I'm not sure what degree thermostat. I know I ordered the high temp one from Autozone.com. The needle just went to normal and stayed there but the fan wasn't coming on and the engine was running hot. I'm not sure about the upper passenger side of the radiator...why just the one side? Also, the heat works fine...just like it's supposed to...it's just the fan won't come on.
What are you getting at though? Just curious.