Gage is saying it is overheating, and it is puking out the over flow. Only overheats at idle. Or pulling a steep hill at a slow rateof speed. I can look in the new radiator and it has great flow.
Not enuff airflow thru the rad at an idle or slow speeds running up a steep hill.
Means not enough air flow thru rad.
Even the biggest fan won't help if it is too far away from the rad. All it will do is draw air from between the rad and the fan.
A shroud will work wonders, esp if the fan is part way into the shroud. That way, all the air that the fan moves has to come thru the rad.
