Alex Young III

I have 2012 malibu v6 and im having some weird temperature issue. My gauge is doing some weird fluctuation. on a cold start its normal and its holding its temperature. I would drive the car for about 20-30 minutes in stop and go traffic and when i stop for like 4-5 minutes the temperature gauge goes to the half way mark then drops down to the mark under the halfway mark. Its usually stay on the mark under the halfway mark. Whats weird when i turn off the car and turn it on the on position it goes above the half way mark. I used a infrared thermometer when it was above and it showed about 200 F and i also have a scan tool and when the car was on the on position read around 230F. I took it to a mechanic and the did a pressure test on it and they said the pressure was good and i have no leaks as well. I had the thermostat changed but it was still doing the same thing but one mechanic said it was fine. I took it to another mechanic and showed him as well. I had some other work done to my car and whoever worked on my car last switched my coolant to green coolant instead of having it orange.they said i will need to get a flush and also a new thermostat. Anybody think that could be the case? Advice would be much appreciated because this is bugging me lol.

Cenobio Ramirez

Have you fix this problem? My 2010 malibu is doing the same