Can anyone give me a solution to my car s A/C problem?

I have a 1998 Honda Civic LX and my A/C switch isn't fully working. It has 4 temperature ranges. Number 1 and 2 stop working a long time ago and now the A/C only works on the highest settings which are 3 and 4. How do I fix it so I can get 1 and 2 working again?

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