Hello everyone. I have an 07 outback. It has about 124,000 miles on it , bought it last year. I replaced the radiator recently now I'm experiencing a fluctuating temp gauge , the radiator pushes the coolant into the reservoir tank and then the heater blows cool air. The thermostat is new from Subaru. I can't figure it out , I am assuming there is air in the system but I have no clue how to solve this issue ..please an help is appreciated .