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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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