2000 Ford Explorer Temperature Gauge Not Working

2000 FORD EXPLORER
76,000 MILES • 6 CYL • 2WD • MANUAL
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C22MUNSEY
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I recently bought this vehicle from Virginia and on the way home the temperature gauge was running very cold. It has since stopped working altogether. I have replaced the thermostat, the single wire temperature sending unit, the double wire temperature control sensor (same part number for both the single and the double wire according to Napa). I have grounded the wire and the gauge went up to the normal operating temperature. All of the fuses are also good on the car.
Jul 6, 2010 at 1:57 PM
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CARADIODOC
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Hi c22munsey. Welcome to the forum. Good test grounding the wire, but do you really mean the gauge went to "normal" or did it go all the way to the top? If it only went to the normal range, there is excessive resistance in that wire or the gauge isn't working properly. It should have gone to maximum.

Do you have access to a scanner that will read live sensor data? That will show what the Engine Computer is seeing from its coolant temperature sensor. If it is also low, try pinching the upper radiator hose to slow coolant flow through the radiator. If that brings the temperature up to normal, look for coolant bypassing the thermostat.

There are a lot of people here who would be happy to trade places with you. Lots of overheating issues, very few too cold concerns. :)

caradiodoc
Jul 6, 2010 at 2:15 PM
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C22MUNSEY
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My grandfather actually did the grounding so I'm not sure what the dash read. Is there a quick way that I can ground it right now to check?
Jul 6, 2010 at 3:06 PM
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CARADIODOC
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Yup. Unplug the wire for the dash gauge and ground it, then see what the gauge reads. It should go to full hot. I'm not sure what "normal" means from your original post. Normal, as in where the gauge should be running during normal engine operation, or normal to be reading full hot when the wire is grounded.

caradiodoc
Jul 7, 2010 at 12:34 AM
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CARADIODOC
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I'll be out of town from Wednesday through Sunday night at the nation's second largest old car show swap meet at Iola, WI. Will check replies as soon as I get home.

caradiodoc
Jul 7, 2010 at 12:37 AM
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C22MUNSEY
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But how do I ground it? Just touch it to some metal or something?
Jul 7, 2010 at 7:28 AM
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CARADIODOC
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Yup. Unplug it and if necessary, use a cotter, paper clip, or piece of scrap wire to connect the terminal to the engine. I use a clip lead so it will stay grounded while I trot around to look in the car. Don't need a helper that way.

caradiodoc
Jul 7, 2010 at 12:13 PM