My SP1 is overheating. Getting up to 240F on the freeway under light throttle, used to settle down around 202F up until about 2 weeks ago. The right side radiator is really hot. The left side radiator is cold. The fan will come on for a few minutes if I sit still at those temps, but temp only goes down to about 236F. I assume that the thermostat is not opening and preventing flow through the cooling system. I don't think the water pump is at fault because the temps should be the same, if that was the case. How difficult is it to get to the thermostat? Does the throttle body have to come off? Any other thoughts?