![]() And, that is to keep the engine temperature, within the normal range. Furthermore, the thermostat must be doing its job. And, that requires the help of an effective engine cooling fan. So, the radiator must be capable of doing its job. The coolant also has to get rid of the heat it soaks up, while passing through the engine. So, the only way to do that is, to keep the coolant in constant circulation.Īs soon as the circulation stops, temperatures begin to rise and the engine starts, to overheat. The only way to cool hot metal, therefore, is to keep it in constant contact, with a cooler liquid. Heat always flows, from an area of higher temperature, to an area of lesser temperature. An eroded or loose water pump impeller.Because, of too many deposits, in the water jackets. Poor heat conductivity, inside the engine.Loss of coolant (through internal or external leaks).Common Causes, Of Car Radiator Overheating: Then, try to find and fix the cause, before risking further damage. Advise your customers to stop driving at the first sign of overheating. Never ignore a warning lamp or gauge, showing a high temperature reading. Finally, if coolant gets into the crankcase, you can kiss the bearings and bottom end of the engine goodbye. Furthermore, which can damage pistons, valves and other valvetrain parts. This, in turn, may cause valves to hang open. Exhaust valve stems, may stick or scuff in their guides. Pistons may swell up and scuff or seize in their bores. If the coolant gets hot enough to boil, it may cause old hoses or a weak radiator to burst. Overheating, Is Also A Common Cause Of, OHC Seizure And Breakage This will cause a loss of torque in the gasket, letting coolant and combustion leaks to occur. The typical aluminum head, swells most in the middle, which can crush the head gasket. Also, areas that have reduced coolant flow, like the narrow area that separates the cylinders. Like those between exhaust valves, in adjoining cylinders. The related stress, can distort the head and make it swell, in areas that the are hottest. Because, heat makes aluminum swell, almost three times faster, than cast iron. A blown head gasket, can also be a result of overheating. Hot spots, can also be very bad and burn holes, right through the top of pistons. The erratic combustion can cause detonation, as well as engine run on, in older vehicles with a carburetor. Hot spots develop inside the combustion chamber, that become a source of ignition for the fuel. Overheating can also cause, pre ignition. If the detonation problem continues, the hammer like blows, may damage the rings, pistons or rod bearings. Because, the combination of heat and pressure, exceed the octane rating of the fuel. The engine will ping and start to lose power, under load. If the engine overheats, the first thing that will happen is, a gasoline engine will start to detonate. Consequences, Of Your Radiator, Overheating That’s why, anytime temperatures climb beyond the normal range, the engine is running, in the danger zone. As a result, they are very vulnerable, to heat damage. ![]() ![]() However, such engines don’t handle higher than normal temperatures well. ![]() Plus, many engines today, have aluminum heads with overhead cams. Valve stem to guide clearances are also closer, to reduce oil consumption and emissions. Piston to cylinder clearances are much tighter, to reduce blow by for lower emissions. A radiator cap rated at 15 psi will, increase the boiling temperature, of a 50 50 mixture, up to 265 degrees. Above all, for proper emissions control, good fuel economy and performance.Ī 50 50 mixture of water and ethylene glycol antifreeze in the cooling system, will boil at 225 degrees. So, How Hot Is Too Hot Temperature Gauge Reading Too HotĪ relatively constant operating temperature, is absolutely needed. But, ceramic is still too expensive, for everyday applications. Consequently, they’ve realized some significant gains. All in an attempt to build high temperature, super effective engines. Engineers have been playing with exotic ceramic materials and metallic ceramic alloys. But, there’s a limit, because aluminum pistons and heads, can only get so hot, before they soften and melt. Ironically, the hotter an engine runs, the more effective it becomes. As a result, causing the radiator and engine to overheat.įirstly, the average gasoline engine, is only about 22 to 28 percent effective. So, this means that coolant cannot pass through and flow properly. The primary cause of a overheating radiator, is debris and sediment building up and causing a blockage. ![]()
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