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How to check Engine coolant temperature sensor; coolant temperature sensor
Topic Started: Sep 18 2011, 01:20 PM (2,467 Views)
vikasintl
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Is there any way we can check coolant temperature sensor ..in 96 geo metro which has 3 terminals

that means temp. gauge sending wire is also included in this sensor..
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Memphis metro


You can measure resistance of the sensor at differant temps and if its not within range, replace the sensor.
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vikasintl
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enginedoctorgeo
Sep 18 2011, 01:27 PM
You can measure resistance of the sensor at differant temps and if its not within range, replace the sensor.
Thanks, I could not wait and replaced sensor...
New ones are costly..about $40 so, actually I found 2002 Suzuki esteem in local junkyard and grab its sensor and put in my 96 geo metro...I found O'reilly website that its compatible...

I took a test drive...it did go to operating temperature..and gauge stays in the middle like it was before...its runs ok for now..but my original reason to replace this sensor is...to expect better fuel economy..currently car runs fine..no issues but MPG is only about 32...so Johnny suggested me to replace it...

But I will also check resistance at different temps..could you please give me range so I can compare?
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Memphis metro


210f -- 190ohms
160 -- 400
100 -- 1250
70 -- 2350
39 -- 4780
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