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3.2 - Coolant Replacement ( )

It is recommended that coolant be replacement every two years, as the anti-oxidants lose their effectiveness over time and leave the cylinder head at risk of corrosion. This in turn reduces cooling effectiveness and promotes head gasket failure.

Early models were also susceptible to a build up of sludge in the heater matrix, reducing heater effectiveness. The problem appeared to stem from the type of long life antifreeze used, and the best avoidance method is to use regular anti-freeze and change at two yearly intervals. Systems with the problem can be diagnosed as having a low heat output, assuming the engine is hot and the system set to defrost mode, and can generally be cured by repeated flushing.

Unless it is desired to completely flush through the system, it is not necessary to remove all engine drain plugs and remove the total amount of coolant.

The majority of the system can be drained by removing the header tank cap and disconnecting the lower radiator hose. The rush of fluid out of the system will also tend to pull any suspended particles with it.

Replace the hose and refill the system with a 50% mixture of quality anti-freeze and preferably distilled water. The exact percentage can be varied dependent on temperatures in your area, but it is safest to assume the residue of coolant in the engine is ineffective ad also bear in mind that as anti-freeze is less effective at cooling the engine than water, the mix should not exceed 65%.

Run the engine up to temperature with the header cap removed and heater switched to full to ensure any air pockets are released.


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