Heater doesn't work so good - 74 Duster

Dicer said

Me, if you go this far to check the fan, I would change out your heater core, remember you are not convinced that the heater core is flowing well...….

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Agree. My concern is If I'm this far into it, I'd like to just install my A/C heater box in preparation for A/C next summer. But then I would need to make changes to the firewall to accommodate. I'll need to mull that over.