My Airbag light has been on for awhile but recently my left headlight, low beam doesn't work. I switched the headlight and still no luck on low beams, the right side works perfectly (low and high beam), fog lights work and so do brake lights etc. But my A/C does not blow cold air anymore, are any of these related to some type of relay or switch, is it a problem with the fuses? Thanks in advance for the help.

 

All your problems you are experiencing seem to be separate.
To diagnose a headlamp try swapping the low beam bulbs side to side, if the bulb works on the right side but not the left the ignitor or (ballast) is bad on the left side. If the bulb doesn't work on either side then the bulb is bad.
As for the airbag light pull the fault codes and post them, most likely its a bad air bag on the driver's seat.
For the A/C check to see if the control head is always in ECON mode which either indicates the refrigerant has leaked out, or you replaced the control head with a new one and didn't adapt the temp flap doors.