I have been having a problem with the engine coolant gauge freezing at a value for a long time. All the other gauges will show changes pretty much as they happen but this damn coolant gauge is super slow and can be off as much as 20* due to its freezing. Has anyone else had this issue or any fixes? Thanks

 

Unplug and replug in your adapter.

If you're using a cheap one (like the $15 one), I wouldn't hold my breath. I have two of them and they both are quirky.