The coolant specification has to be traceable. The most common mismatch comes from antifreeze requirements, material compatibility, and top-up methods being recorded at different times, so keep the dates. If coolants of different formulations are still being mixed in after the change, both the original approval date and the responsibility signature need updating. This import order checklist links the handling of the coolant specification change to earlier steps. The basis for lifting the hold on the coolant specification must be written down as well.