Any time your cooling system can’t cope with the amount of heat being generated, it puts your engine and risk of expensive internal failure. Patching up your cooling system on the side of the rack is one thing. But if your 4WD severely overheats you could be in all sorts of trouble. Blown hoses and radiators, warped or cracked cylinder heads, blown head gaskets or even worse a seized engine can all result from an overheating engine. Overheating can be caused by many different problems. Some can be visible, but often the cause is hidden inside the system.
An engine running below is operating temperature will wear out a lot quicker than an engine that runs hot. A common fault for a thermostat is to jam in the open position. While the engine won’t usually overheat, it will always run cold and can be more harmful in the long run. A frequent short trip, where the coolant doesn’t get a chance to warm up to normal temperature has the same effect on the engine. The carbon deposits inside each cylinder aren’t burnt away and can build up rapidly.
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