Coolant sensor goes off at random times?

[Max777]

Well, I just did a coolant system overhaul because my car was overheating: I put in new hoses, new thermostat, new thermostat gasket, new hose clamps, flushed the rad with distilled, and took the AC condenser out that was blocking airflow to the rad. (Also, I drained the block, and the rad. coolant came out pretty dark, but maybe it's just the Presone Radiator cleaner I put in there?

Right now, when I start my car with the water level all the way filled, and the cap off, coolant DOES NOT burst out of the rad with "excessive force"
I had a thermostat gasket leak before, and the car would not "siphon" the coolant back out of the reservouir, but now that I put a new gasket in, it does it just fine!

Ok, so I start it, warm it up, and drive it around a bit. after about 10min or so, my coolant buzzer goes off, and sometimes STAYS on, while other times, it shuts off, and later comes back on. It's really intermittent, but the car has done it both times I drove it after I redid the coolant system.

Now, notice, the original owner said that the coolant buzzer went off on him too, and he couldnt figure it out. So, he took some wire and just grounded it to the - post on the battery. I hooked it back up, and now it does this.

I'm kinda confused, and think that my engine blew a coolant seal.

Also, there is a "gasoline" kinda smell in my oil. I just changed it about a week ago, and havent really been driving the car too often, but I let it warm up every time, and drive well, too.

EDIT: And I did "let engine idle with rad cap off and heater system set to high to bleed it"