How do I stop condensation in my car?

Most mornings I have a big problem with condensation on the inside of all of my windows in my car. The car in quite old so the window seals aren't perfect, this could be causing some of it. But does anyone have any helpful tips on how to prevent this condensation?
Simon, December 2004


done
Do you park in a heated garage? I do, and this causes my windows to steam, and some days frost up. I've had to use an ice scraper on the inside. As for solving the problem, I have yet to figure that out, other than not parking in the garage....

Eric, February 2008
Are you having to add coolant to your radiador>>? If so you might have a heater core leaking..

bg, November 2005
you may have wet carpets due to a leak

colin bedford keys, December 2004
Once I saw an old Fiesta with bags of silica gel dryer lying on the tray under the rear window. Maybe that would help. My 1985 Fiesta has the same problem and sometimes I have to use a squeegee and rag to take all the condensation off the inside windows in the mornings.

TomF, December 2004