<https://caddyinfo.ipbhost.com/topic/58314-2009-cts-obd-code-p013a/#comment-257811>
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"For diagnosing the cooling fans, generally there are two.    The classic test is if it overheats while sitting still but not while moving, suspect the fans since they are what keeps air moving sitting still.  You may be able to carefully, observe the cooling fans by looking down to the back of the radiator under the hood. \n \n\n\n\tThis video discusses cooling fans\n \n\n\n\t\n\t\t\n\t\n\n\n\n\t \n \n\n\n\tHowever, don't replace ANY parts until you diagnose what is wrong.  First (carefully) with the engine running and A/C on, observe if the cooling fan is running.\n \n"
<https://caddyinfo.ipbhost.com/topic/58314-2009-cts-obd-code-p013a/?tab=comments#comment-257859>