Originally Posted by triple18
so in other words..i have nothing to worry about?
If they changed the LIM gaskets along with the UIM, then you should be OK. You are probably just seeing the cooling system make up for air voids that were created when the cooling system was drained and re-filled when the work was done. Keep an eye on the radiator and recovery tank, though. Within a week or so, the coolant level should stabilize in the recovery tank when checked cold before start up. Make sure the radiator is up to the top, too. If so, you should be good to go.
This engine is notorious for trapping air in the cooling system. We recommend a special fill procedure be used and have included it in Techinfo, for just this reason. You may want to try bringing the car to operating temperature (top radiator hose hot) then opening the bleeder screw on the upper radiator hose fitting at the engine until only coolant (no air bubbles) flows . Rev the engine a bit, maybe to 2000 rpm briefly to encourage movement of air to the thermostat, then bleed it again.