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Re: Heater core flushing
Posted to HVAC Forum on 1/12/2025

Hi Gene,

First, I would try blowing it out, both directions with 40 psi of shop air, then use lengths of heater hose to connect to the heater core pipe nipples. Use a 50/50 CLR and water mix to fill one hose and let it seep in until it balances on the other ... Login to read more.