Dodge Repair Questions? Ask a Mechanic for Answers ASAP
When you say the pickup will still heat does that mean it is overheating?
Based on the things you have done, if its physically overheating, and not just falsely warning you. Then that means the water pump and head gaskets are the only things left it can be. With the thermostat out, monitor the coolant flow through the cooling system with the radiator cap off. If its moving aggressive then the compression needs to be checked to see if a leak is packing air into the cooling system, preventing coolant flow.
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That would be a guess for me to answer that last response without knowing the test results on these things.