Engine continuing to run-Thermostat? 1 or 2 Problems

Heligal815

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I have a 2008 GMC Acadia, it has had multiple and continual problems however I keep trying to save it.
The latest anomaly being when I shut the vehicle off the engine continues to run for abt 20 seconds before shutting, occasional even after the key is out of the ignition.
This started happening almost at the same time as another problem started, a warning saying Engine Hot A/C Shut Engine? I put more coolant in, it continues to say it, I have no idea if its the thermostat (which hasn't moved) or the water pump, the radiator?
Sooooo I
I'm not sure if these 2 problems are related or separate.
Of anyone has any ideas or can help with any Input with either or both I would be extremely appreciative.
Thanks!
 
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