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Stock 1995 - 2001 Explorers Questions related to non-modified 1995-2001 Explorer, Mountaineer, Ranger and '02+ Sports and Sport Trac. Problem solving, maintenance, TSB, service bulletins, owner reviews, specifications.

Coolant Temp Gauge Not Working

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Old 12-12-2009, 04:41 PM   #1
DavidB82
 
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Question Coolant Temp Gauge Not Working

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 by DavidB82; 12-12-2009 at 09:27 PM.
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Old 12-16-2009, 11:23 AM   #2
DavidB82
 
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Nobody??
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Old 12-16-2009, 02:18 PM   #3
Kriegen
Montgomery, AL
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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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1999 Mercury Mountaineer 5.0L AWD Stock ~190K miles
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