hi can anyone tell me why my engine fans start up when i first start my car from cold they go on for about 2mins. and lately the car is having trouble starting. its a a4 sport auto 2002. the engine managerment light as come on i get it reset after replacing a pipe whitch had air coming out of it but it go`s off for afew days then back on again. ive been told it may be a coolant sensor but havn`t a clue were to locate it. any help would be much appersheate before i go to a audi dealer and pay over the odd.