Vortec HD

iTrader: (1)

Quick E fan questions. I have read many, many posts on this. I know you guys can answer faster. I have a 03 HD. I am going to run stock 05+ E-fans with Stock GM hanress and tune with EFI LIVE.

1: Will these fans work on a HD?
2: Are there instruction out there to show to install the fans and to hook into the PCM (that is where I am having touble)
3: I have a stock 05 Set-up tune for E-fans will the work, or is more tuning needed?

Thanks Guys

OrlandoFL4.8

iTrader: (1)

Here are the directions I got from Derek when I purchased a harness from him, maybe he can hook you up. As far as this working on your truck...not absolutely sure but dont see why not.

Vortec HD

iTrader: (1)

Thanks, once this was installed, you still had to tune the PCM to know you had E-Fas correct.

BlackGMC

iTrader: (31)

Correct! Here are my settings

Vortec HD

iTrader: (1)

I have a 03 Silverado 2500HD 6.0. Does anyone know what size radiator it has in it. I want to use the 05+ Fans but not sure if I need to change out the radiator too.

BlackGMC

iTrader: (31)

99.99% sure you have the 34 incher!! But I would measure it thou, just in case.

budhayes3

iTrader: (19)

Yessir, it's 34"

Vortec HD

iTrader: (1)

Well that saves a little cash. How is the 05+ truck fan mounted ot the radiatior? I know I will need the fans, shroud, and harness. Are there brackets or is it a direct bolt up?

OnyxSilveradoSS

iTrader: (4)

the shroud hold the fans to the radiator, two bolts on the top and rubber bumpers on the bottom.

budhayes3

iTrader: (19)

The fans bolt to the radiator support, the threaded holes should already be there, you just need to get some bolts, but I can't remember the size. It's the same size as the bolts that hold the radiator in though. You can probably find the fans as whole assemblies or factory take outs from places like G&R Auto Parts (google em). That's where I got mine, but that was a few years ago. You could also check ebay. Here's a pic that might help: