Hey all,

Simple question I hope. I'm going to do a coolant flush on the truck and I need to know what temperature thermostat to use. I know its basic...but I am getting conflicting stories on my end on which to use. What (if any) advantages are there to using different temp thermostats? I'm about to make a long haul up to Sequoia, so i need to get this one right.

It's a 1989 Suburban, 5.7L with less than 100K miles.I've never had any overheating issues in the past, but the coolant is looking pretty gross.