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Smart man using a scanner for the actual temp. Assuming you're not losing coolant....2 things I'd look at here, 1st is you may have air in the system, make sure to purge all the air. 2nd is your fan clutch, I've replaced a few fan clutches in my own Trailblazer. Have had them bad right out of the box brand new. Have had bad brand new fan clutches on 2 of my last Trailblazers. You should hear it engaging especially in stop and go traffic.
Common problem you can send it to be repaired or get gauges and resolider in your self if you have the skills its on youtube video.we do repair s for this problem. the lamps should be re placed at same time but don't have if price is issue .
This is a pretty common issue for Trailblazers to have. Here's a link with more information about these GM gauge problems.
And where you can purchase replacement parts on Amazon if you want to do the repair yourself. Trailblazer Speedometer
First check the battery and its cable connections, second, try working the ignition switch several times. After that, you will need a mechanic to check it out.
Have the various systems scanned and see if they show a fault code, I suspect they will. As far as the gauges go that sounds like the rebuilder screwed up.
CHANGING SPARK PLUGS IN TRAIL BLAZER. YOU NEED TO REMOVE AIR INTAKE RESONATOR AND IGNITION COILS.YOU NEED LONG 3/8 EXTENSION - SPARK PLUG SOCKET - 3/8 RATCHET WRENCH. NEED SPARK PLUG GAUGE AND A TORQUE WRENCH.YOU CAN GET BY WITH OUT ONE LONG AS YOU DONT OVER TIGHTEN PLUGS AND STRIP OUT ALUMINUM THREADS.
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