Try using white vinegar. I first take off both lines and blow them out with shop air. Then I use two pieces of heater hose and hold both up and fill one end until vinegar starts coming out of the other hose. I let it sit for an hour or so and then flush both ways with water pressure. Sometimes it works and sometimes it doesn't. It is a big job to change the heater core. The blend door and the recirc door also go bad sometimes. This can cause a no heat situation also.
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Today's Featured Article - Pop's Tractor of Gold - by Gary Teate. My father was a simple man but could repair just about anythin mechanical that was ever made. From the time I was a young boy growing up in Jacksonville, Florida, I would spend a considerable amount of time helping my father repair or rebuild equipment and engines, etc. on our 2 1/2 acre "spread". Pop always dreamed of having more acreage out in the country where he could retire and tinker as much as he wanted and often reminisced about his boyhood days on his grandfathers farm in Montecello,
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