Wow. I just checked back in to see if I had a single reply yet. I was not expecting all of those. Thanks!
I am currently on the market for an older Colorado with the 4cyl/auto/crew cab configuration. I found one down the road that is asking $7k. Needs a little work but solid mechanically.
Here are the things I noticed when I installed one on the Silverado.
1. Opened up the front of the engine for easy maintenance/inspection of all of those parts.
2. The AC was now blowing noticeably colder at redlights during the summer since the fans cycle every time the AC compressor clutch engages.
3. Takeoff from sitting at redlights during the summer was now quiet and had a noticeable power difference during takeoff even with the V8.
4.MPG should be nearly the same at hwy speeds but around town should go up at least 1mpg on hot summer days.
5.The engine gets up to operating temps faster during the winter now. Which reduces engine wear some since they wear slowly at temps above 190degF.
I will take a look at those fans. Funny that I don't own the truck yet. I just always pre-game. This is the time of year to buy if wanting a good deal. I already know what transmission this truck has and what all vehicles it is installed on. I know how much the alternator costs and how much and AC compressor costs, etc.
I know that I should be saving about $1,600 a year in fuel compared to the Silverado if I can get 25mpg with mostly slow hwy cruising.