Engine is running slower at idle, therefore water pump is running slower and water is being circulated at a slower speed and there is no air flow through the grill to the radiator Try flushing the coolant and replacing the thermostat. This usually helps or solves the problem. If it doesnt then your radiator is prbably clogged and not properly dispersing fluid through it. You will most likely have to change the radiator. It is possibly the coolant temp sensor is not quite right. It could just be several things. Try the flusing first. Good luck.
In park or neutral, no.
Does your cooling fan work?
Its prob the radiator fan. Or you are out of coolant.
The radiator cooling fan is most likely not working.
You need to check the operation of the radiator fan.
Rough idling is whenever the vehicle's motor "misses" or does not fire causing an imbalance and a loss of rotation reducing the motor's power and causing excessive shaking.
Defective cooling fan or bad fan relay.
Check coolant level Cooling fan working? Dirt or clogged radiator? Defective radiator cap?
This fluctuation is caused by common use. The temperature will be higher when the vehicle is idling because there is no air moving over the engine like it does when the car is in motion.
try checking your cooloing fan. make sure it is running There is no air getting to your radiator as you are not moving! Or there is a problem elsewhere in your cooling system!
A bad fan clutch, low on coolant, missing fan shroud, bad thermostat or a plugged up radiator.
You need to check your cooling fans and be sure that they come on at 232-235 degrees. They should shut off at 195-200 degrees.