my 2005 has disappearing coolant ,??? added 2 gallons today ? it does not smoke , oil is super clean , water pump is not leaking ? where is it going ?? HELP ?
If yes to the above question.....Then most likely your have a head gasket problem. If the hose is rock hard after sitting all night then Head Gaskets usually are the problem....
The early LBZ's have the same issue. They have been through several different headgasket designs. I believe heat cycles is what kills them. And since LLY's are known for there ability to run hot I believe that's one of the reasons the LLY's have the most frequent failure.