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No coolant temp reading and the thermostat was changed

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Old 10-20-2017, 04:27 PM
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No coolant temp reading and the thermostat was changed
About a month ago,I noticed the coolant temp gauge was down to zero. It did come back on the next time I started the car.
After reading up in this forum,I changed the thermostat. Problem solved. Until today,3 weeks later...the check engine light comes on...
and the gauge is zero,AGAIN...Drove it around all day,and stayed at zero.

So,is it a bad thermostat (which was brand new btw) or the sensor?
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Old 10-20-2017, 04:31 PM
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Did you use the ACDelco 131-158 GM P/N 12622410 ?
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Old 10-20-2017, 05:22 PM
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X2, anything but and this happens!
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Old 10-20-2017, 05:31 PM
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X3 plus what code number did it show this time ?
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Old 10-20-2017, 06:05 PM
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Originally Posted by RJ_RS_SS_350
Did you use the ACDelco 131-158 GM P/N 12622410 ?
No,one from Pep Boys.
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Old 10-20-2017, 06:06 PM
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Originally Posted by Oldblue
X2, anything but and this happens!
So that means ANY aftermarket t-stat except ACDelco won't work?
Kinda pisses me off...
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Old 10-20-2017, 06:07 PM
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Let me add when I took the old one off,the old gasket was fine,not deteriorated. I used the new one anyway.
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Old 10-20-2017, 06:33 PM
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Hmmm. The other 2 helpers got replies. I ask about the all important code number and get no response.
Hope you figure it out. I'm done.
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Old 10-20-2017, 06:51 PM
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It’s been mentioned many times here, the aftermarket t-stats do not open in the time frame the computer is calibrated for , the the code gets thrown. Most likely P0128.
And only use Dexcool 50/50 mix, these Ecotec engines were engineered for it.
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Old 10-20-2017, 07:03 PM
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Originally Posted by firemangeorge
Hmmm. The other 2 helpers got replies. I ask about the all important code number and get no response.
Hope you figure it out. I'm done.
The paperwork from Autozone with the code is out in the car,which is NOT home right now,so I couldn't reply.
Jeez,NO patience.
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