I’ve got a 2018 sxt charger, that a/c fan slows down when car hits higher speeds. I’ve changed resistor twice. The first time the resistor wouldn’t let fan speed up past 3 , changed it thought I fixed it. Now when going high speed it kicks down to slower speed making it hot in car. Cold air still coming out but not being pushed by fan. Is there something else in system that would control speed of fan?