Hi Gabe G,
Thank you for the donation.
The symptoms indicates a micro leak in the cooling system and not a fault with the engine or gaskets.
When micro leaks occurs, coolant is lost and the reserve tank is being sucked in to replenish those lost. Look out for sings of coolant staiins, especially at hose joints and the water pump. Check the radiator drain cork O ring.
If you are not able to detect any leaks, get a pressure test done.
If the coolant was not bled correctly after replacement of the engine, it would also cause the problem. How much coolant have you replenished so far and how often?
Wednesday, March 17th, 2010 AT 8:02 AM