may be experiencing.
disconnect both terminals from the battery, then touch the terminals together, not connected to the battery, voila! you're done.
The best and fastest way to reset the instrument panel of 2004 Trailblazer is to disconnect both battery terminals. Reconnect them after about 30 minutes and everything should be reset.
1st repair the problem 2nd Use the scanner to clear the codes set in the computer system
This is a dealer item. They can reset it.