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Q: What am I missing my ac blows only hot air? on 1997 Ford Explorer

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I have a 1997 ford explorer ac compressor turns on mechanic put freon no leaks I can hear a pop when I turn the ac on like a door opening any idea what it can be?
(2) Answers
(1) Comments
Check the heater control valve under the hood. It's installed in the heater hose and it is supposed to cut off the hot coolant entering the HVAC system when A/C is selected!! IF it is not closing, A/C won't cool!!! Actuated by vacuum, common for vac. line to break.
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