heater core on 1998 Cadillac Seville STS

i have a leak on the inside of my car on the passenger side. i have been tolde it is the heater core. Do you have a step by step procedure of how to replace a heater core. Dealer ship to high, they book shows it to be a 10 hour job. Also do you have any pictures of the step instructions.

Asked by for the 1998 Cadillac Seville STS
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