Today my engine fan stays on full whilst driving then when parked (car is not overheating atall,the engine is cold),manage 3 small trips leaving car for half an hour each time,the last time it wont start,get it jump started all ok but fan stays on,1 mile on at 30mph loses all power,pull over the engine turns over but wont start,battery goes flat,try to jump start again,nothing will work.Would really appreciate any advise.