Originally Posted by Caicaraskiki

I have the exact same problem with a 2001 Montero Ltd. I had the transmission replaced, and after getting it back I noticed the overheating issue. The gauge immediately jump to the top, and I verified the vehicle was not overheating. It was scary to drive in this fashion, but I was convinced the problem was electrical, and that nothing mechanical was causing anything to overheat.

I returned to the AAMCO dealer and demanded that he fix whatever damage he caused. Of course, he denied any wrongdoing, checked his computer, and suggested that I replace a sensor. However, the computer identified more than one is a possibility. He stated they had nothing to do with his repair, and I was not in a position to prove otherwise. I paid for the replacement of the sensor, drove away, and within a block the temperature gauge was back up at the very top showing overheating. I immediately returned, whereupon he suggested the other sensor identified earlier may be the one causing the problem. I told him I wanted him to replace it for free since he sold me a sensor that had nothing to do with the problem. He refused any credit, and defended his action by saying his computer told him the replaced sensor was bad. Total horse crap. Again, I was in no position to prove anything. He wanted to keep on charging me for every harebrained idea that occurred to them. I told him to shove it. I elected to continue driving the car, which I have done without issue for over a year.

The problem I have today concerns passing an admissions test in Arizona. The car passed the test, but they flunked me anyway because the "check engine" light remains on. They agreed it otherwise passed. They also checked "catalytic converter," according to my wife, who has the car in another city.

I told her to take the car to an AutoZone and have it checked out for free. She did, and reported back that they checked off three possible problems, the catalytic converter, and two other sensors.

I reviewed all for him responses on this subject, and reviewed other posts online, and it appears there is really no fixing the temperature gauge issue, apart from buying a new car. Has anyone successfully made the repair? The posts here were made earlier, and I am just wondering if there is a happy ending? I do not wish to spend a lot of money down the toilet. Any ideas on the repair of the catalytic converter? All responses greatly appreciated.