Seized Engine or other?

Brian-Emmons said:

would suspect it could be a failed head gasket, cracked block/cylinder liner or a cracked cylinder head that would allow coolant into one or more cylinders and eventually enough coolant entered into 1 or more cylinder's causing the engine to hydraulic lock and will be reason it will not turn over and worst case is if the valves have bent and are hitting the piston.
one way to test is to remove all the spark plugs and use either an inspection camera or to carefully use a dry stick/rod using gravity (last thing you want is to use pressure and snap it in the cylinder) down each spark plug hole to check for coolant in the cylinders.

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Brettjohn said:

Need some help on likelihood of having to replace my entire engine.

2017 Jeep Grand Cherokee 3.6L V6 Gas Auto 90k miles

My wife noticed the car would have a rough start-up with shaking and white smoke coming from exhaust. After a few seconds, it would run normal. Not sure when but eventually the check engine light came on as well. We took it to the shop, and the mechanic said it was bad sparkplugs and a bad coil (one of the six pistons were misfiring). Once replaced the engine ran better, no smoke, and check engine light went away. After a couple of days, the check engine light came on again. We took it into the dealer for an oil change, and they ran the check engine code and came back with something related to the EVAP I believe. We used the car for the next week. It had a couple of times where it took two starts for the engine to start. Then a week after the oil change, the engine would not turn over. My dumbass tried enough times to burnout the starter. (This was a little bit over a 2 week period)

The car is now at the mechanic where they thought at first the engine would not start because of the starter so they replaced it. Now they still cannot get the engine to start. They say they can turn the engine manually but only so far. They are saying the engine might be seized and I need a new one, but are looking at other potential causes (Crankshaft?).

For added context, we never had any indication of potential overheating in the engine. No low oil level indicators either. One thing I noticed during this time was a swooshing sound, which in my experience is coolant related. I checked and the coolant was low, so I topped it off. Before it completely stopped, I noticed the coolant was low again and was planning to buy some coolant that day. There was no evidence of a coolant leak below the car.

Based on that, what is the likelihood that the engine is completely locked out, seized, and no longer capable of working? Appreciate the feedback ahead of time! Thanks!

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