2000 Ford Explorer Temperature Gauge Not Working

Tiny
C22MUNSEY
  • MEMBER
  • 2000 FORD EXPLORER
  • 6 CYL
  • 2WD
  • MANUAL
  • 76,000 MILES
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.
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Tuesday, July 6th, 2010 AT 1:57 PM

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Tiny
CARADIODOC
  • EXPERT
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
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Tuesday, July 6th, 2010 AT 2:15 PM
Tiny
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?
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Tuesday, July 6th, 2010 AT 3:06 PM
Tiny
CARADIODOC
  • EXPERT
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
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Wednesday, July 7th, 2010 AT 12:34 AM
Tiny
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
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Wednesday, July 7th, 2010 AT 12:37 AM
Tiny
C22MUNSEY
  • MEMBER
But how do I ground it? Just touch it to some metal or something?
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Wednesday, July 7th, 2010 AT 7:28 AM
Tiny
CARADIODOC
  • EXPERT
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
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Wednesday, July 7th, 2010 AT 12:13 PM

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