I would recommend raising the front of the Tiger somewhat so that the air return to the resevoir is just as high as the heater core.This was an old blacksmith trick.I still do it when for some reason I have drained the coolant.As it gets full give it a few minutes.Remember your thermostat is closed so it needs the extra few minutes.Then most likely you will be able to top the coolant up.
You do not want the resevoir almost full as when you lower the car it will add up into the resevoir
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