That's what I did...



Actually, I spliced that in because I thought my BB harness wasn't working, but really I just didn't give the truck long enough to warm up and trigger the fans

 

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That is just so awesome!

 

Look at my post. The last part all pertains to dual speed fan control as well as AC if applicable. The thing is you need to tell the PCM you want to run series parallel fans and then switch it from recirculate to #2 fan control.

 

lol, ya no joke.

 

Man I am sorry but that is the funniest thing I have seen all day, Thanks!

 

Oldred, I use HPTuners, so it's a little bit different, but basically the same.

I've already changed the A/C output to Fan#2 control, and setup the Fan#2 temps. I still have no high speed fans. The high speed fan is wired to pin 33 on the red connector, and I'm trying to activate the high speed fans with the HPT interface on the HPT scanner. The low speed is working just fine, high speed---not so much.

If anybody has dealt with making both fan speeds work on a non-a/c truck(controlled entirely by the PCM instead of an over-ride), please post up! Thanks alot.

 

Is your harness setup for AC? Reason i ask, i think if it is then it needs 12v+ to trigger that relay.
If its setup for ground then the pcm should be able to control it

 

Hmm, that could be the issue then. I'll have to try re-wiring that harness, and send the ground wire to the PCM pin 33. Should I bring the 12V to the high speed relay from the low speed relay, or some other source?