Here are some possibilities:
* Steering linkage components: Worn tie rod ends, ball joints, or the steering gear itself can cause looseness and wandering. These components are prone to wear and tear over time, especially on a vehicle of that age. A leftward drift suggests a problem on the right side of the vehicle.
* Power steering system: Low power steering fluid, a failing power steering pump, or leaks in the system can lead to loose and unresponsive steering. Check your power steering fluid level; if it's low, topping it off might provide temporary relief, but it's not a solution to the underlying problem.
* Suspension components: Worn-out suspension components like bushings or control arm bushings can affect steering feel and alignment. While you're not experiencing vibrations, worn bushings can still contribute to looseness.
* Alignment Issues: The vehicle might be severely out of alignment. This is a common cause of drifting. An alignment check is essential.
* Tire pressure: While less likely to cause significant drift at highway speeds without other symptoms, uneven tire pressure can contribute. Check and ensure all four tires are inflated to the correct pressure specified in your owner's manual.
What you should NOT do:
* Don't continue driving the vehicle at highway speeds. This is unsafe.
* Don't attempt to diagnose or repair this yourself unless you have extensive automotive experience. Improper repairs can exacerbate the problem and lead to accidents.
What you SHOULD do:
1. Take your Explorer to a qualified mechanic immediately. Describe the symptoms clearly.
2. Have them perform a thorough inspection of the steering and suspension systems. This should include checking the power steering fluid, inspecting all linkage components, and checking the alignment.
3. Follow their recommendations for repairs. Don't skimp on necessary repairs; safety should be your priority.
Ignoring this problem could lead to a serious accident. Professional diagnosis is essential for safe and effective repair.
