Originally Posted by Pclem
no, i used a failsafe from autozone, that way if it does fail it will fail open
We sure do replace a bunch of the fail safe thermostats in otherwise normally functioning cooling systems. Might be wise to do some research on those thermostats and you might find that they cause more trouble than their worth!
Did the thermostat you installed have the "jiggle" valves? They say they have a "bleed notch" but they just don't work well. Often cause drastic temperature swings. If I were in your shoes I'd order a cummins thermostat and see if that fixed my problem.
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