What are the solutions for high water temperature in diesel engines?

[Ariana]

Solutions for high water temperature in diesel engines include: 1. Sealing the thermostat; 2. Inspecting and repairing the fan operating circuit; 3. Replacing the radiator thermoswitch; 4. Adding coolant; 5. Cleaning debris from the water pump. The working principle of a diesel engine involves compressing air to generate high heat, atomizing and injecting diesel through the engine injector to create explosive expansion inside the engine, thereby driving the piston to work. Diesel engines are categorized into: 1. Spark-ignition engines: Gasoline engines inject gasoline into the intake pipe, mixing it with air to form a combustible mixture that enters the cylinder and is ignited by the spark plug to expand and perform work; 2. Compression-ignition engines: Diesel engines directly inject diesel into the engine cylinder via the fuel injection pump and nozzle, where it mixes uniformly with the compressed air in the cylinder and spontaneously ignites under high temperature and pressure, pushing the piston to perform work.

[VonElliot]

I've been driving for over 20 years and encountered diesel engine overheating three or four times. The most crucial thing is to immediately pull over and turn off the engine—don't worry about wasting diesel. When opening the hood to cool it down, never touch the radiator cap, as boiling coolant can spray up to three meters away. Wait until the temperature drops below 60°C, then slowly loosen the cap with thick gloves, releasing pressure in stages. Only add room-temperature distilled water for emergencies—half a bottle of mineral water will suffice. If the fan belt breaks, call a tow truck directly. Frequent temperature warnings indicate potential issues like a stuck thermostat, clogged radiator, or water pump leakage. Last time, I got caught out by willow catkins clogging the radiator.

[DeNicole]

Last time when I was driving the truck uphill, the temperature gauge suddenly shot up to red, which scared me into turning the heater to maximum. Although I was sweating profusely from the heat, this trick helps cool down the engine. After stopping, if the lower hose feels ice-cold, it means the thermostat isn't opening. If bubbles appear in the expansion tank, it might indicate a blown head gasket. I clean the dead insects off the radiator fins every three months and change the long-life coolant annually. The water pump belt tension should be adjusted so it can be pressed down about 1 cm. Both too much and too little engine oil can affect cooling—these are details every car owner should pay attention to.

[Shelly]

The fan's operation is crucial. After a diesel engine shuts down, the controller will delay the fan's stoppage. The coolant level must be maintained at the midline. Mixing antifreeze of different colors can cause gel formation. If water is added temporarily, remember to thoroughly flush the cooling system afterward, as excessive scale buildup can halve the cooling efficiency. Vehicles with modified intake systems are prone to overheating, especially since turbocharger temperatures can easily reach 600°C. Before long trips, check if the radiator cap's sealing ring has aged, as insufficient pressure can cause the engine to overheat prematurely.