Electric fan upgrade

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05-20-2008, 01:43 PM

#21

RotaryResurrection

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I tow **** all the time with my ls6 denali with the 04+ truck e-fans, hundreds of miles at a time, and it never gets above 200 on the stock gauge. Hell, for that matter, I have never seen it get TO 200 on the stock gauge.

I do have one of those laser thermometer deals, maybe one day when I am bored I will verify the stock gauge's calibration with it.

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05-20-2008, 01:52 PM

#22

BlackGMC

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Quote:

Originally Posted by 12secSS

Not on 1999-2002 models you can't. 2003-2004 can simple enable the E-Fans with a simple flash of the computer. The pins required to operate the e-fans (lo and hi speed) on 2005+ models are not used on 2003-2004 models. 1999-2002 models use the pin to command the hi fans to come on, for the HVAC control ... the pin used to command the lo speed e-fans is not used on these early models. So for those trucks it is not as simple (unless you just tap into the A/C enable). Also, it is not adviseable to flash a newer file to an older ECM, there could be compatability issues.

I believe it will work on all model year of trucks, you just disable teh HVAC reciruculate and enable that pin for efan operation... Teh HVAC recirculate is only used on electronic climate controled trucks... Several guys on GMFullsize did it with the early year model trucks with no problems and on EFI Live... You just have to cut the wire that goes into that pin and use it for the fans... Don't forget to change G0106 to "Fan #2 control"...