Hello im new to the bmw world. I have a 1992 325is.. It used to overheat while stopped for a while now its doing it more often .. I changed the fan clutch and thermostat and it seemed to work good.. But then overheated again.. Changed waterpump fanblades.. And same thing.. Im thinking radiator... When the car is at temp i feel the upper hose and its hot yet the lower hose feels cold but theres pressure .. I removed the thermostat while hot and it was open bit no signs of water.. I removed lower hose from radiator and only a small amount of water came out.. Any suggestions...