My car over heats when i take long rides. on 2005 Dodge Magnum

A red light comes on my dash and the temp gage dropps to cold. Whrn i stop or idle the car over heats. Ive tried to cut the car on and turn the a on and both fans are coming on.

Asked by for the 2005 Dodge Magnum
if your fans are working you could have a bad t stat
1 more answer , 1 more comment
maybe the fan is not turning on early enough
Also when i cut the car off and restart. The light gos off and the temp gage start back working. It only over heats on long tripps.