Hummer Parts

Hummer Parts for Sale

This page lists the Hummer parts we sell. Right now the range is focused on one of the most common repairs on the Hummer H2: the rear air suspension. We sell a rear air to coil spring conversion kit for the 2003-2009 H2, which you can order online from this page. The product page lists the fitment, the OE reference and what is included.

We are adding Hummer parts as we source them. If you need something that is not listed, send us the part number or your VIN through our contact page and we will tell you whether we can supply it.

Below you will find the details of the conversion kit, an explanation of the H2 rear air suspension and why it fails, the pros and cons of converting to coils, how to fit the kit, and answers to common questions.

Hummer Parts in Stock

This kit also appears in our shocks and struts collection, alongside air suspension struts for the Cadillac Escalade, Chevrolet Tahoe and Suburban and GMC Yukon. For other suspension work, see suspension parts and control arms.

About the Hummer H2 Rear Air Suspension

The H2 was sold from 2003 to 2009 as the SUV, and from 2005 as the SUT pickup version. Many H2s were built with a rear air suspension that keeps the back of the vehicle level when it is loaded or towing. It uses two rubber air springs at the rear axle, an electric compressor, an air dryer, a height sensor and a control module. When you load the rear or hitch a trailer, the sensor sees the rear drop and the compressor pumps up the air springs to bring it back to height.

That works well when everything is new. The trouble comes with age. Rubber air springs dry out and crack, especially in hot sun, cold winters or salty conditions. Once they leak, the compressor has to run more often to keep the height. Compressors were not designed to run constantly, and they overheat and fail. Height sensors and air lines can also fail. The result is the familiar picture: an H2 sitting low at the rear in the morning, a compressor that runs and runs, and a warning message on the dash.

For a general history of the brand and models, the Hummer article on Wikipedia is a good starting point.

Signs Your H2 Rear Air Suspension Is Failing

  • The rear sags after the vehicle has been parked for a few hours or overnight.
  • The compressor runs for a long time, or runs every time you start the engine.
  • A hissing sound near the rear wheels, which means a leaking air spring or air line.
  • A "service air suspension" or similar message on the dash.
  • The rear does not lift when you load it or hitch a trailer.
  • Visible cracks in the rubber of the air springs.
  • A harsh, bouncy ride if an air spring has deflated completely.

A simple test: spray soapy water on the air springs and lines with the system pumped up. Bubbles show you exactly where the leak is.

Repair or Convert to Coil Springs?

You have two routes when the air suspension fails.

Repair the air system with new air springs, and possibly a new compressor, dryer and sensor. You keep automatic levelling and the original ride. The downside is cost, and the fact that you may face the same repair again in some years.

Convert to steel coil springs with a kit like ours. The rear sits at a fixed height, and there is nothing left to leak or burn out. Many owners who keep their H2 for the long term choose this route, because the repair is done once.

Things to weigh before converting:

  • Towing and heavy loads: without air levelling, the rear will sit lower when heavily loaded. If you tow large trailers often, consider a weight-distributing hitch.
  • Ride feel: most owners find the ride similar for normal use. It may feel a little firmer or softer depending on load.
  • Warning lights: once the air system is removed, the control module may report a fault. Many conversions include a way to deal with the warning, or the system can be switched off in the module. Check the instructions with your kit.
  • Local rules: in some countries, suspension changes may need to be declared at inspection. Check the rules where you live.

Fitting the Air to Coil Conversion Kit

This is a moderate job that many owners do at home with good tools and safety stands. A workshop can do it in a few hours. The general steps are below. Follow the instructions supplied with the kit.

  1. Park on level ground and switch off the air suspension if your H2 has a service mode or a fuse for the compressor. This stops the system trying to pump while you work.
  2. Raise the rear and support the frame securely on axle stands. Support the rear axle with a jack.
  3. Deflate the air springs fully and disconnect the air lines.
  4. Disconnect the height sensor link if the instructions say to.
  5. Remove the air springs from their upper and lower mounts.
  6. Fit the coil springs and any spacers or seats supplied in the kit. Make sure each spring sits correctly in its seats.
  7. Lower the axle carefully onto the springs, then lower the vehicle to the ground.
  8. Deal with the compressor and warning light as described in the kit instructions.
  9. Check the ride height and get the rear checked for any alignment or brake proportioning issues if your vehicle needs it.

While the rear is up, it is a good time to look at the rear shocks, brake lines, and axle seals. Worn shocks will make the new springs feel bouncy.

