On occasion, my rear hvac blower will kick on a running despite the car being off and regardless of the rear controls being in the off position. This has drained the battery a few times. I've replaced the rear HVAC module and one of the rear blend actuators last winter to try and fix the rear hvac not blowing warm air, and that was resolved. For now I've pulled the REAR HVAC fuse, but with it getting cold fast, it'd be nice to use rear heat without running the risk of draining the battery. Any ideas what to check? if i hadn't replaced the rear control module already i would probably start there.