Before you do you might want to try something like this. Turn the vent on so you're bringing in outside air. Turn the fan on full.
Go outside and spray some kind of antibacterial spray. Like Lysol Disinfectant spray into the vent intake at the base of the windshield.
With a "cherry" smell it's probably something in the fabric in the cab. Rug, upholstery, headliner. But you never know.