What is the normal running temperature for a 99 chevy blazer before it is considered overheating?

i just had a heater core put in but it is still blowing cold air. one person says it is running hot and another one says it is normal. is 190 or 210 the correct normal running temperature for a 99 chevy blazer? what else could be causing the air to still be blowing cold instead of hot?
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