What Causes High Temperature in Diesel Engine?
2 Answers
The reasons for high temperature in diesel engines are as follows: 1. Water pump damage: When the water pump is damaged, the coolant cannot circulate in the cooling system, and thus cannot carry away the heat generated by engine combustion; 2. Lack of coolant or use of unqualified coolant: When the coolant is insufficient or completely missing, there is no cooling medium in the cooling system to transfer the engine heat, leading to high temperature. Additionally, modern engines operate at temperatures higher than the boiling point of water. Using water or unqualified coolant as the cooling medium can also cause engine overheating; 3. Thermostat damage: When the thermostat is damaged or stuck, the engine only operates in a small cycle, and the radiator cannot dissipate heat effectively, resulting in low heat dissipation intensity and engine overheating; 4. Fan not working: The fan may not work due to two reasons: one is the fan itself being damaged, such as broken fan blades, stuck fan, or broken fan belt; the other may be a control circuit fault that fails to send operation signals to the electric fan; 5. Dirty radiator surface, poor heat dissipation: When the radiator surface is covered with dirt, heat conduction is poor, and heat cannot be dissipated into the air in time, causing engine overheating.
Recently, my diesel car keeps giving high-temperature alarms, which is really worrying. It's mainly a cooling system issue. For example, the radiator might be clogged with mud or insects, blocking coolant flow and preventing heat dissipation. If the fan belt is loose or broken, the fan won't spin, causing heat to build up quickly. Also, if the thermostat gets stuck, the coolant can't circulate to regulate temperature. Additionally, excessive load can easily cause overheating—like last time when I hauled heavy cargo uphill, the engine worked overtime and heat surged. Aged or insufficient engine oil is another factor, as poor lubrication increases friction and generates more heat. Reminder: regularly check coolant levels and quality, clean the front of the radiator, and if overheating occurs frequently, get it checked immediately. Otherwise, the engine might be ruined, and repairs could cost way more than a few hundred bucks.
