The 2008 Hummer H3 is a relatively easy car to maintain when compared to other similar models. Checking the transmission fluid level is no problem, as the fluid dipstick is reliably accessible in the engine bay. Not every model includes this dipstick. The engine air filter is easy to access, as you only have to disengage a few fasteners for access. These fasteners are easy to disengage. The engine coolant fluid reservoir is easy to check and replenish on this vehicle. This allows you to keep an eye on the fluid level regularly.
Some things are tougher to repair on the 2008 Hummer H3. To access the lower radiator hose, you will have to remove a few panels for access. This will require a few tools, and for you to crawl under the vehicle to complete. The rear wiper blade is difficult to replace, as you will need a tool to complete. This is also a tight fit to replace the blade. To remove the battery, you will first have to remove the terminals, and then remove the battery bracket. This is a slightly different order than usual, and can be confusing for car owners.
Hans Angermeier has produced over 100,000 videos showing drivers how to fix things on their cars. He has broad expertise on basic repair procedures covering the majority of cars on the road.