Hi again,

A overheating problem usually makes boiling and grumbling sounds after the engine is shut down.
If you haven’t heard that, then you are not overheating and it just might be the board sensing a signal that it’s just a little bit warmer.

The chip in the board moving in digital steps.
The circuit board does not know how to make smaller steps so it takes the next big up one!
It can move 1/4 of the range up that would be only the width of the needle normally!
This move is a bunch up and it scares or alarms people.

If it’s hotter and they know it hotter than usual outside, it stands to reason to pop eyebrows!
Interesting enough, This can happen even when it’s cooler outside.
Since you know that it’s cooler on the engine at the moment, you are curious, as too, what caused this and you say, “What the heck and go with weird!” (:-)

This is the to get rid of that thing and go with strictly analog. It will do this without it altogether.

I read that Volvo had earlier complaints with the gauge moving some when the engine was climbing hills or the introduction of more air conditioning units being demanded or sold.
This rattled some people into making “service” complaints.
This was suppose to be their fix this for those few that “expected” their cars to be a “State of an Art, invulnerable machines!”
These types are also within the BMW dreamers and Porsche fanatics crowd at heart!
More $$$$$ than other things!
Volvo has tried swooning those characters!
The newer cars are space capsules with wannabe astronauts for buyers!
It took awhile, but Volvo has gravitated to staying mainstream, for better or worse?

For me, an installation of a newer radio leaves my eyes glazing over! I read the manual to see so many features I have absolutely no need for!
Especially for another enhancement subscription for this or that service associated with a peripheral device!

Sorry, I don’t live in my cars, as of yet!
(:)

Phil