can a bad coolant reservoir cap cause 2012 spark overheating?

Hello, theoretically, a coolant reservoir cap - if rated to a certain pressure, like a radiator cap would be - that is not performing as it should be, could contribute to cooling system overheating, as coolant flow wouldn't be as desired. I'd look, however, at #3 in your story - why is your cooling fan not turning on? That is a prime candidate for concern. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops