I believe that LIM indicates a "lower intake manifold" gasket???? If so, no I have never torn into the motor to replace gaskets. I have not seen anything unusual when changing oil that would indicate an internal leak of coolant that would degrade the viscosity of the synthetic oil that I use. In other forum posts I have read that the idiot light for low coolant was generally a sensor which commonly failed on 1997-2003 Grand Prix models.
I have never seen puddles of coolant or anything else that signals an external leak. Is there any other way of testing before I tear into the motor?
