An engine can lock up on a number of reasons but mainly due to mechanical failure for example if the Timing belt snaps... etc...
It could, any engine can "lock up" if not maintained properly.
When the engine can no longer rotate.
The most common cause of engine lockup is a lack of oil. Also, an engine overheating from lack of coolant can cause an engine to lock up.
No, only the compressor will lock up.
Yes
Depends on what caused the engine to lock up. Most of the time a locked up engine is very serious and will require disassembly.
Yes, overheating can cause an engine to lock up. When an engine overheats, the heat can cause metal components to expand beyond their normal tolerances, potentially leading to seizure. Additionally, overheating can damage critical parts like gaskets and bearings, further contributing to engine failure. If not addressed promptly, these issues can result in a complete engine lock-up.
was there oil in it?
Lock up, No but a bad crank sensor will prevent the engine from starting.
Major engine failure?
the oil lubricates the engine parts, without it the engine would lock up and be ruined
Your engine could be locked up from low oil, burnt up rings or just a blown up engine