Can your fuses go bad and cause your air and defrost not to work?

Yes, fuses can go bad and cause issues with your air conditioning and defrost systems. If a fuse related to the climate control system is blown, it may prevent the air conditioning from functioning properly or inhibit the defrost feature. Checking and replacing any blown fuses is a good first step when troubleshooting these systems. However, if the fuses are intact, further diagnosis may be needed to identify other potential issues.