How to Diagnose Engine Overheating

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How to Diagnose Engine Overheating

Engine overheating happens when the balance of the cooling capability of the engine and the heat generated when the engine operates starts to deteriorate. When this balance is deteriorating it will extremely increase the coolant temperature that causes the coolant to boil.


The coolant will be boiled into steam and spew out from the deteriorated portions like the reservoir or radiator. Continuously running the engine at this condition will damage the engine.

What to do when Engine Overheats?

1.If the car can be move, move it safely off the road and away from traffic, park the car.

2. Continue run the engine, do not stop the engine. Because when the engine is stopped the water pump will also stop working and the flow of the coolant from the reservoir into the engine will also stop. The coolant will stop circulating around the engine but continues to receive heat coming from the engine and will continue to boil in that condition thus overheating will not be resolved.

3. Open the hood so that the air will help to cool down the engine.

4.After the temperature indicated on the temperature gauge goes down then stop the engine.

5. Request the car dealer for any assistance.

What Causes Overheating?
Malfunction of cooling system

Poor Heat Transfer
•The water pump is malfunctioning because of a worn or loose drive belt.
•The thermostat and water control valve stuck is closed.
•Damage fins because of dust or air contamination.
•Clogged radiator cooling tube because of excess foreign material Reduce airflow
•The fan assembly is not working or not operating.
•Resistance when the fan rotates
•The fan assembly suffers from damage blade

The radiator shroud is damage
The engine coolant mixture ratio is not appropriate, check the engine coolant specific gravity Poor quality of engine coolant

Insufficient engine coolant
•The engine coolant is leaking because of the loose clamp, crack hose, poor sealing of water pump, poor sealing or loose radiator cap, damage o-ring of the radiator, cracked radiator core or cracked radiator tank, cracked reservoir tank.
•Overflowing reservoir tank. No malfunction of cooling system

Overload on engine
Abusive driving causes overheating when, the rpm is high at no load condition, driving at low gear for an extended time, driving at extremely high speed, the power train system is malfunctioning, installation of improper wheels and tires size, and improper ignition timing.

Block or restricted airflow
The bumper is blocked, blocked radiator grill due to mud or paper clogging.

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