recently had to drain and refill the coolant upon trying to undo the bleed screw on the coolant rail I noticed it was rounded and could not undo it. I was desperate to use the vet for work so filled it up anyways draining air from the heater bleed screw. Is this enough or do I have to drain it...

Hi, Have recently bought a freelander 1 and Noticed the rear light cluster doesn’t light up when the brake is pressed or when the headlamps are turned on, but if I turn the fog lights on they light up. All other break lights at the rear work. Any ideas why this is? Thanks in advanced