First where is the location of the pcm that will be replaced in the stage upgrade?

Are the pcms interchangeable?

 

It's under the hood to the right of the engine

 

For stage 3, I think U swap in the stg3 pcm for the stock one/ or the one with the stg 2 on it. I could be wrong tho;. Not 100% sure.

 

For stage two it just reflashes the pcm, stage 3 you get a whole new calibrated pcm.

 

So with the stage 3, you just replace the new pcm with the old one and start it up?? Does anybody know if the stage 3 tune is rich like the stage 2?

 

That what I hear but I just bought both stage 2 and 3 with the option b
The parts dealer said that you can switch pcm as you like with 2 and 3
so that sounds like it fixes the a/c thing

 

I would figure stage 3 is rich too, due to the fact that stage 3 is nitrous ready...

 

wow, thats alot of money to spend to be able to use your a/c with a stage 3

 

all gm performance part
yea its alot but when money is not an issue ill stick to what the professionals have made plus the stage 3 pcm has sweet features that others dont have like switching out of 100 octane or nitro automatically due to any types of knocks that the computer senses

and not to mention the sweet rev limiter

stage 3 all the way baby!!!!