Causes of Engine Overheating

Radiator

Over time the tubes and fins of a radiator can become blocked with sediment thus restricting the flow of coolant thru the radiator. The radiator could also develop leaks via punctures in the tubes and fins. Any interruption in the flow of coolant in the radiator could lead to increased engine temperatures and overheating.

Thermostat

The engine thermostat regulates the flow of coolant to the engine block. The thermostat will be in a closed position until an engine warms up then it will open up to allow the coolant to pass thru to the radiator to be cooled down. If the thermostat does not open after the engine warms up then this could cause the engine to overheat because the coolant is prevented from flowing thru the radiator to be cooled off.

Coolant

The manufacturer usually specifies the type of coolant to be used for each vehicle. The use of the wrong coolant or the use of the improper concentration of coolant can cause engine overheating problems.

Belts

A cracked or loose belt could prevent the water pump from operating at its required speed to move the coolant thru the engine. This could cause the engine to overheat.

Hoses

Hoses that have cracks or holes could also impede the flow of coolant to the engine or radiator causing an overheating problem.

Cooling System Channels

If the cooling channels in the engine become blocked by rust, or sediment, this could impede the flow of the coolant thru the engine compartment causing the engine to run hot or overheat. Flushing the cooling system and replacing the coolant per the manufacturers specifications should prevent the buildup of rust and sediment in the engine cooling channels. A flush engine kit contains the cleaning chemicals that remove the rust and sediment.

Radiator Cap

Modern radiator caps are actually pressure valves that are responsible for increasing and regulating cooling system pressure. Improper pressure in the cooling system could cause the engine to overheat.