This afternoon driving on the highway my engine coolant temp gauge started beeping at me. First time I ever seen the temp in the hi range. I immediately pulled over and popped the hood to check coolant levels. All were fine! Looked for leaks, nope. Looked at fan to make sure it was spinning, yup. Got back in the car and the temp had gone back to its normal reading. I hadn't shut off the engine while checking these things....Started driving again and the temp indicator started going up again!! This time I got off the highway and pulled into a parking lot. Engine is still running. Still no signs of leakage or anything abnormal. Check the temp gauge ad it's back to normal!!!
As I started driving towards home I decided to shut off the AC. The temp gauge stays in its normal range for the next 50 miles. As soon as I turn on the AC, within a few minutes, the temp goes back up. Shut the AC, it goes down!!
What in the AC cause the engine temp to go up? Car has 167K on it. 4.6L V8
-TheKidd