Rt Headlight not working warning low coolant but reservoir if full, AC not working

it is unlikely. Most likely you have a combination of faults. The coolant reservoir will have a sensor integrated into the reservoir and are common to fail, first you could check the electrical connector to confirm its still plugged in to alleviate something simple. Have you replaced the left headlamp bulb and found it still does not operate? The ac system may need to be recharged or have a malfunctioning HVAC actuator / door. May be worth taking in to a service center in the event things become more complicated than not.