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New Holland Skidsteer Forum
Coolant temp light/ alarm going off
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<blockquote data-quote="Topper1" data-source="post: 132718" data-attributes="member: 22814"><p>Engine is NOT actually overheating??? Not a simple thermostat stuck closed???</p><p>If that isn't the case, I'd strongly suspect a bad sensor or grounded sensor wire.</p><p>***Sensor is a linear resistance curve 4300-180 ohms, decreasing with temperature rise.</p><p>"overheat warning" usually occurs at around the 80-100 ohm value. ***</p><p>Sensor testing</p><p> - Disconnect sensor wire.</p><p> - Sensor pin to ground (60*F +/- 4300 ohms, 212*F +/- 180 ohms)</p><p>**** At running temp, if sensor reads less then 80 ohms, it has most likely failed****</p><p> - wire to ground should have +/- 12volts to ground while disconnected from sensor, key on.</p><p> -possibly got water into the sensor itself, Unlikely, but have had it happen to myself on a couple of occasions.</p><p></p><p>If you were aggressively washing inside the cab, you may have gotten the control panel wet.</p><p>I do wash my interiors carefully on occasion, but have never had a failure of the control panel.</p><p>***We are all extremely careful NOT to blast our interior electronics with washguns I would hope.</p></blockquote><p></p>
[QUOTE="Topper1, post: 132718, member: 22814"] Engine is NOT actually overheating??? Not a simple thermostat stuck closed??? If that isn't the case, I'd strongly suspect a bad sensor or grounded sensor wire. ***Sensor is a linear resistance curve 4300-180 ohms, decreasing with temperature rise. "overheat warning" usually occurs at around the 80-100 ohm value. *** Sensor testing - Disconnect sensor wire. - Sensor pin to ground (60*F +/- 4300 ohms, 212*F +/- 180 ohms) **** At running temp, if sensor reads less then 80 ohms, it has most likely failed**** - wire to ground should have +/- 12volts to ground while disconnected from sensor, key on. -possibly got water into the sensor itself, Unlikely, but have had it happen to myself on a couple of occasions. If you were aggressively washing inside the cab, you may have gotten the control panel wet. I do wash my interiors carefully on occasion, but have never had a failure of the control panel. ***We are all extremely careful NOT to blast our interior electronics with washguns I would hope. [/QUOTE]
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New Holland Skidsteer Forum
Coolant temp light/ alarm going off
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