Check REAL temperature with a scanner. Likely it's your temperature sensor, which in your case, is located right above the thermostat. You're lucky, it changed locations in 2006 PIA, but 05 is easy.
Sounds like the sending unit.
That is where the wire plugs in for the temp gauge, on or near the thermostat housing.
SOURCE: Problem with No Heat on 2005 Chevy Avalanche - Cooling System?
it is most likey a sticking thermostat it either gets stuck closed or open in your case closed so collant isnt getting to the heater core and all you get is cold air blowing into the truck.
its a simple fix you can either do it your self or take it to a mechanic. now remember there are differnt thermostes so think about the climat you live in and get one according to that
SOURCE: 2005 GMC Sierra Overheating
If your sure there is no trapped air in system after refill and air bleed off, is fan clutch pulling good air thru radiator? Even if it is, the heater should have coolant as hot as what temp gage is showing! Try backwards flushing heater core (dex cool is notorious for plugging these up). There is a TSB for cracked cylinder heads from GM for unexplained coolant loss.Remove drivers side valve cover, and look at center three head bolts for coolant around them, if coolant has been getting in thru this suspect area, there will be a milky/pudding like goo under valve cover and on head. GM had a company called Castec cast these and the areas near the head bolts were found to be too porous (NO recall YET!) Ya, you guessed it, replace heads! Unfortunately, if its gotten hot to many times, it has probably hurt the heads/gaskets. Hope this helps. PS: The castec logo is under the rearmost pair of rocker arms,may have to remove them to see.
SOURCE: Engine Temperature Guage on Dashboard indicates overheating
Hi and welcome to FixYa,
Offhand, your described condition indicates a sticking thermostat, that is there is considerable delay before the thermostat opens. It is also possible that there is some restriction wherein the thermostat is not opening completely when the triggering temperature has been reached. As a test and to confirm, you could try temporarily removing the thermostat and operate the engine without one; observe temperature. The side effect of this test is that it would take some time to warm-up the engine, but operationally should not cause anything untoward. Of course, care has to be exercised that the gasket would still be intact.
Good luck and thank you for using FixYa.
SOURCE: temp. gauge reads high some times. but the motor really isnt hot
It sounds like the coolant temperature sensor is beginning to fail. It is highly unlikely that the in-dash gauge is a problem. The coolant temp sensor inputs to the computer affecting everything from radiator fan speed, engine fuel/air calibration and a variety of other parameters.
Be absolutely certain to "burp" every bubble of atmosphere from the coolant system too. Air bubbles have the amazing ability to prevent coolant flow and will cause all sorts of problems, especially if the bubble wants to hang around the temperature sensor location.
Normal operating temperature is going to be around 210 F.
Most Autozone, Advance locations will read engine problem codes at no charge, so drop by one of those locations and let them read the problem code.
My guess will be the coolant temperature sensor. Then have the problem code reset, remove all air from the coolant and let us know how this worked.
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