Hey all, so my coolant reservoir is empty (the clear plastic tank) and the level is fine in the radiator. I called the shop I bought it from and they said it’s just an overflow tank so having none in it is not a problem... I’m not sure this seems right because then why would it have a high and low level? And the manual says to add it if below the low level. Should I just add some to be on the safe side or leave it alone? Thank you!