What does low engine coolant temperature mean?
1 Answers
Low engine coolant temperature means the coolant is continuously circulating through the main circuit, causing the water temperature to drop. Reasons for low engine coolant temperature: It may be due to the thermostat remaining in the open position, causing the coolant to continuously circulate through the main circuit and lowering the water temperature. Generally, excessively low engine water temperature is caused by a faulty thermostat that cannot close or a malfunctioning cooling fan that remains constantly running. When the thermostat valve fails to close, the coolant keeps circulating through the main circuit, causing the engine water temperature to drop rapidly. Solutions for low engine coolant temperature: First, check the operation of the cooling fan. For engine belt-driven fans, if the fan speed increases along with the engine RPM and produces loud noise, it indicates the silicone oil fan coupling has failed and its driving and driven parts are fixedly connected, requiring replacement of the silicone oil fan coupling. If an electric cooling fan is suspected to be faulty, check it while the engine is running. Observe whether the fan starts prematurely before the coolant temperature rises, or if it runs continuously regardless of whether the engine is cold or hot, indicating a fault in the fan control circuit. In this case, unplug the wiring connector of the coolant temperature switch. If the fan stops after unplugging, the coolant temperature switch is faulty and needs replacement. If the fan continues running after unplugging, the relay or its wiring is faulty and should be inspected. If the fan operates normally, check whether the thermostat is faulty or has been removed manually. Replace it if any abnormality is found.
