so the deal is my thermostat stuck causing the truck to overheat so i replaced it. after replacing the thermostat the truck would overheat when at idol or speeds under 40mph and the heater would go cold. i took the truck to the dodge dealer and they pressure tested for leaks and found none and burped the system. a couple of weeks later the truck started the same issues again (overheating at low rpms) the other day i got in my truck for a short trip and the truck ran just fine, i even let it idol for a while and no overheat and not cold air. so what is causing it to intermittently overheat?
why does my truck overheat? on 2002 Dodge Dakota
by jburkitt in Columbus, OH on January 24, 2013
ANSWER by gmc4me on January 24, 2013
Could be low coolant, bad radiator cap, bad thermostat, or cooling fan malfunctioning. Some thermostats have a fail open feature so when the vehicle overheats the thermostat stays open to protect the engine. Since you say it's intermittant this may not be the case.