I have a Scorpio Ez 3/92, 2l DOHC 88KW/120 hp. The heating barely got warm and the hose from the thermostat to the cooler is not really hot. The coolant temperature indicator has been standing since I bought the car (at 178000 km – today 202000 km) always at the bottom of the white field of the indicator. Strange was and is that the temperature indicator even in the city traffic and in the traffic jam does not increase a little, but even further down to just below the white indicator field could also the coolant temperature sensor be defective? The heater only worked half-way if it wasn’t exactly cold. I changed the thermostat and installed one of ATU. My old thermostat had a vent valve, which was not from ATU. Was that a wrong one? I then let the engine warm up. It only came out of the ventilation nozzles for a short time. Otherwise only cold air. The hose to the cooler is now really hot. I often read about a heating control valve. Does the engine have one? I have no air conditioning. Where does it sit? Could the problem be this, or is it just the exchange of the heater cooler (heat exchanger)? Who can help and has had similar problem?