Yes, I got that since it is a PT Cruiser. My answer is based upon the fact that it is a PT Cruiser
A coolant leak will not cause the engine to lose power and shut down and restart unless it was left unattended and lost all the coolant and seized the engine.
The most likely cause of the current issues is the water pump failing and causing the timing belt to fail, or the timing belt breaking which will cause it to overheat as the water pump no longer turns. The combination of loss of timing belt and water pump no matter which caused the other to fail will cause a loss of power, overheating as well as a no start condition
The first step is to remove the timing belt cover to verify the timing belt is either broken or loose and then go from there in repairing.
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