If I remember correctly, your first post on this mentioned that it worked just fine with plenty of heat AS LONG AS IT WAS REVVED UP OR GOING DOWN THE ROAD. Since you've changed the pump/impeller and flushed everything then I'm going to go out on a limb here and say you have an air lock and it is caused by a partially blown head gasket pressuring up the system. I've had three do this exact same thing. '81 5.7 diesel Caddy , 2.2 Dodge Shadow and 3.4 GM V6. When you put air under pressure into that system it will airlock and stop circulation until rpm of impeller overrides it. Not just an opinion, it has happened to me and your 4.3 isn't immuned to it . Simple test is bubbles in rad. or put an exhaust sniffer in rad.
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Today's Featured Article - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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