I recently bought a 08 H3 and my question is: should i feel the 4wheel drive kick in when i engage it? and how can i tell if it is working properly?

 

all 4 wheels are powered at all time. you notice nothing.
keep in 4 hi, the left button. the lock modes are for off road,NOT DRY ROADS.

read the book.!

 

Here is a very basic explination of your 4x4 system;

4 HI 40/60 power split front to rear. More power to the rear. Easier to turn.
4 HI Lock 50/50 power split front to rear. Equal power to both front and rear. Harder to turn. Only use in snow, sand, dirt, mud, etc. NOT ON DRY PAVEMENT!
4 LO Lock 50/50 power split and a much lower (numerically higher) gear ratio. For crawling up/down/over obsticles. Harder to turn. Only use in snow, sand, dirt, mud, etc. NOT ON DRY PAVEMENT!



The owners manual does a pretty great job describing what each m4x4 mode does. If you don't have one I may I suggest you go on Ebay and purchase one. It will tell you all about your vehicle.

 

There was no BOOK or MANUEL that came with my Hummer

 

You can go to hummer.com and download a manual. Click on "OWNERS" then "OWNERS RESOURCES"

 

Or you can even order for one if you like to read on paper.