Temp gauge slowly rises after warm-up with a/c on or off.
only way to lower is to switch heater to high and gauge returns to normal operating level and stays there.
similar problem 12-06 and dealer removed thermostat tested and cleaned and reinstalled and has been ok, until past few days.
car just went out of warranty on time, it has 34,900 miles on it.
there is no fluid on garage floor and coolant level is good and fluid appears normal.
Is the thermostat closing slightly after warm-up from build-up?
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If the radiator fans are working correctly, then sounds like a sticking thermostat. Only popping open when getting really hot. I would start with replace the thermostat.
Wait... This a 2011.. don't you have warranty still ?????? Take to dealer..
Why remove heat control valve? Bad idea.. Because of overheat? Put the defrost on and open the front windows to dump heat.
The thermostat controls the temp of the engine. The temp sensor tells the gauge what temp to display. If the heater is still putting out a lot of heat then it may be a false reading temp gauge. If however the temp is noticibly cooler then replace the thermostat. A stuck open thermostat would also cause the engine to warm up slowly. check for a loose/dirty connection at the plug on the temp sensor.
Try the overflow tank cap. The seal will go bad and not hold the psi causing the water to flow out this is something you will not always see which will cause the engine to overheat or temp gauge to rise. Also the thermostat could be sticking and cause the temp gauge to rise. Are the fans turning on when the temp gets high? If so then I would resort to the above first. If the fans are not coming on, the relay or fan/s could be the problem.
Check to make sure your thermostat works right by monitoring the warming up of your engine. With a completely cold engine, start and run the engine for a few minutes, then put your hand on the top radiator hose to monitor if and when it gets warm as the thermostat opens more and more and note the gauge reading( if it works) the top radiator hose should be unbearably hot within 5-8 minutes. If the therm. opens right it should close right aswell, staying open a little while eventhough the radiator may have cooled may be what you are experiencing causing the rapid cooling and is nothing to worry about. The Hose should not get warm very soon after starting the engine. Regarding you gauge, lets take one step at a time, verify proper op. or the therm.