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Coolant Temp Gauge Not Working

Discussion in 'Stock 1995 - 2001 Explorers' started by DavidB82, December 12, 2009.

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    1. DavidB82

      DavidB82 New Member

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      Hello, I'm helping a friend fix their 2000 Explorer 4.0L OHV. The problem is that the temperature gauge sits below "C" whether or not the engine is warmed up. So, I searched around on this site and found the location of the Temp Sender (the sensor in near the thermostat with one 1 wire). I did the test of grounding the wire to see if the gauge works and it does. Straight to ground puts it pegged above "H" and putting a 100 ohm resistor in line puts the gauge somewhere in the middle.

      So, I figured it must be the sender. I got a new one and put it in. Unfortunately, the needle still sits below "C". I let it warm up some to where the radiator hose was warm and the needle still hadn't moved.

      I tested the resistance through the temp sender connector prong to the brass body and got about 2500 ohms. Given that 100 ohms put the needle in the middle I was wondering if the new temp sender might be bad? Does anyone have a chart/table of the resistance of the temp sender resistance vs temp?

      If anyone has any other ideas I'm all ears.

      Thanks,
      David
       
      Last edited: December 12, 2009
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    3. DavidB82

      DavidB82 New Member

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    4. Kriegen

      Kriegen Active Member

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      City, State:
      Montgomery, AL
      Year and Model:
      1999 Mounty 5.0L AWD
      how warm does the heater blow if you turn it all the way up? The issue could be a thermostat that is stuck open. My mountie had a similar problem, the temp gauge seldom went above C and my heater never blew more than slightly warm air. Replaced the thermostat and now the gauge goes to where it should and I get nice hot air.
       

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