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?|||ANY OF THOSE TEMPS ARE HOT ENOUGH TO MAKE THE HEAT BLOW HOT. THERE ARE TWO PARTS IN YOUR DASH TO CONTROL THE TEMP COMING OUT THE VENTS. ONE IS THE EVAPORATOR (MAKES IT COLD USING A.C.) AND THE OTHER IS THE HEATER CORE (MAKES IT HOT). THERE IS A DOOR BETWEEN THE TWO THAT IS CONTROLLED BY AN ELECTRONIC ACTUATOR. WHEN YOU PUT THE CONTROL ON HOT THE DOOR CLOSES OFF THE EVAPORATOR, AND WHEN YOU PUT IT ON COLD, IT SHUTS OFF THE AIR FROM THE HEATER CORE. YOUR PROBLEM COULD BE THE HEATER CONTROL ASSEMBLY NOT SENDING THE SIGNAL TO THAT ACTUATOR, OR THE ACTUATOR IS DEFECTIVE. USE A TEST LIGHT AT THE CONNECTOR TO THE ACTUATOR. IF IT LIGHTS UP WHEN YOU SLIDE THE CONTROL FROM HOT TO COLD, THE CONTROL IS SENDING THE SIGNAL AND THE ACTUATOR IS BAD. IF THE LIGHT DOES NOT LIGHT UP, REPLACE THE CONTROL ASSEMBLY.|||completely depends upon the temperature of thermostat that is installed... 190 192 195 are all thermostat temps I have come across... so 210 might be very slightly high... also are you going by the factory temp gauge or professional shop one... factory gauges can be off this small amount...