Found out what was wrong with my mums 2000 year old seat (okay its a 96) , thermostat . She stopped at a garage (well known robbing /poor work) and some numpty looked at it , took rad cap off so it dumped water everywhere and then said £600 to do the head gasket!! Topped the water up this morning and ran it till hot, top hose red hot and rad stone cold . Took thermostat out (in bits!) and its fine.Rang local parts place for a new one, its to old we cant find one. Quick look on the bay and its the same part from 95 to 2015 , £10 and its in the post.