Hi, I have some problems with my cooler temperature indicator with my B4 with ABB engine. But don’t know exactly what it is. Maybe one of you can help me: For a defective thermostat speaks: -Temperature stays at normal temperatures in normal temperatures almost zero (pin doesn’t blow out) -Is it hot and you may still drive in traffic jams with frequent start-up the temperature indicator goes up, even over 90°C. -After a longer “normal” ride the needle beats a minimum (below 90°) Speak for a defect Voltage constant: Tank indicator spins too. Shows what she wants but never too much. Upper hose that leads to the cooler gets hot much faster than the lower one. the heating works wonderfully. What do you think might be broken?