2005 LQ4 swap from full size van - drive by cable PCM fan?

**efidiy** · 05-22-2014, 10:32 AM

I have this swap almost complete and have a question.

Does the 2005 full size van 6.0 LQ4 PCM OS have the needed code to run an electric fan (if enabled via tuning s/w)?

If so which pin is the output on?

Thanks

**efidiy** · 05-23-2014, 07:21 AM

Does anyone know if this will work?

**Wagonmaster2** · 06-22-2014, 03:13 AM

I have an '03 LQ4 in my '39 Chevy and when moving the computer harness never found a circuit for the fan. These SUV/Truck engines mostly had mechanical fans or manual electrical fans. I installed an electric fan but use a manual switch. May switch it to a thermostat one day but it's been fine this way since I installed the engine in 2007.
Good luck with your project!

**Firebirdjones** · 06-22-2014, 06:48 AM

Yes these truck computers have the ability to run electric fans.

I did a 6.0 swap from a 2005 3/4 ton truck into my 72 blazer and used the trucks computer. I wanted to clean up the front so I ditched the mechanical fan and installed a pair of electric fans from an LS1 Fbody.

I don't remember the pinouts, I had Howell make the custom harness with the correct ends for the LS1 fans so it was all plug and play, and they incorporated the relays in the harness as well. I did tune it myself, and the computer does have the fan tuning section in the HPtuner software to set on/off temps. Worked just like a factory setup.