A/C compressor replaced 2 years ago. A/C cools fine for 20 minutes but air flow declines and stops cooling. If I switch to Vent for 5 minutes the air flow comes back. If I then switch back to A?C it cools again for about 20 min. It seems that the evaporator must be freezing up and the vent helps to defrost it. How do I fix?
 
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Question: A/C cools for 20 min. Then air flow declines. Switch to Vent for 5 min. fixes.
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