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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