BMW e 36 320 Overheating unclear

Hi, I’m new here and really looking for help. I drive a BMW E 36 320 bj 93 Now I bought the car for the first time on the way back of 200 km the V-belt flown down and the water pump was also quite easy So I renewed water pump and V-belt. Drive a little and remember now the engine is constantly hot 1. New water pump, V-belt, thermostat (cooling water as well as normal water enough on it) 2. Heating does not overheat motor constantly so I keep it 3. He is ventilated, however, the hoses remain cold รบnd are totally bulging and hardly to press.(hard) I would like to know if anyone else has any idea what could be with my baby ๐Ÿ™ especially in winter I need my heating.