I havent done an e-fan swap except on some older trucks.

A friend was thinking of putting in e-fans on his '03 5.3

What all is involved? Can I get one from an 05 and basicly slap it in? Do the 03's come pre-wired or do they need to be wired up and add in a temp guage?

 

Its really easy..
Search around on here.. there is a write up somewhere... They are not prewired tho.. A simple wiring harness connected to the PCm and Custom Tune and your set to go..

 

With the '05 fans, the '03 will need a bigger radiator...from 28" to 34".

 

i put the '05 fans on my '03 5.3 also. You will also need get the '05 rad, I just got both from salvage and a nelson harness and it went in easy.