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2013 XTS
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2,087 Posts
Dude you really should search first.

If it is like the sts there is a drain plug on the driver side under the radiator. You should be able to acess it with a socket and without removing said splash guard. Drain it fill it with fresh and drive it a couple months then do it again this way you will get the remaining coolant in the engine block flushed on the second time.
 
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