Thealien

iTrader: (2)

I know all the 2005 and up trucks had electric fans. Can 2003 and 2004 PCMs be programmed to run electric fans?

I have an issue between where I bought my engine and my harness guy/tuner and I need some information before I go any further

Thanks

busta9876

iTrader: (3)

Yes, all Vortec truck PCM's are capable of controlling electric fans. PCM needs programmed correctly in order for this to happen.

Thealien

iTrader: (2)

Thanks, What I thought

cutlass_455

iTrader: (2)

I cant remember what the pins are, but the truck PCM has one wired already. That one is used for the recirc damper control on the HVAC system in the truck, the Fbody PCM use the same pin for fan control. The other pin the truck PCM is empty and youll have to add it. You have to reprogram the PCM to tell it there is E fans and also make sure that if you are using HP Tuners that you confirm with them that the version of the program you are using makes the change over happen properly.

nastychevelle

iTrader: (7)

pin 42 on the blue connector can be used for fan 1 and pin 33 on the green can be used for fan 2

thats for an 04

cutlass_455

iTrader: (2)

Check out these two threads....


https://ls1tech.com/forums/conversio...lp-please.html

https://ls1tech.com/forums/conversio...n-control.html

Thealien

iTrader: (2)

thanks again

lrazer

heres some info also

http://lt1swap.com/2000harness.htm