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How do I replace the heater core on a 1998 cadillac northstar SLS on 1998 Cadillac Seville SLS

I check the blower motor I cleaned out the vent with leaves under the hood the car is still blowing out cold air the

Asked by for the 1998 Cadillac Seville SLS
check to see if both heater hoses are hot and check blend door operation