Make sure that the coolant is full. Check for a stuck thermostat or non functioning water pump. These are the most likely causes.
If you temperature gauge is going up and down then you may have a problem with your sensor. You should take your car to a professional to ensure that you don't overheat your car.
The outside temperature may be stuck on your Chevy Trailblazer because the thermometer may not be working properly. You can buy a new part from the manufacturer, but depending on the year, it could be expensive.
A gauge glass may burst depending on the gauge itself. High temperature and pressure situations may cause the glass to burst.
There are a few different reasons why your temperature gauge always shows that the temperature is low. It may need to be fixed.
Inside or outside? I think you may have more issues than you may think. Visit our enthusiasts forum and get to the bottom of the problem with help from other Trailblazer owners! www.trailvoy.com
Say now, it is possible to dismantle the instrument cluster, and replace the gauge unit itself. Keep in mind that the price of a new one from a dealer may be steep! To put a mechanical gauge in may require drilling a hole in the firewall. Also, the computer may need to monitor the water temperature in order to function properly. If the temperature gauge is not reading, then I would suggest going to a parts store, such as Auto Zone, and getting an aftermarket temperature guage and hooking it up because there is no way to replace the factory gauge.
The outside temperature gauge says ICE this morning (AM) because it may be icy outside. Also, the temperature outside may be below 32 degrees, which is freezing temperatures.
Could be temperature sensor Could be gauge
that is rather unusual i would ask the dealership you brought it from and ask them and then go from there. Some vehicles have two temp sending units, one for the temp gauge and one for the ecm. The one for the gauge generally has one wire going to it, the one for the ecm may have two wires going to it.
It may be the fuel sensor going bad. I had an '05 with only 40k miles, and the fuel gauge wouldn't come off of E. They had to replace the fuel sensor and it went back to working normally. Not a particularly cheap repair since the gas tank must be removed to get to the sensor.
It sounds like your temperature sender (on top of the engine) is faulty allowing it to earth out, or the wire going to the sender may be touching a earth.
Mine was a bad ground on the gauge. Easy check by any certified mechanic.