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Re: Dual climate control blowing heat on AC
With the DCCV disconnected, it should have allowed full coolant flow if working properly. When the valves receive battery voltage, they close.
Based on my experiences with my wife's DATC and a few others on this forum, I'd suggest switching around the Evaporator Core discharge temp sensor with the driver's side air discharge temp sensor. On the earlier LS, those two sensors are the same part number, along with the passenger side air discharge temperature sensor.
-Rod
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