This is common, and the solution is usually pretty simple. Check out the information at the following link: http://www.tundrasolutions.com/forums/hi...
The first time I had problems with my 2002 I was able to get it working again by just tighting the nut behind the temp knob, but that was a temp soulution as it lasted only about 3 months, I then pulled the unit and replaced the little broken wire, the sytem is still working great 1 year later.
dwh
Source: http://www.tundrasolutions.com/forums/hi...
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