first thing i'd check is the relay. you can swap it with one of your fan relays temporarily; they're the same.
i'd be tempted to just delete the AIR pump instead of replace it, for what it's worth. it's really just there to help your cats warm up faster.
i'd be tempted to just delete the AIR pump instead of replace it, for what it's worth. it's really just there to help your cats warm up faster.