I went though the same thing with a 95 C1500 4.3. Before I got it someone put the wrong antifreeze in and plugged the heater core so I changed the heater core. Still no heat. Someone told me the restrictor in the intake gasket so I had that changed. I also changed the dash control and thermostat. I also changed the water pump thinking that it may not be pumping enough to keep it from overheating but not enough to heat. Still no heat. Finally I decided that a heater hose had collapsed on the inside. I took the front one off and it was stopped up with crud at the fitting. I don't know why I didn't see that when I changed the pump but anyway that was the problem.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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