[bcrdukes]

Pay attention as you are driving or when you park your car. Pop open the hood and look for signs of coolant leaks at the rad fan/water pump area. It will be most obvious when you smell coolant.

This happened to me - I had a phantom coolant leak, very much like the symptoms you described. I had it pressure tested and it came back good.

Then one day, driving down Kingsway in heavy rush hour traffic, I notice smoke coming out of my engine bay and the coolant temp spike. Had to pull over to find out the water pump's bearings had failed and that was the root cause of my cooling system issues.

I don't want to scare you, and pray that it isn't the same issue you're experiencing because it was an expensive repair (I had to replace the entire system for safe measure.) I would stop changing parts until you can confirm the root cause. Good luck!