I've done something really fucking stupid yesterday....I did all my levels as you do and some how accidentally forgotten to put the rad cap back on stupid I know . We I drove it about 2 miles before I realised as the water was pissing everywhere no heat in car and the temp was rising right up.
Today I filled the system right back up how ever it's still over heating and the interior heaters are giving no heat when I turn off the engine I can hear a hissing noise !? I can see water around the expansion tank how ever I cant be sure if it's water from filling up or not
Anyone able to help please