I am going to install a high/low switch to turn on the electric fan, what happens if for instance i had it on high and the ecm also turned on the low? would it damage the fan?

In this case i would simply be running 1 wire for each relay, and sourcing a fused 2 amp 12v source. In this case it would be possible for the switch to be in the high or low position and have the ac engage, turning the fan onto high or low automagically per the ecm.

So what would happen? running the fan with both sets of windings sounds like a bad idea to me (this is what would happen, no?) i ask because my wife also operates the crd and i would hate for that to happen.

I know gmctd has done this also and i think he just ran from the relays to his own +12v.

I know i can also switch the ecm's ability to power the relays but i would like to KISS. However i will if i must.

Howdy,

Anyone found GMCTDs writeup on how to install manual control of the electric fan, if spent an hour or so trying to find it and im about to blow a gasket

Help.....

_________________
KJ CRD 2.8L AUTO 2007
BP ULTIMATE
Extra Transmission cooler
2.5 inch full flow muffler.
Fuel Heater Disconnected.
In tank lift pump
Provent
Boost, EGT and Trans temp.
Engine Bay Vents soon.
Transgo Valve body (no resistor)
Hemi TC P04736587AC replaced (original TC P04736582AD in '07 KJ CRD) - Nice -:)

If im not here Im there....

I couldn't find it either but I saved the pictures and descriptions from the original post. Here they are..... I did this mod and it was easy..... I took a three position switch 3 wires and thats it..... Good luck!

Spud

Darn I tried but the pics won't attach??? send me an e-mail and I'll send you the pics.
tjwyklejr@verizon.net

_________________
2005 Silver Liberty CRD Sport
Homemade Provent, GDE Eco-Tune, Aux fan switch

re the wiring capture..... thank you. much appreciated.

_________________
KJ CRD 2.8L AUTO 2007
BP ULTIMATE
Extra Transmission cooler
2.5 inch full flow muffler.
Fuel Heater Disconnected.
In tank lift pump
Provent
Boost, EGT and Trans temp.
Engine Bay Vents soon.
Transgo Valve body (no resistor)
Hemi TC P04736587AC replaced (original TC P04736582AD in '07 KJ CRD) - Nice -:)

If im not here Im there....

The Images From Spud:





Thanks!

Thanks everyone! Images and write-up was just what i was looking for.

I pulled my clutch fan to perform the TB and WP service and installed a Flex-A-Lite 16" fan instead with a thermostat. This is for primary engine cooling. The Intercooler and radiator are separated by over an inch apart so I didn't want to relay on the A/C fan along. Also, you could use the A/C fan separably to aid in intercooler or transmission cooling separate from the radiator cooling. Its there so I wanted to wire it up all at the same time.

Thanks again!

Chris

_________________
2005 Silver CRD Sport
GDE Hot and Tranny Tunes, Suncoast, Trango, Provent, Magnaflow, Cummins Lift Pump, SAMCO, SEGR
Al's A-Arms, Frankenlift w/790+3 clevis rings, 4.10s, Eaton E-Locker, Skid Row & Mopar Skids, RRO Super-Sliders
ARB Bull Bar, KC Daylighters, Rebuilt Warn MX6085 w/125' Synthetic line, 265/70/16 Cooper Discoverer STT & Moabs