What Causes Low Coolant Temperature in Audi?
1 Answers
Audi vehicles experiencing low coolant temperature are generally caused by a faulty thermostat or a constantly running cooling fan. Inspection Methods: When the vehicle's coolant temperature is low, it is necessary to check: the coolant level and whether it has deteriorated; the engine oil level; whether the radiator is blocked by foreign objects; whether the fan blades are deformed; whether the coolant temperature sensor and its circuit are functioning properly; and to perform a disassembly inspection of the thermostat. Solutions: The thermostat is a component that automatically acts as a valve based on the engine's coolant temperature. It is usually installed at the outlet of the radiator and the inlet of the water pump. When the coolant temperature is low, the thermostat blocks the low-temperature coolant from the radiator, preventing it from entering the engine water jacket. This allows the temperature in the water jacket to rise quickly, known as the small circulation. When the coolant temperature rises to a certain level, the valve gradually opens, allowing the coolant from the radiator to circulate again. This enables the coolant to flow through the radiator, slowly increasing the temperature while dissipating heat to the atmosphere through the radiator, maintaining the engine's coolant temperature at an appropriate level, known as the large circulation.
