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Testing coolant temp sensor?

Old Aug 29, 2016 | 05:41 PM
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Testing coolant temp sensor?

Aight, the coolant temp gauge in the truck doesn't register anything, and my assumption is that it's likely the sensor, but I wanted to see if anyone knew if I could test the sensor with a multimeter to make sure it's bad before I replace it? I checked the continuity and was getting something like 25 ohms if I recall correctly.

(I like to confirm things before replacing, learned my lesson about part throwing before).
 
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Old Aug 29, 2016 | 08:05 PM
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First, check the plug for VREF and see if there is between 4 & 5 vdc. If so, record OHMS on sensor at Room Temp, then immerse in 140*F water and check.
 
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Old Aug 30, 2016 | 06:43 PM
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Not sure what the normal readings are for that sensor as it is only used for the gauge and I have never had an issue with mine. However, they are quite cheap if you suspect it to be bad. Would not break the bank to just replace it.
 
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