What causes overheating

Overheating engines are a common problem for motorists during the hot summer months. No one wants to experience the frustration of engine breakdown and costly repair bills due to a failed cooling system. That's why it pays to check your cooling system regularly and change the coolant as required.
The most common causes of engine overheating are:
Low coolant level
Faulty thermostat
Faulty coolant fan
Leakage
Faulty water pump
Broken water pump fan belt
Blown cylinder head gasket
If you haven't changed your coolant for a while or you're heading off on a long trip you should take the time to service your cooling system by following the simple instructions below.
What you will need
CoolantRadiator flushRagsHoses

Step 1: Drain the cooling system

First allow the system to cool down! If there are taps fitted to your radiator and engine block, open these and remove the radiator cap to relieve the pressure in the system.
Alternatively, remove the bottom hose to the radiator and allow the system to drain. Catch the old fluid in a suitable pan or container.

Step 2: Flush the system

Refit any hoses and close the taps. Pour the contents of a can of radiator/cooling system flush into the radiator and top up with clean water. Run the engine until warm and then allow to cool before draining the system again. You may see quite a bit of rust deposit and sludge come out with the water. Preferably, run a hose through the system with the taps open to make sure the system is fully flushed.

Step 3: Check and replace worn hoses

Once the system has been completely drained, thoroughly inspect all hoses, clamps and fittings. Check rubber hoses for signs of splitting, swelling or deterioration. Metal fittings should be checked for evidence of cracking or corrosion.
Your local Supercheap Auto store will be able to help you with the new parts to replace the worn or broken items.

Step 4: Refill the system

Make sure all hoses, fittings and clamps are secure and ensure drain tap/s are closed. Refill the system using the correct type and amount of new coolant. Supercheap Auto team members will be able to help you find the right coolant for your car if you are unsure.

Step 5: Check coolant level

Regularly check the level of coolant, especially before long trips. It is normal to have to add coolant occasionally, but the need for regular addition suggests there may be a leak or another problem.