Q: P0116 Code. Engine Temperature is high. Do I have air in my system? Water Pump issues?

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I just replaced my thermostat and Temp Control Sensor for my Saab 9-3 2004 Linear. I also flushed my system and replaced with new fluid. Engine light still on (p0116 code) Before repair I was getting no hot air in cabin and eng Temp was not getting off of L. Now eng temp is between a 1/4 and 1/2 on gauge and hot air is back. Also top hose to radiator is not getting hot after running. Hoses into heater core are hot. I believe it is a pressurized coolant system because everything goes thru the reservoir. I am seeing no leaks. Reservoir level constant. What could be the problem. Do I have air in my system? Water Pump issues? ( but engine is not overheating before/after repair). I just put the Temp Control Sensor in last night and ran the car awhile but engine light still on. Do I need to road test it to get engine temp up for Sensor to kick in? Are there any additional sensors/fuses I need to check related to this? I could not locate any. Thx

My car has 99000 miles.
My car has an automatic transmission.

Hi there. Check the thermostat by watching the coolant temperature gauge. When the engine gets hot and the thermostat opens up, then needle moves down a little bit. If the needle does not move and the system seems to be getting hot faster than normal, then it is suspicious that the thermostat is stuck open. I recommend replacing the thermostat as it can fail at any time. If you need further assistance with your coolant getting hot too fast, then seek out a professional, such as one from Your Mechanic, to help you.

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