How do I replace the heater core in a 2002 Chevelle Silverado ?

unless minded mechanically inclined individual don't want begin task: doing requires complete removal of dash panel assemble can remove black long box runs along floor board center hump passenger side of truck inside cab. black box holds air conditioner evaporator coil , heater coil , small bolts , screws inside , outside along firewall hold black box in place , if break black box have buy new 1 , not cheap. air condition lines , heater hoses have disconnected , air condition lines not come apart easy because though aluminum tend seize being seated these years, if able complete these task dis assembling black box easy , replacing heater core equally easy miles of h_ ll go through their.

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