Who knew there was a forum for Hummer owners. I have a 2006 Hummer H3. I've had it for 11 years now. It's been an awesome truck. I've put very little money into over the years and besides oil changes, brakes, batteries, etc. I've only ever had it in the shop 3 times. Twice for the air compressor which has since been recalled but I can't find anyone in my area to honor the recall for that or the gas cap and once for a sensor. Other than the leaking suroof that gave me a run for my money....I love this truck. Last week I had to replace the radiator. I found the forum when searching for a comprehensive list of things I need to do/replace in order to do a complete tune up so far I'm not finding anything and I was hoping may be someone here maybe had a list or could point me in the right direction. It has 159k miles and hasn't had a tune up.

 

Tune up: Plugs (factory ACDelco only), clean MAF (MAF cleaner only), TB (I use carb cleaner)

I would also swap out ALL the fluids after 11 years. Coolant (sounds like you did that with the radiator swap), brake, steering, transmission, Tcase, and Differentials. The owners manual will have the proper specifications for each fluid. On 06 Tcase you will need to follow the extra step of removing the speed sensor and adding more fluid there.

 

Welcome to HF , you'll find lots of good info here.

 

X2

I use TB cleaner for the TB.