I have a 1998 V6 Nissan Maxima with approx 154k miles. My a/c fan is blowing on 4 all time, will not adjust down (manual or auto) when interior temp is cold. I can adjust the temp. Up or down manually, it won’t auto. Then when a/c turned off air blows at feet vent. After replacing the expansion valve is when all this started. The automatic dash controller was replaced last month. Thanks for any help!