I have a 2012 Nissan Maxima S, I recently fixed the water pump but i noticed I was losing coolant still. No leaks. I replaced my radiator cap because it was damaged but now all my coolant went back to the reservoir. I just fixed my thermostat but the problem is still there. All my coolant goes back to the reservoir and the radiator is empty. Need help. Do I need to bleed my coolant system?

 

I don't think I understand correctly. You say you filled your radiator after that work, you can get coolant to flow to the overflow tank, can find no leaks. I would raise the front, with the engine cool, fill the radiator proper, now lower the front, with car running and getting warm, turn your heater on high. This will certainly bleed your system. If you are still filling your reservoir but not having the coolant come back to the radiator, you have a leak somewhere. (Mine was at the neck where the filler cap attaches. That assembly was cracked and of course, if you can't maintain a sealed system, you will not be able to retrieve the coolant from the overflow tank. Look real close at that neck/manifold assy. it is a weak link. But you most certainly have a leak somewhere.

 

a coolant leak has a sweet smell ,,whenever you smell that odor ,,yes there s a leak somewhere
only smell it when engine is hot