H3 Hummer

Welcome H3 Hummer Owners!

Here I have list PDF, part recommendations, Forums Support, and more for the GM H3 Hummer, aka Little Monster. If you feel that I’m missing something, please don’t hesitate suggesting it to me.

The only Hummer Forum I recommend
Schwarttzy.com H3 Hummer Off-Road Parts
Aftermarket Parts I recommend
List of PDF files for the H3 Hummer

Hummer H3 – Airbags
Hummer H3 – Anti-lock Brake System
Hummer H3 – Automatic Transmission
Hummer H3 – Bolted Exterior Body Panels and Closures
Hummer H3 – Bumpers & Fascias
Hummer H3 – Cellular, Entertainment and Navigation
Hummer H3 – Clutch
Hummer H3 – Cruise Control
Hummer H3 – Disc Brakes
Hummer H3 – Displays & Gages
Hummer H3 – Electrical Components
Hummer H3 – Engine Exhaust
Hummer H3 – Engine Cooling
Hummer H3 – Engine Mechanical 3.5L
Hummer H3 – Engine Mechanical 3.7L
Hummer H3 – Engine Mechanical 5.3L
Hummer H3 – Exterior Trim
Hummer H3 – Fixed & Moveable Windows
Hummer H3 – Frame & Underbody
Hummer H3 – Front Drive Axle
Hummer H3 – Front Suspension
Hummer H3 – Getting to Know
Hummer H3 – Horns
Hummer H3 – HVAC 2
Hummer H3 – HVAC
Hummer H3 – Hydraulic Brakes
Hummer H3 – Interior Trim & Paneling
Hummer H3 – Lighting
Hummer H3 – Maintenance & Lubrication
Hummer H3 – Manual Transmission
Hummer H3 – Mirrors
Hummer H3 – Owners Manual
Hummer H3 – Parking Brake
Hummer H3 – Power Seats
Hummer H3 – Power Steering
Hummer H3 – Propeller Shaft
Hummer H3 – Rear Drive Axle
Hummer H3 – Rear Suspension
Hummer H3 – Seat Heating and Cooling
Hummer H3 – Service Reminder Indicators
Hummer H3 – Steering Wheel & Column
Hummer H3 – Sunroof
Hummer H3 – Transfer Case
Hummer H3 – Vehicle Access
Hummer H3 – Wheel Drive Shafts
Hummer H3 – Wipers & Washers
Hummer H3 – Wiring 2006
Hummer H3 – Wiring 2007
Hummer H3 – Wiring 2008

  1. Wish I could have found these links yesterday. Just got done replacing my A/C condenser and it would have gone much smoother had I had it. Oh well, it’s good to know that I got it out and back in the correct way! Thanks for posting these – you’ve been bookmarked!

  2. Thanks for all this info! It is a great reference since there really isn’t a 3rd party repair manual out there! Your awesome!

  3. Chadag93 Dude you are the bomb! Thanks for all this information. getting diagrams almost takes an act of congress! Thanks so much !!!

  4. Just want to say thanks. My H3 is a 2008. In your opinion, can I use this 2007 info, or should I not even try? Thanks again brother.

  5. This is awesome! I am going to be placing my order for your aux in. Thank you so much! You just saved me a ton of money on a new radio! The information is also very helpful since I have to track down some wiring issues!

  6. Hello,

    I am hoping to find a solution to my H3 that keeps shutting down as soon as I start the ignition, in a second. Something to do with the anti-theft system, have tried to reset it but nothing works. All the diagnostics say all systems are functioning as normal.

    Any advice is appreciated

  7. I have a 2006 H3. All stock but thinking about making some changes. Currently have 265/75R16 tires. Do you know if a 285 will fit without any kind of lift? Looking for the best tire/wheel combo I can get to accommodate more off road travel. If I do have to lift, what is the best possible way to achieve the amount of lift required to fit a 285 tire? Thanks!

    1. I have 285/75R16 Cooper Tires on my 2007 H3, look great, no problems besides growl on the highway, sorry for delay and hope that helps.

  8. Hey,
    Love my H3, biggest concern I have is that since Hummer is defunct the parts will dry up or become hard to get. I recently had someone point out to me that while HUMMER is gone, GM is not and since they are the true manufacturer we will be good to go for decades to come. Do you agree? Is this a sinking ship?

  9. Just bought my first Hummer; (2007 H3), already cleaned the throttle body and am going to replace the CV drive shaft axles and your site is the ‘Cat’s Meow’! Kids are grown/off to college and wife and I can now spend more time on the water and trails, I prefer to do maintenance on equipment myself and your website will be my GOTO source. Thank You for your hard work in this site development and very much appreciate the details!

  10. Just replaced the rack and pinion and power steering hoses on my H3 and now it is throwing a “service stab sys” message? Any idea why?

  11. Schwarttzy brother any word on how we can use the onstar system for bluetooth on the 06 H3s without using costar bluestar product?

  12. Do you have wiring diagram for factory 2008 H3 Back-up Camera kit? I have the factory rearview mirrow with the Onstar and the camera that pops out when shifted into reverse. Need the wiring diagara so my guy can connect a camera.

    1. I wouldn’t know buddy, I just host the files. I would look into the navigation and radio PDF file for that information. I think what you’re looking for might be in there.

  13. Hey there! Great website, lots of info though I am curious to the one thing I couldn’t seem to find. Been having an issue with my front seat’s trim panel over the power controls. I think I need to replace the clip that holds it to the seat as well as the foam as its pretty mashed down (The foam that is) Do you have any info on replacement or clips for the front drivers seat trim panel with the power lumbar? I kept finding references to it in the pdf manuals but couldn’t find the info itself with picture or diagrams. Any help would be great! I love my 07 Black beauty!

  14. Leave a Reply

Store Front

$465 - Hidden Winch Mount
$255 - Skid Plates
$900 - Rock Sliders
$250 - Leaf Spring Bolt Plate
$99 - Extended Leaf Spring Shackles
$20 - HVAC Light Bulbs
$10 - WordPress Theme Adventure
$10 - WordPress Theme Semper Fi
Coming Soon, More Products on the Way!

Guide to the H3 Hummer

WordPress Web Design