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You say the heater works fine, so does the temp get warmer when you turn the dial to max heat and get less warm when you turn it back? If so then the blend door is moving/working.
A way to test if a/c is good is when the windshield is foggy set it to defrost with snowflake on and circulation off, temp at any warm setting, if windshield clears then a/c is working.
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