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Questions often come up in the forum about the automatic HVAC system in the 2008+ CTS, with regard to how certain items have been designed and set up to operate. An example are the heated seats, such as the conditions in which they will switch on automatically on Remote Start activation. I found an interesting document in the CTS service manual that describes, in considerable detail, the features and operation of automatic HVAC and related inter-linked systems. Thought I'd share this with everyone. Here's a link to the document: http://www.mediafire.com/view/?626245gdsc674ia