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 - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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