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Sounds like it's time to me, IMO
Sounds like anti-freeze again. Was the head checked for cracks or warpage before it was reinstalled.
Possible gauge stepper motor, hopefully the charging system has been checked for proper output.
No dealer needed, a good belt like Gates will work just fine. Rubber belts dry out in time and go bad, common symptom.
It's electronic controlled on a Cadillac. Have it scanned with a professional scanner, possible steering sensor issue.
ABS issue, have the ABS module scanned for the fault.
2 for a V-6 or V-8, Muffler shop here charges around $250.00 each installed.
Check coolant level, sounds like coolant could be low, or not full. Possible thermostat issue as well.
MB power steering fluid.