Are you sure the compressors in both units are running? Sometimes, it is hard to tell if one isn't working. No need to keep both units on high fan, there is a freeze sensor from the thermostat control box in both units that is inserted in the coil and prevents freeze-up in the coil.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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