If you own a motorhome or large RV equipped with HWH active air suspension, you know how much it improves ride comfort and handling. But when parts wear out or need upgrading, finding the right components can be confusing. This guide covers the key parts of HWH active air suspension systems, what to look for when replacing them, and how to get the best performance from your setup.
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Understanding HWH Active Air Suspension Systems
HWH active air suspension uses air springs and electronic controls to automatically level and adjust your RV's ride height. The system includes several critical components that work together. Knowing the function of each part helps you identify what needs replacement and avoid buying incompatible items.
Air Springs (Air Bags)
The air springs are the rubber bellows that replace conventional steel springs. They inflate or deflate to control ride height. Over time, rubber can crack or leak, especially in harsh weather or after years of use. When replacing air springs, check the part number on the old unit—HWH uses specific designs for different chassis and weight ratings. Pay attention to the air fitting orientation and the mounting brackets.
Height Control Valves
These mechanical or electronic valves sense the vehicle's ride height and adjust air pressure accordingly. On older HWH systems, height control valves are often pneumatic; newer ones are electronic with sensors. If your RV leans to one side or fails to level, a faulty height control valve is a common culprit. Replacement valves should match your system's type (mechanical vs. electronic) and the number of axles.
Compressor and Air Dryer
The compressor supplies compressed air to the suspension system. HWH uses specific 12V or 24V compressors. A failing compressor may run continuously or not reach pressure. The air dryer removes moisture from the compressed air; a clogged dryer can cause valve or bag failure. Some compressors have an integrated dryer, while others are separate. Always check compatibility with your HWH system model (e.g., 2000 series, 4000 series).
Control Module and Wiring
Electronic HWH systems have a control module that processes inputs from sensors and switches. Water damage or voltage spikes can fry the module. Replacement modules must be programmed or matched to your system. If you're not experienced with electrical diagnostics, consider getting a refurbished module from a specialist that is pre-programmed for your chassis.
Commonly Replaced HWH Active Air Suspension Parts
Based on typical failure points and wear patterns, these are the parts RV owners most often need to replace.
Leaking Air Springs
Air springs often develop pinhole leaks from ozone cracking or road debris. Symptoms include sagging on one corner, constant compressor cycling, or a hissing sound. When replacing, always replace both springs on the same axle to maintain even handling. Upgrading to double-convolution or reinforced bags can improve durability.
Faulty Solenoid Valves
Solenoid valves control air flow to the bags. They can stick open or closed due to dirt or coil failure. A stuck valve can cause a bag to inflate or deflate unexpectedly. Replacement valves are available as individual units or in valve blocks. Ensure the voltage (12V or 24V) and connector type match your system.
Worn Height Sensors
Electronic height sensors are potentiometers that send position signals to the control module. They can fail due to corrosion or wear. Before replacing a sensor, check its wiring and connector. After replacement, the system may need recalibration—some modules require a specific sequence or scan tool.
How to Choose Replacement Parts for HWH Active Suspension
Choosing the right parts involves matching specifications and understanding your system version.
Identify Your HWH System Model
Look for a label on the control module or near the compressor. Common models include Series 200, 400, 600, and 2000. Each series uses different parts and connectors. If the label is missing, note the number of air bags and valves, and whether the system has manual or automatic leveling.
OEM vs. Aftermarket Parts
HWH original equipment (OEM) parts are made by HWH and guarantee fit and function. They are typically more expensive but come with a warranty. Aftermarket parts from suppliers like Air Lift or Firestone may work, but compatibility is not guaranteed. For critical components like the control module or height sensors, OEM is safer. For air bags and simple valves, aftermarket can save money if you verify dimensions and fittings.
Where to Buy
Specialty RV parts suppliers and suspension shops carry HWH parts. Some offer rebuilt compressors and modules at lower cost. Avoid generic air suspension parts sold for semi-trucks unless you are certain they match your HWH system. Online forums for motorhome owners can help you find reputable dealers.
Installation Tips and Common Mistakes
Replacing HWH air suspension parts requires mechanical skill and caution with air systems.
Safety First
Always deflate the air system completely before removing lines or bags. Use jack stands to support the vehicle; never rely on air springs alone. Compressed air can cause serious injury if released suddenly.
Common Pitfalls
- Mixing up air lines: Label each line when disconnecting. A crossed line can cause the system to operate backward.
- Overtightening fittings: Use a torque wrench if possible. Overtightening cracks plastic or aluminum fittings.
- Ignoring calibration: After replacing a height sensor or control module, follow the manual's calibration procedure to restore proper leveling.
Final Recommendation
For most RV owners, the practical approach is to replace worn parts with OEM components, especially if the rest of the system is in good shape. If you are on a tight budget, aftermarket air bags from a reputable brand that matches HWH dimensions can be a cost-effective alternative. Always buy from a dealer that can confirm compatibility with your specific HWH series and chassis. Keep a record of your system's serial numbers and part numbers for future reference. If you are not comfortable with DIY repair, a certified mobile RV technician who has worked on HWH systems is worth the investment. Proper maintenance and timely replacement of worn parts will keep your HWH active air suspension delivering a smooth, level ride for years to come.