91 Chevy 5.7 temp gauge not working

smurfcivic · Aug 11, 2018

Can’t figure out my temp gauge issue. Seeing if ya can help me out. I’ve replaced the temp sensor on the driver side, grounded out green wire for sensor and the gauge went to hot. I’ve even checked polarity from sensor to back of gauge cluster. And gauge still doesn’t go over 100. I installed a mechanical gauge to make sure engine is warming up correctly and it works perfectly normal. It’s just the factory temp gauge will not work. Does it get power from another source?

Jared Jackson · Aug 11, 2018

That's crazy, I was just posting about this today in the "What did you do to you GMT400 today?" thread... Mine never reads over 150-160. Pulled some data from the ECM and the OTHER sensor is reporting 194ish for the temp, so I know it's hott!

I grounded out the one wire sensor and the gauge pegged over hard, so I know the gauge is physically working.

Someone posted what the resistance should be to display certain temps on the gauge. I have a buddy who is going to wire up some resistors and a switch to test both and see if my gauge displays the correct temp for a specific OHM. I was going to post up those results and see if the gauge ******* is not a perfect test for the accuracy of a reading.

smurfcivic · Aug 12, 2018

I’m thinking the gauge gets power from ignition. About to dig into it

Jared Jackson · Aug 12, 2018

smurfcivic said:
I’m thinking the gauge gets power from ignition. About to dig into it

But the gauge pegged over when you grounded it right? Sounds like it is getting power...

smurfcivic · Aug 12, 2018

Yep. That’s why it doesn’t make sense to why it doesn’t work. Done replaced temp sensor multiple times to

smurfcivic · Aug 12, 2018

Swapped out stepper motor from another cluster and fixed my problem. Guess I answered my own question again lol

Jared Jackson · Aug 12, 2018

Maybe I need to look into that

Jared Jackson · Aug 14, 2018

smurfcivic said:
Swapped out stepper motor from another cluster and fixed my problem. Guess I answered my own question again lol

Did you pick up a cluster out of a salvage yard and swap it over directly? I was just starting to look into this...

smurfcivic · Aug 17, 2018

I just removed the stepper motor out of other cluster cause I couldn’t find one the same as mine with the tach

smurfcivic · Aug 17, 2018

Here’s my gauges

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91 Chevy 5.7 temp gauge not working

smurfcivic

I'm Awesome

Jared Jackson

I'm Awesome

smurfcivic

I'm Awesome

Jared Jackson

I'm Awesome

smurfcivic

I'm Awesome

smurfcivic

I'm Awesome

Jared Jackson

I'm Awesome

Jared Jackson

I'm Awesome

smurfcivic

I'm Awesome

smurfcivic

I'm Awesome

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