Top it up (50/50 mixz) and keep an eye on it.  If it
sucks back some coolant, then  you have to top it up
again AND bleed the system as if it has been sucking
air from the expansion tank, then you have air in the
system.

I'd suggest the "easy bleed" method.  Just drive till
hot and with the engine ideling (or reving) crack the
front bleeder scew on the Radiator (13mm bolt) and
listen for the HISSSssssssss till you get coolant.  Do
that a few time (from cold to hot bleed, cold to hot
bleed etc) and keep the expansion tank toped up and
after a while you'll be OK.  I hope!     Malcolm

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