The yellow ''Coolant Low'' light appeared 13 months after a new radiator was fitted. I have received conflicting information saying that it is ''normal'' to use a bit of coolant. However if the light reappears in a short space of time have a pressure test. I have done more than 1000kms in temps. touching 40 without any loss. Do I wait until the light reappears or do I go for a pressure test which could be a waste of money at this stage?