* Power Steering Pump/Fluid: Low power steering fluid is a common cause of squeaking, especially under load (like turning the wheel). The fluid may be old, contaminated, or the pump itself might be failing. Check your power steering fluid level and condition. If low, top it off with the correct type (check your owner's manual). If it's dark, dirty, or smells burnt, a fluid flush and replacement is likely needed.
* Rack and Pinion: The rack and pinion steering system itself could be the source. Wear in the rack, pinion, or their bushings can cause squeaking, particularly under load and at higher speeds. This usually involves a more complex repair.
* Steering Linkage Components: Tie rod ends, ball joints, or other steering linkage components can squeak when worn or dry. These components experience significant stress during turning, and the speed and direction specificity suggest a problem here. A mechanic would need to inspect these for play and wear.
* Suspension Components: While less likely to squeak *only* when turning left, worn-out ball joints, control arm bushings, or strut mounts could contribute to noise. Again, specific to left turns at speed suggests the issue might be more localized to one side.
* Brake Caliper/Pads: While less probable, a sticking brake caliper or worn brake pads on the left front could cause a squeak when turning the wheel, especially under higher speeds and load. Check your brake pads for wear.
Troubleshooting Steps:
1. Check Power Steering Fluid: This is the easiest and cheapest check.
2. Visual Inspection: Carefully inspect the front suspension components, including tie rod ends, ball joints, control arm bushings, and the steering rack for any obvious damage, leaks, or wear. Look for anything that looks dry or cracked.
3. Steering Wheel Play: Check for excessive play or looseness in the steering wheel.
4. Test Drive (carefully!): Try to reproduce the noise while paying close attention to when it occurs. Does it happen only at a specific steering angle or speed?
Important Note: If you're not comfortable inspecting these components yourself, take your RAV4 to a qualified mechanic. Ignoring steering and suspension issues can be dangerous. They are safety-critical systems. A proper diagnosis requires a thorough inspection by someone with the appropriate experience and tools.
