A couple things come to mind. 1 The water pump is bad (worn impellers) 2 May sound dumb but is the belt on right? 3 Has it had intake gaskets replaced? (Maybe put in wrong or wrong gaskets) 4 Did you burp the heater core? (air locked) 5 Have you checked for a blockage in the heater hoses at the engine and there fittings? I have run a wire down inside the fitting in the block and found a blockage.
I have worked on several 4.3 all with the same problems you list. And all of them were one of the problems listed above. It seams the 4.3 is a little fickle in the heating and cooling system for some reason. Bandit
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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