What are the reasons for engine overheating when the air conditioning is on?
1 Answers
Reasons are as follows: 1. Check if the electric fan is working properly: Normally, the electric fan has two gears, one is low speed and the other is high speed. The high-speed gear usually works when the air conditioning pressure is too high or when the engine's water temperature reaches 103 degrees Celsius. 2. Check if the thermostat's opening is insufficient: If the thermostat's opening is too small at normal temperature, it will cause the engine's cooling water to circulate slowly, resulting in high water temperature at low speeds. 3. Check if the water pump has idling phenomenon: The water pump impeller of the Jetta is made of plastic. If the shaft cracks, it will cause idling when the water temperature is high, leading to high water temperature.