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Old 07-23-2017, 05:56 PM   #71
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Old 12-26-2018, 10:31 AM   #72
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Bumping an old thread for a serious problem fix.

I am going through similar issues with a 1993 Gillig with a Cummins c8.3. In those years they used a dual temp switch to control the solenoid that feeds the hydraulic fan motor. Mine had failed before for the previous owner so I had an idea of where to start looking.

It installs into a short manifold on the back end of the engine and swaps out easily. The previous owner had a manual electrical switch installed that put the fan into high speed. As long as it was on the engine ran cool. Way too cool actually. And I'm sure it cost me a lot of fuel, as well, by running on high constantly. We go no real dash heat either.

I changed the dual temp switch yesterday and it worked perfectly. I could watch it cycle about 10 degrees as I drove.

Hope this helps someone out there. Joe

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