hi, i have a 2004 rx8 MT
my car has 150k km and was running well

i just realized when im pulling on the highway or on the highway for prolonged periods of time, my engine coolant light comes on in the car and then will go away after a couple minutes

this problem only happens when the car is in 4th or 5th, never with city driving. my car feels normal otherwise and am just curious to what the problem is?

anyone have any suggestions?

 

Fill up your coolant

 

^That.
Or, try reading one of the MANY threads that discuss this issue...