I can't be leave no one has had this problem. Need help.

Has no one had this problem?

Hello all my first post. I just brought a 2002 v70 xc one owner car with 23,000 miles on it. This car had a bad musty smell when I got it, i replaced the cabin air filter and also sprayed a can of re frig a fresh in the duct work this fixed my musty smell. Now that i need heat here in Delaware i not...