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

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?
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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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