Yes, matter of fact that is a good idea if you lose coolant but cannot trace it, a lot better than starting the car and risking ruining the motor.
If you are losing coolant, you'd pull all plugs, and crank it by hand, if you can tell there is fluid/coolant in the cylinders then I'd go ahead and do the LIM job, and change the oil.
There are but so many places the coolant can go, if no external leaks are visible my money is on the LIM Gasket, I have seen them fail as early as 50k miles, mine made it to 133k, a good part of the gasket disintegrated as I removed it, it was bad.
2006 Pontiac Grand Prix GT with SC
1996 Buick Park Ave NA