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Old Jun 20th, 13, 09:16 PM   #1 (permalink)
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Join Date: Dec 2007
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Temperature gauge not working.

The temp gauge on my wife's 93 Z28 LT 1 is not working. Car runs fine. No over heating.
What do I check. How do I check.
If the gauge is not working will that affect the electric fans at all

Kinda new at this need help

Thanks in advance.

Al
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Old Jun 21st, 13, 03:29 AM   #2 (permalink)
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Re: Temperature gauge not working.

I believe the temp sensor is a three-wire type.
One terminal for the gauge, and the other pair for the PCM.

You could measure the resistance across the two PCM terminals and hopefully read a high resistance when cold and lower resistance as the engine gets warmer.
The remaining terminal is for the gauge and resistance would be across the terminal and sensor body/engine block/ground. Same action here, cold, high resistance, warmer temperature, less resistance. No action happening with either circuit, new sensor needed.

You could unplug the connector and jumper in a 0-1K potentimeter/variable resistor to the gauge lead and ground, ign on, and vary the resistance and view the gauge for sweeping action. if gauge works, new sensor needed. If gauge does not work, bad gauge or connection from the sensor to the gauge or loss of power to the gauge.

However, if the engine fast idles when cold, then slows down after warm-up, it is a good bet the fans would come on as the PCM still works.
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Old Jun 21st, 13, 01:49 PM   #3 (permalink)
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Re: Temperature gauge not working.

Thanks for that. Electrical is not my thing. But I get the just of what you are saying.
I can say upon start up the engine does fast idle then goes down after warm up.

So if it is the temp sending unit. Do I need to be concerned removing it from the head it being aluminum. The car has 62,000 kilometres on it but the part he's been in there 20 years.

Thanks
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Old Jun 21st, 13, 02:48 PM   #4 (permalink)
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Re: Temperature gauge not working.

Have a new sensor in hand. Sensor should/might have sealer on the threads.
Optional to apply one lap of Teflon tape to threads.
Engine cold, remove the sensor in one hand, and quickly replace with the other hand.
The faster, the less coolant lost.

The reason for the optional thread tape is the sensor body should have a good contact with engine head/ground to have a complete circuit for the gauge.
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