I have a 2004 Fiat Doblo 1.9JTD which has been brilliant to date. The other day I was going up our drive and suddenly the clutch felt odd and the car would not go into gear. I've checked the break/clutch fluid and there is no fluid loss. I'm assuming something has gone wrong with the clutch hydraulics (although I can't see where anything is in the engine compartment) Any ideas on what the most likely fault is?