Temp gauge fluctuation

[shelbymann]

On my 2019 2.0 Redline Equinox I have had my temp gauge fluctuate a few times in the last month when really cold out. The normal position is "10 o'clock" but sometimes when it warms up it goes beyond that to the 12 o'clock position then comes back down and settles at the 10 o'clock or for a better term if it was a gas gauge it would be at the 3/8s marker. I have 137K on it and am ready to change the anti freeze out. Has anyone else have this issue and waht did it turn out to be. The thermostat? Thanks in advance

 

[RIT333]

Sounds to me like you should change the there while you are doing the coolant.

 

[ricklack]

I would agree to change the thermostat. Most likely cause and cheap to fix.