hi guys.. My first post comes after i washed my car today and topped up the water level a tiny bit. since topping the water up, i have noticed that there is no hot air coming through the blowers. This has happened before and i resolved it by fiddling with controls and turning the blowers off then back on again but now im finding that after resetting the blowers, changing temp from hot to cold then back to hot.. Theres still no hot air coming out. My car has air con but i ensured this was switched off...im thinking there might be an air lock in the system? Or heating matrix...? Anyone have similar problems? (mine is a mark 4 sport) cheers.