these last couple of days my car idles around 1500 to 2000 rpm on park and netrual. the raditor is about 2 years old, the fan is on (it doesnt turn off), the water pump is 2 years old, theres no water leak external nor internal. should i flush the coolent? another thing the car heats up alot but not to the point of over heat if am not running the car at high speed. its been a while since ive had a problem like this and on this site. its nice to come back here.