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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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