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

by in New Brunswick, NJ on February 24, 2013
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1 answer
ANSWER by , February 24, 2013
check to see if both heater hoses are hot and check blend door operation