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International Automotive Technicians Network
Re: Heater core flushing
Posted to HVAC Forum on 1/13/2025

We have used this method using CLR recently on 3 vehicles that were pretty clogged up. It was looking very likely that all 3 heater cores were going to be needing replacement. It has worked on all 3. We have used different versions of pressure guns in the past... Login to read more.