Heading out of Phoenix, I settled in at approx 90-100 mph... A/C on, ambient temp 108.
Approximately 20 minutes later I'm running 100-110 and notice my temp gauge is higher than 3:00 position.... About 2:30 or so...
I immediately shut off the A/C, roll down the windows, but maintain speed. It takes 10 minutes to return to normal 3;00 position.
I stop for lunch and check the gauge after 2 minutes of shutdown (to ensure against a "hot soak" condition) - it's cooling down nicely. Check the coolant overflow tank, all is normal...
Back on the road. A/C on, 100 mph, temp again gets to the 2:30 position. Shut off A/C, run the rest of the way into Tucson without it.
RETURNING from Tucson, I maintain 100 mph (some sprints to 110, some lulls to 90) with A/C on, temp never reaches past the 3:00 mark. Same ambient temp, nothing's changed...
Need some advice from Dennis / Scott / other pros - What's the first thing i should check? Recent coolant flush, 50/50 mix (damn dealer's idea), all new belts / hoses...
New radiator necessary?
