Hi all. As far as I can ascertain it doesn't matter which way around the lines are run in and out of the heater core. I understand I need to get the lines right form the motor to the shut off valve etc but want to double check on the internal side. Also is there a preference. I saw someone suggesting running inward line to the top and out through bottom as a preference? FWIW here is a pic of the heater core outlets. It's an Old Air system. Cheers Ron.
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Edited by Cook, 24 April 2020 - 02:02 PM.