G-Body

iTrader: (4)

Has anyone with a newer pcm that has the serial data a/c request tried to just hook it up like the express van 12v request to pin 17?

I have an 03 suburban pcm and I`m thinking of giving it a try as HPTuners told me they do not do a/c segment swaps, and no one seems to have found any other solutions. Hopefully they left the programming for either request in the PCM at GM?

ls1nova71

iTrader: (4)

I tried it, or more accuratley, my tuner tried it, and never did get it to work. I lost count of how many times he tried, swapping files from other tunes, ect. In the end, I just bypassed the PCM all together.

arthropraxis

ls1nova71 how do you have your fans controlled and did you have to bump the idle up to compensate for the compressor load?

G-Body

iTrader: (4)

Thats what I`m up against now, I don`t think it will matter in this conversion for the idle speed as its a stocker. But I will probably end up putting a secondary relay in for the fans if I have to go that route.

ls1nova71

iTrader: (4)

On that particular build I used the waterpump mounted clutch fan so it was a non issue, but on my other cars with electric fans, I didn't do anything to increase the idle. It's really not noticable when the A/C comes on because the IAC (or DBW throttle body, if that's what you have) compensates for it pretty quick. Been driving them for years that way with no problems.

I should mention that my electric fan cars, the fans are controlled by the PCM, and also have trinary switches to turn on the fan when the A/C needs them.

arthropraxis

Thanks. Now to get the hoses made.