Overheating after idling at stop light for a long time will cool if I Rev engine

JOHNNYSILVERWOLF

MEMBER
2002 DODGE VAN
5.9L
V8
RWD
AUTOMATIC

While driving my van up to normal temp if I have to sit at red light temp will start to creep up if I Rev engine temp will go back down r as soon as light changes and I start going temp falls not losing any liquid do to leak but to overheating changed clutch fan but to no avail removed thermostat takes longer to heat up but that's all worse on hot days what can it be and what can be done about it?

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

If the fan clutch is new and working, the cooling system is clean and not corroded, it sounds like the old T-stat was bad. I know you removed it and it is worse. That is because the coolant is flowing too fast through the system without the resistance of a thermostat. The result is exactly what you described. It takes longer to warm up and then runs hotter when sitting.

If everything is clean, full, not corroded, the fan clutch is working, that is my first guess.