Moin. Volvo 855 model year 1995 engine type B5252FS/S gearbox type M56 305,000km OK. I try it first with the short version (without previous history and the last repertures) and limit myself to my three main suspects: I have strong cooling fluid loss and do not know where the water goes. In addition, very high pressure in the cooling system already after 20km drive. This is expressed in clear Gurgel noises from the cooling water balance tank. The liquid rises to under the De The fan runs through as soon as the operating temperature is reached. In urban traffic and also over land it can keep the temperature. If I scare it a little bit, the temperature rises noticeably, but also falls quickly again, as soon as the spray supply is lowered. Engine off, fan off – no recooling. On engine off, ignition on it cools after. After a short cooling time a valve seems to open somewhere and makes the balancing tank in about 20 secun the empty. Where? I don’t know. Sometimes I have a spot under the car, but mMn. too little for the liter that creeps up there. In the changing weather difficult to determine. At least the position of the spot coincides with the wet radiator ribs (see photos). Cooler torn? The lid of the balance tank is just new. I had a gray (opens at 1 bar?) now a green (opens at 1.5 bar?). Can that be a reason? 3. Suspect – Thermostat. Ideas – Experiences – suggestions, sweetens me the weekend ——mod——– Pictures removed at the request of TE ——-mod—–