So we can add my wife's 1980 244 to those on this forum who have rodent issues in their Volvos. After reading all the postings here I can say that in our case:

(a) Peppermint doesn't work.
(b) Drier sheets do not work.
(c) Cat urine does not work (and smells awful).

What does seem to work are glue traps off Amazon baited with a tasty morsel of peanut butter dabbed in the middle. I stick them down in the trunk with a loop of packing tape underneath to hold it in place.

But just when we think we have things under control, mice show up again.

I am sure there are numerous ways for mice to gain entrance - especially on an old vehicle. But I have read that the air intake is often a source they use on these cars.

But I am sad to say that I am not sure where the air intake even is located. I have pulled the cover off the air cleaner and it is intact. And I figure that is only air for the engine anyhow. There is a flip-lever air vent by the driver's knee but I don't think that has been open at all this past winter while the mice first became an issue for us.

I see the air vents near the front/rear windshields. But I see no way they could get through there. Is there some other air intake I am not seeing? I have looked in my manuals and the internet for a diagram of the fresh air systems. But no luck.

So thanks for any tips you can provide.