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What Can Make an Engine Overheat?


Overheating is caused by anything that leads to a loss of coolant, prevents the cooling system from getting rid of heat, or causes excess heat in the engine itself:

► Coolant leaks (water pump, radiator, heater core, hoses, freeze plugs, head gasket, engine internal).
► Cooling system clogged (deposits built up in radiator or in engine due to maintenance neglect or use of hard water). Use a cleaner, then reverse flush system to clean it out. A badly clogged radiator may need to be rodded out or replaced.
► Weak radiator cap (does not hold rated pressure and allows coolant to boilover). Pressure test the cape to check it out.
► Thermostat stuck shut (replace).
► Inoperative electric cooling fan (check fan motor, relay and temperature switch for correct operation).
► Bad fan clutch (replace if slipping, leaking or loose).
► Missing fan shroud (reduces cooling efficiency of fan).
► Slipping fan belt (tighten or replace).
► Too low or too high a concentration of antifreeze (should be 50/50 for best cooling).
► Bad water pump impeller eroded or loose - replace pump).
► Debris in radiator (remove bugs and dirt).
► Collapsed radiator hose (check lower hose).
► Late ignition timing (reset to specs.)
► Restricted exhaust system (check intake vacuum readings and inspect converter, muffler and pipes).
► Radiator and/or fan undersized for application

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