1. Brakes:
* Worn brake pads: This is the most common cause of grinding noises. Worn pads will grind against the rotor. You'll likely hear a squealing or grinding noise, especially when braking. Check: Visually inspect your brake pads. If they're thin (less than 1/4 inch of pad material remaining) they need replacing.
* Worn brake rotors: If the rotors are grooved or excessively worn, they can also cause a grinding noise. Check: Inspect the rotors for scoring, grooves, or excessive rust. You may need a mechanic to assess the extent of the damage.
* Loose brake caliper: A caliper that's not properly secured can cause a dragging and grinding sound. Check: Listen closely to pinpoint the noise. If it’s coming directly from the brake area, check the calipers for looseness or binding.
* Stuck caliper piston: A seized caliper piston won't retract properly, causing the pad to constantly rub the rotor. Check: This requires a bit more mechanical knowledge; you may need to take it to a mechanic.
2. Wheel Bearings:
* Worn wheel bearings: A grinding or humming noise that increases with speed often indicates worn wheel bearings. You might also feel a vibration in the steering wheel. Check: Jack up the car, support it securely, and try to wiggle each wheel. Excessive play indicates a worn bearing. A proper diagnostic requires a mechanic and special tools to ensure wheel bearings are indeed the source of the noise.
3. Suspension:
* Worn control arm bushings: These bushings connect the control arms to the chassis. If worn, they can cause a clunking or grinding noise, especially when turning. Check: Visually inspect the bushings for cracking or excessive wear. This usually requires inspection from a mechanic or inspection pit.
* Worn ball joints: Similar to control arm bushings, worn ball joints can cause a grinding or clicking noise, especially when turning or going over bumps. Check: Have a mechanic inspect the ball joints for play or excessive wear.
4. Other Possibilities:
* Damaged CV joint: This could cause a clicking or grinding noise, especially when turning.
* Power steering pump: A failing power steering pump can create a groaning or grinding noise.
What to do:
* Start with the brakes: This is the most likely culprit. Inspect the pads and rotors first.
* Listen carefully: Try to pinpoint the location of the noise. Does it change with speed, braking, or turning?
* If unsure: Take your Windstar to a mechanic for a proper diagnosis. Ignoring a grinding noise can lead to more expensive repairs later. A visual inspection may not be sufficient to diagnose the issue.
Safety First: Never work under a vehicle unless it's properly supported on jack stands. If you're not comfortable performing these checks yourself, take your Windstar to a qualified mechanic.
