That's not the way to clear the air out. If you have a recovery tank you have a closed system. What you need to do is run the car for a while and do not open the main radiator cap, just refill the recovery tank. It will purge itself and suck only coolant back into the radiator. Also, make sure your radiator cap is higher than the rest of the system so the air will go to the highest point.

Reason I sort of know about this is we have run into the same problem burping the Olds engine in my Sons rpu. Whenever we would remove the radiator cap for any reason it would introduce air into the system and the car would immediately go to 230. But after it cooled for a bit and sucked the recovery tank almost dry it would never go over 190-200 again, and that was on a hot day (90+). All we would do is keep the recovery tank 1/2 full so it wouldn't puke and it cooled fine.

Don