My dashboard temp gauge isn't working and it is causing me problems in this South TX heat. Any suggestions on how to troubleshoot this gauge would be very helpful. Location of sensors etc.

KJ

 

It could be the gauge, or the sending unit. The sending unit is located on the engine at the front, and has a wire coming from it. You can disconnect the wire (make sure it's the right one first), and with it disconnected, the gauge will either read cold or hot, and if you ground the wire to any part of the engine, the gauge will read the opposite. If the gauge doesn't move at all, then I would suspect it. Mine went bad two years ago.

 

To check the gauges with the key off:
Take the connector for the temperature sending unit off
put a cotter pin it, now attach it to a good ground,go back and turn the key to ON > If the gauge pins to the high side the gauge is good.



If the gauge DOESN'T pin, there is either something wrong with the gauge,wiring,or IC V reg.

To check the IC V.Reg with key ON:
Take a test light and attach it to the sending units wiring.
You should have a PULSING light.
If so, the IC V. reg is Okay.

If Not,either the wiring is bad or the V reg. is bad.
The IC V.reg is located on the back of the Instrument cluster.


So,If you have a gauge that Pins and a Connector that Pulse flashes : the problem is with the sending unit.

Check the S.U. for teflon tape wrapped around the threads.
If so,remove it and check it again for gauge reading.

Always use the proper sealant for sending unit threads.
Teflon tape is insulator
You need a conductor sealant.






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