i put some ready mixed antifreeze into my mums car (fiat brava) when we had all the snow cos the heating packed up...sorted the heating by bleeding the system and it was fine now its gone cold again its packed up and jus been out to have a look an the ready mix has basically turned into throff like a head off a guiness ....any ideas why this has happend ? also found its got a slight leak from water pump again ....any ideas thanks