Check the wiring. The high / low are separate wires running from the thermostat to the A/C unit(s). It's *possible* that they sacrificed the low speed wire to use it for another function, such as a heat strip in the A/C. If your thermostat has an elec. heat option, or you know that your A/C has a heat strip, then this would be the wire they used. Then again, I have heat strips on my mind for some reason.
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Karl - Southeast, NY
2020 377 RLBH
2018 Ram 3500 Mega Limited 6.7L Cummins w/ Aisin
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