Red pin #33

[metalchips]

Hello,
I have a 2002 Sierra 4X4 5.3.---- tuned by Allen.
Question is- does and at what temperature does the PCM red pin #33 activate?
Also Blue pin #42?
I am going to wire up a two speed electric fan and would like to use pin #33 to control one of the fan speeds, though a relays of course.
Is this active in the stock 2002 PCM? Or does it have to be tuned to work?
Thanks

[farmtruc]

All pcm's are programmed to activate fans when we send them out.
So pin 42 will work for sure.
I doubt pin33 is active due to it taking the place of air recirc; despite what ppl suggest, there are still many that want the air recirc operation from the pcm side.
So i leave that alone.
Send erica your info and she'll let you know what temps, probably ON 202, OFF 198 or so.

[metalchips]

Thanks Allen