Temperature light always on

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Ruebels

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Hi all

I am a complete newbie, so please bare with me.

I have a 71 convertible with a base 302.

My issue is my temperature light stays on, even a cold engine that I just started. I replaced the temperature sensor but the problem persists. 

I'm told that it might be a short to ground, but I haven't the first clue how to remedy that.

Any help you could offer would be appreciated.

Btw, the sensor I bought from Autozone is a Duralast TU25

Thanks in advance 

 
The "sensor" for the base gauge package with the warning light is simply a switch. When the engine gets to "X" temperature, the switch provides a path to ground, illuminating the light.  If you pull the connector off and the light goes out, you have either a bad or incorrect sensor. When you ground the connector to the intake, it should come back on. 

TU25 is a Wells number, and is for cars with gauges, not the warning light. Autozone doesn't show a sender for the light. 

https://www.napaonline.com/en/search?q=Nty%3D1%26N%3D2500015%2B2601504%2B2802227%2B10197100%2B5002600%2B200260260%26Score%3D1&referer=plp&partTypeName=Temperature Sender Switch&keywordInput=temperature sender&scene=partTypesScene1&fullyQualified=true&isBackButtonEnabled=true

https://www.rockauto.com/en/catalog/ford,1971,mustang,5.0l+302cid+v8,1132670,cooling+system,temperature+sender+/+sensor,4748

 
Last edited by a moderator:
Thanks for the reply. I didn't even think of that but it makes perfect sense, and is par for the course with me, lol.

Just ordered the light type sensor from Napa and will pick it up after work.

Fingers crossed that it is such a simple fix.

I'll let you know

 
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