I'm sure it's not the only thing that doesn't work too right? The P411 Tahoe file is the worst OS for the F-Body. Go P59.

 

What does the tune have to do with the A/C not working?

 

The PCM controls the ac clutch. Wrong ac settings prevent it from working.

 

Is there something in HP tuners I can refer my tuner to do?

 

It’s not that simple swapping to a P59 with an LT1 car. The car is running fine tho, besides the A/C. It’s a 1994 Z28 using the plug and play Torque Head kit..

 

I had to go from the 2005 GMT800 system and thus A/C segment to a 2005 Van system and a/c segment to make the ac work in my P59 run 1997 Express. Both are analog input setups.

 

Got it working today thanks!!

 

System segment swap or were you able to swap the ac type setting?

 

Holy crap what a big read. I have a 2000 fbody t56 DBC I just want to run flex fuel, not worried about boost ill go holley eventually. What's needed to run flex fuel while retaining my a/c, cruise and whatnot?

 

Changed the ac type setting

 

Since you have a 2000 you can get the Tahoe OS uploaded, add flex sensor and change the AC setting. If you want the cruise to work also I think you need to P59 swap with the ‘04 GTO operating system. I ripped my cruise out so it wasn’t needed.

 

The Tahoe OS is the worst OS for that purpose.

Don't listen to that. Use a P59 PCM, add a E85 sensor, 2004 Hummer H2 603 OS (the best for f-body, because only the ASR doesn't work instead of everything), and segment swap the Fuel segment with a 2004 Tahoe Flexfuel. Tune it with your stock data/modded data.
That's it.

 

alright well I guess I gota decide if I feel like doing all this and buying a p59 now when i plan on doing a holley terminator soon anyways. Might be pointless 🤣

 

Need to make sure you get a P59 with the IAC chip. Also one could use PCMHammer with Tunerpro to turn on flex fuel, no need to segment swap.