When your vehicle begin to overheat even while idling this is an obvious indication that one of the components responsible for keeping the engine cool is not functioning properly for an engine to overheat in the first place. Today we will be looking at some of the reasons why your vehicle could overheat while idling.
Fan Clutch: Remember the car relies on the fan to draw in air while it is idle. On a manual vehicle, the fan clutch controls the fan speed. Now when the clutch is faulty, maybe because it is worn out, does not rotate at proper speed or is unable to draw sufficient amount of air through the radiator, then the car is bound to overheat.
Temperature Sensor: On vehicles with an electrically powered fan, the fan is activated by a temperature sensor. When the vehicle is stopped air is no longer forced through the radiator by the motion of the vehicle, causing coolant temperature to rise. When the temperature exceeds a certain level, the sensor activates the electric fan which draws air through the radiator to cool the engine until the temperature is sufficiently lowered. A faulty sensor will not turn on the fan when the vehicle is stopped, causing the engine to overheat.
Fan Shroud: The fan shroud directs the air pulled through the radiator by the fan. If the shroud is missing or is damaged, air can escape around the shroud, reducing the amount of air pulled through the radiator by the fan. The result is that less heat will be leaving through the radiator. The engine overheats while the car idles.
Obstruction: This one is largely due to accumulated Dirt’s, bugs, and road grime collected over time thereby clogging the closely spaced fins of a radiator, obstructing easy airflow. As a result, little or less heat is let out; thus, overheating when the car idles.
Internal Clogging: this takes place in the cooling tube. As a result, the radiator is impeded and slowed down, causing overheating.
All these are issues that shouldn’t be taken lightly. When you notice your vehicle is too hot after a drive, don’t wave it off with the usual “it might be the distance” excuse. Cars are meant to go long distance without overheating. Find out instead, if any of these is the cause of the overheat. You will not notice while you drive because the car gathers enough air to cool itself while in motion.