Today I had a temp spike and the car went into limp mode. I pulled over shut off the car and opened the hood, everything looked fine. I restarted the car, turned off the AC, and turned on the heat with the fan on max (the windows down - temps today in the mid 90's). Was able to get the temps down below 220, the light went off, and the car was no longer in limp mode. Was able to drive home but a few miles from the house I turned the AC back on and the temps went back up. This is really strange. I've got 37,000 miles on the car with out any problems. I've been driving all summer with no problems and the AC on. Highest temps I've seen before today while pushing the car with the AC on was 235. WTF.