my w202 2000w c200 has been leaving a 6inch x 6inch pool of fluid,too thin for engine oil,under front of engine for last 48hrs......power steering level ok brake fluid level ok but cant check autobox cos dipstick is missing my haynes manual says dipstick was an optional extra.....what can it be? does aircon have fluid.....it is dripping through small hole in the drip tray under front of engine on the nearside there are alot of pipes in that area..any advice