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is the truck actually overheating, or is the gauge just saying it is? it could be a bad gauge, or the gauge temp sensor is bad (there is a seperate sensor for the ECU and the gauge) how soon after you replaced the timing chain and water pump the FIRST time did it start to overheat? is it possible that you just left a wire un plugged? or it may just be a coincidence that the thermostat broke at the same time.
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