Join Date: Jun 2009
Location: Beautiful San Dimas, California
I went from behind.
I had to remove the front battery, the tray, remove the bolt for the wiper washer bottle under the tray and the one on the radiator core support so you can move the bottle out of the way. On the passenger's side you have to remove the air box. And, if you run a relay (you should), remove the upper plastic housing that covers the battery cables across the top of the fan shroud.
If you have big hands use someone who has small hands to squeeze through the openings in the radiator header.
It sounds labor intensive, but it only took about 45 minutes to remove everything, wire it up, and put it all back together.
2011 Chevrolet Silverado 2500 HD LTZ Crewcab Duramax/Allison
DPF Delete, MotorOps Tuning, Corsa Muffler
5000K HID Light Kit, Fass 150 Lift Pump
305/55/20 Cooper Zeon LTZ