1993 Buick Park Avenue

1993 Buick Park Avenue

my car makes this noise from my dashboard. Like a clicking sound then my air conditioner wont work nor my heater it did this once before and I had it fixed. What is this and why does this happen at least once a year.I am a sickly woman that has to go to many doctor appointments and it is soooo hot outside that sometimes I have to cancel my appointments dur to the heat. Please help me at this moment I cannot make a donation but hopefully when I get my answer I will be able to make a donation.I think someone said ac valve?