Thermostat temperature is 87 C so it's definitely intended to get hotter than 85.
If you have it mostly full and the heater is making heat, extensive "burping" should not be needed. Park on level ground, wait until it is completely cold, then before the next trip remove the radiator cap and check / top up the radiator. Do this a few times until you see it is staying full.
The sensor in the bottom of the radiator controls the fan. Thus it is driven by the temperature of the coolant in that part, not the engine. It takes a very long time sitting idling for the whole radiator to heat up enough so the fan trips on. It may never happen in cold weather. To confirm the fan works, you can unplug the sensor and jump the car side with a piece of wire. Fan should start immediately when the key is turned on. This is the larger fan, on the right side of the car. The smaller one only runs for the A/C. A/C should activate both fans, but that really can only be tested in hot weather.
If you have it mostly full and the heater is making heat, extensive "burping" should not be needed. Park on level ground, wait until it is completely cold, then before the next trip remove the radiator cap and check / top up the radiator. Do this a few times until you see it is staying full.
The sensor in the bottom of the radiator controls the fan. Thus it is driven by the temperature of the coolant in that part, not the engine. It takes a very long time sitting idling for the whole radiator to heat up enough so the fan trips on. It may never happen in cold weather. To confirm the fan works, you can unplug the sensor and jump the car side with a piece of wire. Fan should start immediately when the key is turned on. This is the larger fan, on the right side of the car. The smaller one only runs for the A/C. A/C should activate both fans, but that really can only be tested in hot weather.