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. Dispose of the fluid carefully and remember: it's poisonous!

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 rough 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 really flushed clean.

Step 3 - Check and replace worn hoses

Undo any hose clips and attachments, joining the hoses to the engine and radiator and pull off the hoses. Throw away any that are split or looking tired and replace with new ones. Use new hose clips where possible (we have lots of those).

Step 4 - Fit a new thermostat

Locate and remove the thermostat housing (usually two or three simple bolts). Lift out the old thermostat and drop in a new one. We have the exact match for your car. Refit the housing with a new gasket.

Step 5 - Refill the system

Make sure all the hoses are replaced and the clips are tightened properly. Close any taps and fill up with new coolant to the correct quantity for your car.