Okay. One of them claimed he'd replaced some part, even though I was watching all the time and didn't see him do it, and even though the hose that was involved would have broken if moved but it was still there, and as stiff as ever. I complained and he said the main office would send me a coupon but it didn't. Never been back.
This is not the first time I read about some cabin air filter. I thought it referred to an airplane. I didn't even know what a cabin is wrt a car.
But I just checked and a 2005 Solara does have such a filter. The previous owner took good care of the car, so maybe she replaced it already. I guess I should look at it first, but thanks for bring up the topic.
After driving with the top down half the year, cleaning the air the other six months doesn't seem too important, but maybe I can use a lower fan speed if it's clean.