* Steering wheel lock: This is a mechanical device that prevents the steering wheel from turning when the vehicle is parked. To unlock it, simply turn the ignition key to the "on" position (not necessarily starting the engine). The steering wheel should then unlock.
* Seized steering: If the steering wheel is unusually stiff or difficult to turn, even with the ignition on, this suggests a problem with the steering system. Possible causes include:
* Low power steering fluid: Check the power steering fluid level and add fluid if needed (use the correct type specified in your owner's manual).
* Power steering pump failure: A failing power steering pump will make steering very difficult.
* Frozen or seized steering components: This is more likely in extremely cold weather.
* Binding in the steering linkage: Something might be binding or interfering with the normal movement of the steering linkage.
* Wheel stuck due to a mechanical problem: If you mean a wheel is *stuck* and won't turn freely even when the vehicle is jacked up, it's likely due to a mechanical issue, possibly:
* Brake caliper seized: A seized brake caliper will prevent the wheel from rotating freely. This requires professional attention.
* Wheel bearing failure: A damaged or failed wheel bearing will make the wheel difficult to turn and could lead to dangerous situations.
* Something obstructing the wheel: Check if something is jammed against the tire or wheel.
To summarize: If you can't turn the steering wheel, it's likely the steering wheel lock or a steering system problem. If a wheel is *physically* stuck from rotating, it's a more serious mechanical issue that requires immediate attention from a mechanic.
If you can provide more detail about what's actually happening (e.g., "The steering wheel is completely stiff," or "The front left wheel won't turn when I try to jack up the van"), I can offer more specific advice.
