I have a 2012 Tahoe LTZ. My engine cooling fan kicks on within 30sec to a minute after starting my vehicle. It'll do it if its sat all night, all day at work, or even if I've been in the store for a little bit. While driving it will turn off and then turn back on high. Is there anything I should be looking at other than Engine Coolant Temp sensor? Temp on dash never exceeds 210.