The smell could be that when the parts were replaced, coolant was spilled around in there and the fans are blowing the smell of it around.
Top off the coolant and see if it goes down again.
Maybe when thing were replaced, the thermostat never opened and more coolant was needed in the system.
Watch the level and see if it changes. I had to top mine off a couple times after replacing my thermostat. Now it's fine.
Your gauge never goes past 130*? It should go to 200*F and stay there once fully heated up.