Jeep Grand Cherokee Air Suspension Fix

Introduction

In this tutorial, we will guide you through the process of fixing the air suspension system in a 2016 Jeep Grand Cherokee. This issue may also apply to other Dodge, Jeep, and Chrysler models. The vehicle may raise but fail to lower, indicating a problem with the air suspension components. We will cover the necessary steps to diagnose and replace the faulty parts, ensuring your suspension system operates correctly.

Step 1: Diagnose the Air Suspension Problem

• Confirm the symptoms:
  • The vehicle raises but does not lower.
  • Warning messages may appear on the dashboard indicating service is needed for the air suspension.
• Check for leaks:
  • Inspect the airbags and lines for leaks, as these can cause pressure issues.
• Test the pump:
  • Listen for the air pump operation; if it runs continuously without raising the vehicle, further inspection is needed.

Step 2: Access the Pump and Valve System

• Locate the air suspension pump:
  • The pump is typically found under the front bumper or in the wheel well area.
• Remove the wheel well cover:
  • Use a wrench to remove bolts and plastic rivets securing the cover.
• Disconnect the relay:
  • Pull the relay from the fuse box to stop the pump from running while you work.

Step 3: Inspect and Replace the Valve Block

• Identify the valve block:
  • The valve block controls air distribution to the airbags. Look for color-coded lines connected to the block.
• Remove the valve block:
  • Unscrew the lines connected to the valve block.
  • Disconnect the electrical plug from the block.
• Install the new valve block:
  • Ensure O-rings are properly seated and connect the new block.
  • Tighten the lines securely.

Step 4: Replace the Air Pump if Necessary

• Assess the pump's condition:
  • If the pump runs but does not provide pressure, it may need replacement.
• Remove the old pump:
  • Unscrew and disconnect the pump from its bracket.
  • Take note of how the pump is connected for reinstallation.
• Install the new pump:
  • Position the new pump as per the original setup.
  • Secure it with bolts and reconnect the air lines.

Step 5: Fill the Air Suspension Tank

• Locate the air tank:
  • It is typically accessed through the back seat area.
• Use nitrogen for filling:
  • Connect a nitrogen tank to the filling valve. Nitrogen avoids moisture buildup that could damage the system.
• Monitor pressure:
  • Fill the tank to a recommended pressure of 175 to 225 PSI.

Step 6: Test the System

• Reconnect the relay:
  • Place the relay back into the fuse box.
• Start the vehicle:
  • Check for warning lights and monitor the suspension's response.
• Observe the operation:
  • Verify that the vehicle can now raise and lower as expected.

Conclusion

You have successfully diagnosed and repaired the air suspension system in your Jeep Grand Cherokee. Key takeaways include understanding the role of the valve block and pump, using nitrogen to maintain pressure, and conducting thorough testing post-repair. If issues persist, further inspection of the wiring and fuses may be necessary. For ongoing maintenance, regularly check the system to ensure optimal performance.