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-No not to worry about it if your car never over head.
-No you can't get any reading if the temperature is at your thermostat's setting or below.
-It connect or (Works) ONLY when the temperature at that area reach above the thermostat setting or up to 200 degree or higher.
Your car has a temperature senser and as soon as the temperature is above a certain level the engine fails as a way of safety. its a safety control switch . First start the engine when it is cool and then check the performance of the fan. Is the generating enough air to cool the engine.as it is running check the temperature gauge i the car and see the level . It could be the fan not providing enough air cool the engine.
The temperature display on the rear view mirror my 2002 Trailblazer LT is either way incorrect - like obviously too high or too low - but mostly just shows "OC" all the time. Is this an expensive fix? Is this an easy fix that I could do myself? What do I need to replace and how
The first thing that I would check would be the resistance of the engine coolant temperature sensor, This is the sensor that tells the computer how hot the engine is and allows the fan to kick on when the temperature reaches a certain threshold.
I also recently bought a 2002. According to the owner's manual the blue light does not indicate a problem unless it stays on after the car warms up. If you have an automatic it will not shift into fourth gear until the coolant warms up at which time the light should go off. Have only had the car for a week and notice the blue light goes off after a mile or two of driving in temperatures in the teens to 30's. I don't know how much outside temp affects it.
this is caused by a internal fault in the display and a very common issue with this dash and many ther GM cars from 86-90's, u can buy a rebuilt dash or have yours repaired, I have a number u can call and talk about your problem and get it repaired if u so desire
Toll free Number 1-888-803-8523 if you have any questions or to make shipping arrangements