Dash temp gauge never got over 60-70 unless sat still revving it (as soon as moving again it would drop) so changed coolant temp sensor, still the same. So put in a new German Wahler thermostat. Now temp goes to 90 and sticks there like glue. However the lower hose coming from the thermostat still seems cool even when car been running at 90 for 45 mins! Is this normal? My heater inside blows hot. I presume my new stat is opening ok otherwise it would overheat? So surely the hose coming from the stat housing should be hot, or warm? Do I have an airlock or circulation problem? It doesn't feel like there's even coolant in the hose coming from the thermostat when squeezed. Shall I try bleeding it more thoroughly? Or does the fact the temp is behaving so well rule anything bad out?