Temp gauge & AC stop working and sometimes the oil gauge drops to zero.

2009 CHEVROLET BLAZER
83,000 MILES • 4.2L • 6 CYL • 2WD • AUTOMATIC
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SADAKA
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Hello,
I have a 2009 trailblazer, Temp gauge & AC stop working and sometimes the oil gauge drops to zero.Once technician RESET from comp or when i remove the battery cable in order to reset, it becomes ok but again same thing happens after few days.
Please help me to resolve this issue.
Oct 10, 2015 at 12:23 AM
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HMAC300
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it will have to be scanned for codes to see if it's a control problem in hvac or an a/c problem like freezing system up due to moisture in system. you may have a dash going bad or a body module causing the problem for the gauges.
Oct 10, 2015 at 6:15 AM
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SADAKA
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Thanks dear for your replying,

I do not think the problem is in the HVAC system, the AC stop working because the temperature drops to zero and as you know when the temperature of car is zero (cold engine) the AC does not work. so the problem of AC is clear that because the temperature become zero.
so my problem is why the temperature gauge drop to zero, and sometimes also the oil gauge, and after i reset the system by removing the cable of battery, the problem disappear and come back after driving for a few time...

Oct 10, 2015 at 2:23 PM
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HMAC300
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do what I said in first reply it needs to be scanned for codes. if the tech reset it then there was a code that he never told you or you decided not to fix
Oct 10, 2015 at 3:31 PM
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SADAKA
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Okay dear, I will do it today and will inform you what will happens.

Thanks a lot
Oct 10, 2015 at 10:47 PM
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SADAKA
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Hello,

I did the scan as you advised me, he found that the ECT sensor (energi coolant temperature sensor) should to change, i changed and next day the problem came back. :(

what now??!!!
Oct 14, 2015 at 10:33 PM
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HMAC300
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then you either have a short in the wiring or the cluster is bad and needs to be rebuilt.
Oct 15, 2015 at 5:56 AM
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SADAKA
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i changed the thermostat and till now it is okay, i wish the problem has solved.
i will inform you for any news.

Thanks
Oct 16, 2015 at 9:41 AM