Bad temp sending unit? Bad thermo? - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 12-02-2010
__Arod__'s Avatar
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Bad temp sending unit? Bad thermo?

Truck runs fine. Its cold out so im blasting the heat and thats working fine. But my gauge drops to C when its on. So I turn the heat off and it goes right back to normal. it never goes past normal reading temp. Im pretty sure its not a bad thermostat cause my heat would be wierd. Just wanted to know if maybe its one of the plugs on the thermostat housing

-2001 4.0
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Old 12-02-2010
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maybe the thermostat is stuck open, if you have a scan tool look at the temp readings. it could be a bad sending unit but i doubt it.
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Old 12-03-2010
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I would think if the stat is stuck open it would always run cold. Maybe the wrong stat? What temp stat is in there now. I had the same issue until I changed to a 195 stat.
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