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I suspect the TDM is the culprit once again since I tested the temp switch using the hot water method and it's serviceable. However, there's some good electrical circuit tests illustrated in the 'Component Testing and Troubleshooting' leaflet (5715434) that cover all of these components and...

Well, it happened. My truck has finally made up its mind and the fan has now defaulted to the full-time 'on' position. Since I've now lost a good chunk of my horsepower I'm motivated to begin troubleshooting the culprit. lol

Yes, the fan comes on when I unplug the TDM as it should. The system is designed to default 'on' if there's a problem to prevent overheating, but for whatever reason my system believes it's working properly even though the fan does not come on when it should. Obviously the Cadillac valve is...

I've recently begun to experience the same problem as well. I tested the temp sensor using the hot water method and it works as it should. I then swapped the TDM with another one I had, but that didn't solve the issue either. At this point out of process of elimination I believe the Cadillac...