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"When you say 'fit a bigger rad', I guess this has to be sourced at huge expense from Caterham? I may give rad flush a go, but reading this section indicates that bleeding the system afterwards could be a nightmare."
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Bruce
At some point you will have to change the coolant so this would be the best time to change the rad. Maybe someone upgrading to an ali rad would have an old style "bigger rad" on offer?