Most Likely Causes:
* Wheel Balance: This is the most common cause. An unbalanced wheel will cause vibrations at specific speeds. The weight distribution around the wheel isn't even, leading to the shaking. This is a relatively inexpensive and easy fix.
* Tire Rotation and Condition: Uneven tire wear (cupping, feathering) can cause vibrations. Check the tire's tread depth and look for any unusual wear patterns. If the tires haven't been rotated recently, this could be contributing.
* Bent Wheel/Rim: A bent rim, even a slight bend, can cause vibrations. Inspect the rim carefully for any obvious bends or damage.
* Worn or Damaged Ball Joint: A worn ball joint can introduce vibrations and handling problems. This is a more serious issue requiring professional inspection and replacement.
* Worn Tie Rod End: Similar to a ball joint, a worn tie rod end can cause vibrations and steering issues. This also requires professional attention.
* Brake Rotor Warpage: While less likely to cause vibrations only in a specific speed range, a warped brake rotor on the left front could contribute. Inspect the rotor for unevenness.
Troubleshooting Steps:
1. Visual Inspection: Carefully inspect the left front tire, rim, and surrounding suspension components for any obvious damage, wear, or bends.
2. Tire Pressure: Check the tire pressure and inflate it to the manufacturer's recommended pressure (found on a sticker inside the driver's side doorjamb or in your owner's manual). Incorrect pressure can contribute to vibrations.
3. Rotate Your Tires: If you haven't rotated your tires recently, do so. If the vibration moves to a different wheel, it points to a tire-related issue (balance or wear).
4. Professional Inspection: If the visual inspection doesn't reveal anything obvious, take your Caravan to a trusted mechanic or tire shop. They can perform a wheel balance, check for wheel trueness (bent rim), and inspect the suspension components (ball joints, tie rod ends, etc.).
Important Note: Driving with a persistent vibration can lead to further damage to your vehicle. It's best to address this issue promptly. Don't attempt major repairs yourself unless you have the necessary experience and tools. A professional inspection is the safest and most efficient way to diagnose and fix the problem.
