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Hi Justin, A problem with the cylinder head almost always results in overheating, not running below operation temperature. I think you hit the nail on the head with your diagnosis of a defective (or missing) thermostat. Regards John
Sounds like you may have a blown head gasket. Is your coolant level low and have you had to add coolant. Still sounds like you may have a cooling fan issue or maybe even a clogged radiator. what is the temperature difference from the inlet and the oulet of the radiatoe hoses? Anything less than 20 degrees and I would say the radiator is toast and you need a new one. And fix the cooling fan issue. But still dont rule out the blown head gasket especially if it over heated...
The cooling fan as in the one in front of the radiator? This fan also comes on when the AC is turned on, It sounds like your ac is turning on (the knob is probably on the defroster setting) and your blend door is probably stuck in the cool position.Try changing the air distribution from to a few different positions and see if it helps, this will help you figure out if you have a stuck blend door or another fault.
Check to see what else shares the same fuse with the radio. If cigarette lighter is on it could be a penny or something stuck between the lighter and socket. That would be because when it is hotter the ac is working harder to cool the car, forcing the ac condenser to heat more. Make sure all fans are kicking on to cool it down. Most cars have two fans one for when ac is off and one for when its on. So make sure both are kicking on or that one is kicking on and off with two different speeds. You can hear the fans kicking on and off when the car is on in park. If you don't hear fans kick on check fan fuses, relays, and fan motors.