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This is a 1500 forum, so not likely to get much traction here.
That being said, can you ohm out the heater element?
Not sure what it should read, but it won't be OL on the meter. 0 would pop a fuse.
If the truck is still tuned, I hope you have the device the PCM is married to or the original...
Sorry to hear you're having issues, but it sounds like the PO may have had issues as well.
Don't let something someone else dumped be a benchmark for the brand.
Mine does this on remote start.
Otherwise, it almost never gets moved to defrost mode. Defrost starts your compressor, so you will need airflow to keep from flooding liquid back to the compressor and tearing it up.
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