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temp sensor troubleshooting

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gelsby

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Just installed a rebuilt engine in my 95 seadoo gtx. It runs great. But I want to make sure the temp sensor works so I know if it the engine ever overheats.

I replaced the buzzer already and it works when I ground the sensor wire to the grounding post with the engine running so I know the wiring and buzzer are good. But I am worried about the sensor as I have read they often go bad.

I put the bottom of the sensor in water and heated it to boiling. I held on to it with visegrips . my multimeter showed 1 before during and after. I put one end on the tip and the other lead on the threads.

Because the reading never changed I assume it is bad. The tip of the sensor got wet, should that matter?

I don't want to waste $75 if I am doing the test wrong and the sensor actually is good.

All the posts talk about sensors that go off when there is no overheat. Anybody hear of a sensor that does not work when the engine is overheating?
 
Your test appears valid, but I would think that with a 1 ohm reading you would get an overtemp alarm as soon as you connect the wire.

Ohms should go to approx zero at a temperature just under boiling, else should read open.

Temperature sensors and thermostats can fail in either mode: activate when they shouldn't, do not activate when they should.
[MENTION=41828]Minnetonka4me[/MENTION] (hopefully I spelled that right) probably can help you out with a better price on a used sensor.
 
I agree with Ron, Replace it! Its too internally corroded to move to close the electrical circuit.
 
do NOT spend $75 !!!!!

good lord between the members here I bet we have 150 old temp sensors laying around somewhere, I bet I have 10 of them.
 
do NOT spend $75 !!!!!

good lord between the members here I bet we have 150 old temp sensors laying around somewhere, I bet I have 10 of them.

+1 lots available from members here.

Usually its the opposit and they don't short out when you need them to!
Good catch!
 
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