Could be a number of reasons. It's pretty much impossible to narrow it down without knowing what the actual symptoms are. When you say your AC doesn't start, you could mean the blower fan isn't kicking on, you could mean your AC compressor isn't kicking on.... the question's much too vague.
a mammal that starts C is a COW
Your clavicle bone starts with c.
What kind of arthritis starts with a c
C
Car is another word for truck that starts with a "c".
a song that starts with the letter c by blondie is called "call me"
Cricket starts with c but not k because that is the correct grammar.
A word that starts with C and means "accident prone" is "clumsy".
candy starts with a C!
revouluitionwar
Something scary that starts with C is cancer.
Corsica is a French island that starts with a "C."