1. Steering System:
* Steering Rack Boots: Check the rubber boots covering the steering rack tie rod ends for tears or damage. If damaged, grease could leak out, causing squeaking. This is a common source of noise.
* Tie Rod Ends: Inspect the tie rod ends for play or looseness. A worn tie rod end can squeak, especially when moving the steering wheel. A visual inspection might not be enough; you'll likely need to test for play.
* Steering Column: While less likely, a dry or worn bushing in the steering column itself could squeak.
2. Suspension:
* Ball Joints: Worn ball joints are a frequent cause of squeaking noises, particularly when turning. Inspect for excessive play or looseness.
* Control Arm Bushings: Worn bushings in the control arms can also create squeaking sounds. Look for cracks or excessive movement in the bushings.
* Sway Bar Bushings/Links: Worn sway bar bushings or links can squeak, especially during turning. Check for play or cracks.
3. Other Possibilities:
* Power Steering Pump/Fluid: Low power steering fluid can cause groaning or squeaking. Check the fluid level and condition. A failing power steering pump can also make noise.
* Belts: While less likely to squeak *only* when turning, a slipping or worn serpentine belt could contribute. Check belt tension and condition.
* Brake Components: Though less common, a brake caliper that's sticking slightly could create noise when turning, particularly if it's binding on one side more than the other.
Troubleshooting Steps:
1. Visual Inspection: Start with a thorough visual inspection of all the components listed above. Look for obvious signs of wear, damage, or looseness.
2. Test for Play: Gently try to move each component (tie rod ends, ball joints, etc.) to check for excessive play or looseness. This requires some mechanical knowledge. If you're unsure, it's best to have a mechanic do this.
3. Lubrication: If you find dry parts (like steering rack boots), carefully apply a lubricant specifically designed for rubber (like silicone-based spray lubricant). Do not over-lubricate. Excessive grease can attract dirt and cause further problems. This is a temporary fix; if the noise returns quickly, the part needs replacing.
4. Professional Inspection: If you cannot identify the source of the squeak after a visual inspection and basic testing, it's best to take your Explorer to a qualified mechanic. They have the tools and expertise to diagnose the issue accurately and perform the necessary repairs.
Remember safety first. If you are unsure about any aspect of the repair process, seek professional help. Driving with worn suspension or steering components can be dangerous.
