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Message: [QUOTE="Freightshaker, post: 600688, member: 7507"] I am in no way knocking his method. It worked for him. Heat exchanging is my trade and I have acidized a lot of heat exchangers. The only thing I will say about that is more of a personal disclaimer. Whatever chemical I would choose for cleaning a heat exchanger, I would make sure it is safe for all the metals and synthetic materials involved. Also follow manufacturers recommendations. Thankfully I have not had to pull or clean heater core or evap. So I am in the dark there. Like me and other posters stated check and compare temps. Does your a/c work great? It won't if it is down on airflow.(if you even use A/C) It may just boil down to everything is filthy: blower, heater core, and evap. You have a lot of stuff on here to get a great start down a cold frustrating road. [/QUOTE]

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