Keeping an H2 on the Road

The H2 is built on a General Motors full-size truck platform, so some service parts are shared with GM trucks and SUVs of the same era. Always check the fitment on each part, because many Hummer-specific parts differ. Useful routine work on an H2 includes:

  • Regular brake checks. The H2 is heavy, and brakes wear faster than on a lighter SUV.
  • Checking the steering parts, tie rods and ball joints, which take a beating from large tyres.
  • Keeping the cooling system healthy, especially if you tow.
  • Replacing engine air filters more often if you drive on dusty trails.
  • Looking at off-road accessories if you use it the way it was designed to be used.

You may also find related parts on GMC parts, Chevrolet parts and Cadillac parts, but check each listing for Hummer fitment.

Ordering, Delivery and Returns

You can order these Hummer parts directly from this page. Delivery options and times for your country appear at checkout and on our shipping page. If a part does not match its listing, our returns page explains what to do, and our warranty page covers faulty parts.

Hummer Parts FAQ

Does the conversion kit fit the H2 SUT?

Check the fitment list on the product page. The kit is listed for the 2003-2009 H2 with rear air suspension.

Will my H2 sit lower after the conversion?

Unloaded, it should sit at about the normal height. Under heavy loads it will sit lower than with working air levelling, because coils do not adjust automatically.

Do I need to remove the compressor?

Not always. Many owners leave it in place but disconnected. Follow the kit instructions for the compressor and the warning light.

How do I know if my H2 has rear air suspension?

Look at the rear axle. Air springs are rubber bags, often round, sitting between the axle and the frame. You will also see small air lines running to them, and an air compressor under the vehicle.

Can I go back to air suspension later?

Yes, if you keep the mounting points and the air system parts. Most owners who convert do not go back.

Do you have more Hummer parts?

We are adding more. Contact us with your part number and we will check what we can supply.

Do you deliver Hummer parts to my country?

Delivery options for your address are shown at checkout. See our shipping page.

The Hummer H2 in Brief

The Hummer H2 was built by General Motors from the 2003 to the 2009 model year. It shared much of its running gear with GM's full-size trucks and SUVs of the time, including the Chevrolet Tahoe, Suburban and Silverado, and the GMC Yukon and Sierra. Early models used the 6.0L V8 and later models moved to the 6.2L V8. The H2 SUT, a version with a short pickup bed, joined the range from the 2005 model year. Because the H2 shares so many parts with other GM trucks, owners can often find drivetrain, electrical and engine parts more easily than for a low-volume vehicle. Body and suspension parts unique to the H2, like its rear air suspension, are the exception.

Why the Rear Air System Ages

Air suspension uses rubber air springs that flex every time the vehicle moves. Over years of heat, cold, road salt and ultraviolet light, the rubber cracks and begins to leak. The compressor works harder to keep up, and eventually the compressor itself wears out. Air lines and fittings can also leak, and the height sensors that tell the system how high the vehicle sits can fail. Because many H2s are now well over a decade old, it is common for owners to face several of these failures at once. That is why many choose a coil spring conversion, like our Hummer H2 air to coil conversion kit, rather than replacing each air component in turn.

What You Need Alongside the Conversion Kit

A conversion kit replaces the rear air springs with steel coils. Depending on your vehicle's condition, you may also want to replace the rear shocks at the same time, because they are often as old as the air springs and are easy to change while the rear is apart. Check the rear suspension bushings and the track bar while you have access. After the conversion, the vehicle may show a suspension warning light because the computer expects the air system to be there. Some owners use a bypass module or have the warning disabled with a scan tool; follow the instructions that come with your kit, and ask a specialist if you are unsure. Browse our shocks, struts and coilovers and control arms, ball joints and sway bars for related parts.

Towing and Load After a Coil Conversion

The air suspension on the H2 helps keep the rear level when you load the cargo area or hitch a trailer. With coil springs, the rear will sit lower when loaded, the same as a conventional truck. If you tow regularly, consider helper air bags or a weight-distributing hitch to keep the vehicle level. Our towing and trailer collection has hitches, ball mounts and lighting, and you will find helper air bags in shocks and struts.

Common Checks on an Older H2

  • Inspect the front control arms and ball joints, which carry the H2's heavy weight.
  • Check the brakes, since the H2 is heavy and works its pads and rotors hard.
  • Look at the exhaust manifold bolts, which can break on GM V8s of this era and cause a ticking noise.
  • Test the 4WD system, including the transfer case modes and the front axle engagement.
  • Check the door handles and lock actuators, which can wear on high-mileage vehicles.

Many of these parts are shared with other GM trucks; search our Chevrolet parts, GMC parts and Cadillac parts collections and check the fitment for your model year.

