when car idle coolant goes to 200+ degrees

[N9QGS]

Hi guys,

This may be completely normal, I just never noticed it maybe until I had a ScanGauge hooked up. But when I am sitting at a traffic light or just in park sitting ideling, I notice the temperatures goes from 184 to 200 in about 2 minutes and after 200 it clicks the fan on and drops the temperature down to like 196, and then within a minute it does this again.

However this is the weird thing, they say if your car is running hot to turn the heat on. as an experiment, when the car gets up to 198, I turn the air conditioner on max cold. (this should not be as effective as the heat, maybe should have a negative effective but....), it instantly drops the coolant temperature back to 184.

I dont have an explanation for this, its like when you turn the air on, the coolant circulates better and cools, vs at idle and A/C off.. Is there something going on that I should be concerned with? I checked my coolant level its to the top.

Im thinking maybe there is air in the system. But if you guys think this, would I just again take the radiator cap off and run the car for 20 minutes with the heat on, is that right?

Ron