My 2003 PT Cruiser has a smell of damp mold. I have celaned it out and even ran an ozone machine but to no avail. Any recommendations?

Mold is from something being wet for a long time, usually in the carpet. Just try and clean top to bottom, and if the smell is still there, may have to pull out the carpet.

I would use a moisture absorbent, clean the carpet and check for leaks. You may have to replace the carpet though. If you can, park it in a garage and keep the windows cracked open. You could also park it in a sunny place with the windows open.