Off-Road Use

The H2 was designed to be capable off-road, with high ground clearance and a full-time four-wheel drive system. If you take your H2 off the road, check the underside after each trip for damage to the fuel tank skid plate, steering parts and brake lines. Rinse off mud and salt, because trapped dirt holds moisture and speeds up corrosion. A coil conversion actually suits off-road use for many owners, because there are no air springs or lines to puncture on the trail. Pair it with the recovery gear in our off-road and 4x4 collection and a winch from winches.

More Hummer Parts Coming

We add new Hummer parts as we source them. If you are looking for a specific part for your H2 or H3, send us the part number or your VIN through our request a part page and we will check what we can supply.

Diagnosing the H2 Rear Suspension Before You Buy

Before you decide between repairing the air system and converting to coils, it helps to know exactly what has failed. Start with the simple checks. With the engine running, listen for the compressor under the vehicle. If it runs for a long time or never stops, there is a leak somewhere. If it does not run at all, check the fuse and relay first. Next, spray soapy water over the rear air springs, the air lines and the fittings while the system is pressurised; bubbles show the leak. Look at the rubber bellows for cracks, especially at the folds. Finally, if the vehicle sits level but shows a warning, the height sensor or its linkage may be the cause. A scan tool that reads suspension codes saves a lot of guesswork.

The Cost Picture

Repairing an H2 air system can involve several parts: two air springs, the compressor, the dryer, air lines and possibly a height sensor. On an older vehicle, fixing one part often reveals the next weak point. A conversion kit replaces the air springs with coils and leaves nothing to leak. For owners who want the self-levelling feature for towing, repairing the air system may still be the right choice; for others, a conversion is a one-time fix. Compare the total cost of the parts you need, and think about how long you plan to keep the vehicle.

Ride Quality After Conversion

Steel coils are tuned to carry the vehicle's normal load. Many owners find the ride similar to the original on the road, with a slightly firmer feel over sharp bumps. The rear may sit at a fixed height that is a little different from the factory air height; check the ride height after the springs settle for a few days, and have the headlights re-aimed if the rear sits higher or lower than before.

More Questions About Hummer Parts

Does the conversion kit fit the H2 SUT?

Check the fitment on the product page. The kit is listed for the 2003-2009 H2; confirm whether your body style is included before ordering.

Will I lose the rear self-levelling?

Yes. With coil springs, the rear no longer adjusts its height automatically. Helper air bags or a weight-distributing hitch help when towing.

Do I need a wheel alignment after the conversion?

The rear axle on the H2 is a solid axle, so alignment changes are small, but it is good practice to check the alignment after any suspension work.

Can I fit the kit at home?

Yes, with the vehicle safely supported on axle stands and the rear axle supported with a jack. Follow the kit instructions and release any air pressure before disconnecting lines.

Will the compressor still run?

It depends on how the system is disconnected. Follow the kit instructions to disable or remove the compressor so it does not run continuously.

Buying a Used Hummer H2

If you are thinking about buying an H2, check the rear suspension carefully. Look at how the rear sits after the vehicle has been parked overnight, listen for the compressor running for long periods, and ask whether the air system or a conversion has been done. Check the service history for oil changes and transmission services, inspect the frame and underside for rust and off-road damage, and test the 4WD system in all its modes. Look for warning lights on the dash, including the suspension and ABS lights. A conversion kit is a sensible budget item if the rear air system is tired.

Shared GM Parts for the H2

The H2 shares engines, transmissions and many electrical parts with GM's full-size trucks of the same era. Starters, alternators, sensors, ignition coils, water pumps and many filters are shared with the Tahoe, Yukon and Silverado. That makes routine maintenance parts easy to find. Body panels, interior trim and the rear suspension are H2-specific. Search our Chevrolet and GMC collections for shared parts and check the listed fitment for the H2.

Fuel Economy Expectations

The H2 is heavy and has a large frontal area, so fuel economy is low by modern standards. Keeping the tyres at the correct pressure, the air filter clean and the engine in good tune helps, but no upgrade will make it frugal.

Storing an H2 Long Term

If your H2 spends long periods parked, a few steps keep it healthy. Fill the fuel tank and add a fuel stabiliser, keep the battery charged with a maintainer, and inflate the tyres to the recommended pressure. Start and drive the vehicle every few weeks if possible, so seals stay lubricated and the brakes do not rust. On vehicles that still have rear air suspension, long storage can let the rear settle; a coil conversion removes that worry. Before driving after storage, check the fluids, tyres and brakes.

Not sure whether your H2 needs a conversion kit, new shocks or both? Send us your VIN and a short description of the symptoms through our request a part page, and we will help you choose the right parts.

Every Hummer part on this page lists its fitment and the model years it suits.