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Old 07-28-2014, 09:17 PM
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ENGINE temp gauge dies and tow haul flashes

I've read several threads about the tranny temp gauge either pegging hot or bottoming out to cold and the tow haul light flashing w/ check gauges popping on and the universal consensus seems to be the tranny temp sensor.

Today I developed a similar problem on the ride home after changing the A/C evaporator core on my 04 F250. However, my tranny temp gauge remained even. It was my engine temp gauge that bottomed out. Same check gauges light, same hard shift that I've read about here, but the engine gauge. Trouble is, in a 4 mile stretch of road, it happened 3 times. The gauge would peg, the light would flash and CG light came on then a minute later, everything went back to normal. A mile or so later, it happens again.

Is it possible that I bumped some wiring connection loose when I was fooling around the evaporator core housing?
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Old 07-29-2014, 02:46 PM
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Update in case someone else has a similar issue. I drove it this morning and had the temp gauge come up and die several times in a 5 mile run. When the gauge would die, the tow haul light came on, tranny kicked down and rpms went up. A minute or two later, the dummy gauge would go back to normal and all was right again until it happened again. When I got to the shop, I let it idle and noticed a slight bounce in the temp needle.

Killed the engine and started searching connections. I finally found two chaffed and touching wires going to the engine temp sensor on the thermostat housing. Repaired those good with tape, disconnected the battery to reset the CEL and so far (knock on wood... it IS a 6.0 afterall) the problem seems to be fixed.
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Old 09-13-2014, 06:12 AM
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i have a 2005 f350 6.0. the tow haul light started flashing then the engine light came on. the trans temp gauge goes from normal to cold (back and forth) . i had the temp sensor replaced yesterday and its started doing same thing again today (not towing anything) any suggestions or ideas??
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Old 09-13-2014, 12:58 PM
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I'd look for a chaffed wire or bad connection somewhere. My chaffed wire issue caused all sorts of other problems. My air conditioner compressor would get in a bind or quit engaging, the temp gauge would fluctuate up or down, and my tranny would hard shift or go into limp mode whenever the tow-haul light started flashing. Once I found the chaffed wire, my issues were resolved.
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