In short, the Volvo T5 switch, 855, has LPG, but has not been in operation for a long time, so that there is an overpressure in the system DESWEGEN due to a defective evaporator I guess not! Bubbles rise through the upper hose,the thin one to the balance tank, water goes somewhere flutes… the heat exchanger is DEFENITIV with the connections in the *****! the question is only if he can lose 0.5-1 liter on the day? the car does not smoke, no mud at the wedge bar or cover, no oil visible in the water, after exhaust smells also not, power is available with the car, heating is also warm to hot!! just what I noticed yesterday, that the temperature indicator has to “fight” to, it rises from the very bottom, and after about a 1-2 cm it jumps down again briefly, up, down, down, and then it rises to 3 clock and stays also on 3 clock!!! What has come new, engine cooler, had a hair crack along 10 cm approx.!! he with lid, original bought at volvo dealer! Thermostat from Whaler , new, temperature sensor from a working 850er!! just the cable or plug had or have a waxer but it can’t lie there… fill the water level on MAX and after 1 day drive a bit of city and stand around is in the evening the stand on MIN! … If I open the lid during hot operation, yes not the best I know, it hisses very briefly, clearly overpressure, then cover closed, cover closed to and then the water rises again to just above max… but so that it is impossible to discharge the balance tank or that it really bubbles or one hears a cooking or other things while driving, is not!! only sometimes when I turn off the car you hear a bubble from the tank, in the driver’s room well noticed! but at the tank around everything is dry… that makes me crazy… doesn’t have to be the ZDK?!! the heat exchanger loses water, sh eibe attacks minimally and it smells like frost protection or coolant in the inside room… but I just can’t see where it’s made! parts are ordered, but come only on Wednesday… carpet up relatively dry… but under the carpet all these foam and fabric mats are fully sucked with water…