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Questions and Answers

Ford Explorer Temperature Gauge

Q. 1991 Ford Explorer. My in dash temperature gauge is not registering at all, and after driving for 10 to 15 minutes my check engine light comes on. Can you help?


A. This is an interesting question in that there are two coolant temp sensors, one for the gauge and one for the EFI system and they don't have the same connectors so they can't be plugged in backwards. And I don't think both went bad at the same time.

It's very possible you have two separate problems here. To check the dash sending unit, turn the key on and unplug the single wire connector at the temp sending unit and ground it. If the gauge goes to full hot, then the sender is bad. If not, then the problem is in the gauge itself or the wiring. 99 times out of 100 it's the sending unit.

As for the check engine light, you'll have to pull the codes out of the PCM and see what they tell you. Then you can go from there.

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