i just got my wire harness in for my lt1 fans ive had forever and never installed. just wondering if i install them tomorrow, will it cause problems till i get it tuned? or will it just set off the check engine light?

 

shouldnt set of any codes, but you will need to run them off the pcm if you plan to have them turn on/off at certain temps. or you can rig up a switch to run them now. imo i would run them off the pcm and have a ground switch to override them when wanted. thats how mine are set up.

 

I just did mine and until i got my pcm I just touched the 12v ac wire with the 42pin wire and let them run the whole time until i got them in. No codes hell i didn't even take my other fan off until i got the pcm i was rollin with 3 fans lol.

 

tune is not required at all. autostores sell tstats for efans that go through the radiator.

 

no tune i just got the harness from summit

 

i got it from nelsons and it looks like it doesnt need to be tuned so im gonna go tear the truck apart and hope im right. haha

 

glad i messaged allan 1st at nelsons. he says i need to tune. now im just confused. haha

 

Having the PCM tuned to turn on the fans is the best way IMO. The other options are 1) the aftermarket temp controllers (like the one made by Flex-A-Light), but they've been known to short and burn up pre-maturely, 2) a manual toggle switch that you control...but then you've got to really keep your eyes on your temp guage and be on your toes, or 3) wire the fans to run constantly which may make the engine take a long time to reach operating temp, and may cause the fan motor(s) to burn out pre-maturely from always being on, even when it isn't necessary.

Personally, I opted for having my PCM tuned and I'm very happy with the results.