The first thing you should look for is vacuum leaks.
Has your coolant level been dropping as you drive the car (i.e. is the level when the car is cold lower than it was yesterday when the car was cold)? Is there oil in the coolant or coolant in the oil?
Coolant surge in the reservoir could be caused by air in the system. Try bleeding the system to see if there's any trapped air.
Last edited by Bullet Ride; 04-02-2012 at 03:32 PM.