Why does my ac stop blowing cold after about 20 minutes of me driving? on 2006 Chevrolet Equinox

My air stops blowing cold and only starts bac after it has seemingly cooled down, someone please help me.

by in Sagle, ID on June 26, 2013
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1 answer
ANSWER by , June 26, 2013
have the freon level ck'd and maybe have an a/c service done