Well, this is great! If that xdf is good it solves all my problems!!! Thank you!

I'll try to set up an experiment to determine the value of that unknown capacitor. The engineer in me is itching...

Yes, you are right. I messed up. I have 4 PCM's and bin's and I mis-read the name. Here's the one from the 2004 Sierra that provided the engine I want to put in my 68. Now, what I found from...

Updated my document a bit to clarify a little. I also added the actual circuit for analog AC request as I now know it. I was able to find the "destination" of the C2 pin 17. It goes a chip...

So I opened up both PCM's and looked for differences near C2 pin 17, which is the input for the 12V analog AC request. As you can see in the attached pdf, there are 2 resistors in the Service No....

Thanks so much with your offer to read the bins. Hopefully my attachments work here. Note: the bin labeled "2GTEK.bin" is the one from the donor truck. When I read it, I found the vin didn't match...

I'm not sure that there is a 100% correlation between IAC and analog AC request hardware installation in the Blue/Green PCM's. My reading of various forums says that there is at least a significant...

Quick follow up. The relevant section of lt1swap.com/airconditioning.htm is:

"A/C Request: This is a signal input to the PCM indicating the drivers request for a/c activation. There are two ways...

Thank you for such quick response. I realize that the IAC drivers are unrelated to the AC request function. However, according to LT1SWAP.com, only PCM's with IAC hardware will allow for the Analog...

Hello, not sure if this is the best place to post this question but here goes.
I am going to be swapping a 2004 junkyard LM7 into a 1968 K20 GM truck. I'd like to enable analog AC request. As I...