What Causes High Temperature in Diesel Vehicles?
2 Answers
Diesel vehicle high temperature is caused by coolant flow rate, poor heat dissipation capacity, and engine load. Below are detailed explanations: 1. Coolant flow rate: Insufficient coolant, thermostat sticking or malfunction. Water pump damage or drive belt slippage leading to poor pump performance. 2. Poor heat dissipation capacity: Excessive scale deposits in radiator, cylinder, and cylinder head water jackets reduce cooling efficiency. Heavy scaling also narrows circulation passages, decreasing coolant volume in circulation and reducing heat absorption capacity from cylinder block/head, resulting in overheating. 3. Engine load: Poor diesel engine operation or prolonged low-speed overload operation causes engine overheating and elevated coolant temperature.
I'm very familiar with diesel engine overheating. The most common cause is a malfunction in the cooling system, such as a leaking radiator or insufficient coolant—if it's below the minimum line, heat dissipation fails. If the water pump is stuck or broken, water flow stops, disrupting the entire system's circulation. A non-functioning fan is also a major issue; the belt might be broken, or the motor could be faulty and needs checking. Low or degraded engine oil increases friction heat due to poor viscosity. A radiator surface clogged with dirt and dust prevents heat from dissipating. Overloading, like climbing hills or towing heavy loads, strains the engine and makes it prone to overheating. For prevention, regularly change coolant and engine oil to keep them clean—don't slack off. If overheating occurs, stop to cool down—don't push it, or you risk engine damage.
