My 1988 740 Station Wagon has developed a number of foibles, the latest
being that the radio antenna doesn't go up and down. I have the "car
wash" switch set for antenna to work, and I hear the motor going when I
turn radio on or off.

I managed to open up the antenna assembly, but it's all rather
confusing. Sort of a chain drive, and what appears to be an air hose
going to the bottom.

Is this fixable? If not, do I need an antenna specifically made for
Volvo?

thanks in advance

chas