Temperature heater flap door, causes truck to go from normal temperature to red hot with boiling coolant in reservoir. Have spent thousands and thousands of dollars , on mechanics and parts! Replaced water pump , thermostat, lots of cooling and heater parts and components . No luck and still no good running car , missing work and spending money we dont have I read online about other trucks my same year and model having a recall on a temperature door. Causing it to overheat and a lot of people have had the same issue as Im having. I looked up my truck. It dsnt have it listed on the recall list but Im sure that its the same issue