Exterior Thermostat Issue - Ford Powerstroke Diesel Forum
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Old 01-15-2014, 08:35 AM
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Exterior Thermostat Issue

Wasn't sure where to post this but to me it would be more of an electrical issue. 2004 6.0 191XXX miles. The exterior thermometer up on top reads -40 all the time. It's obviously faulty and it was like that when I bought the truck. It's not a huge deal to me since I can check the temperature on my iPhone.. but it would be nice to get it working again. Anyone have any idea where I should even start? Or where the sensor is outside the truck so I can check that?
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Old 01-20-2014, 06:45 PM
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I'm having the same issue with mine. The sensor is up in front of the radiator behind the grill on the drivers side. I've already tried replacing mine with no luck. I would like to know. It's just rather annoying.


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Old 01-23-2014, 05:34 PM
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I believe -40 is the default value it shows when it's not plugged in or there is an existing short in the wiring. It is usually only a two wire connector that runs to the temp sensor. If you find the wires are chafed or cut just solder them back together. Since it works off resistance it won't matter which way you hook the wires back up with regard to pin location 1 or 2.

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