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 - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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