Removing the heater core is not really difficult. Disconnect the heater hoses under the hood. Remove the passenger side lower dash panel. (Three screws, two bolts.)
Remove the front of the heater box. (Seven? hex head screws.) If the heater core has been removed previously and the person left out the two screws close to the firewall (a really good idea!), remove two screws holding the heater core in place and pull the core. If you are first one doing the job, remove two sheet metal nuts above and below the hose connections under the hood -and push open the recirculate air door and remove four nuts around the blower wheel opening. Disconnect the hose to the recirculate air door motor and pull out the heater box. Easy enough!!
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