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When you say you can't "encode" the remote to open the doors, do you mean you can't program the remote to activate the locks?
If so go through the normal steps of diagnosis. 1. Battery in the remote is good? 2. Proper remote part number for the car? 3. Check the immobilizer and make sure it is the correct one for the car (Some did not have remotes like my car). 4 Check the immobilizer for water damage.
The A/C-Heat issue sounds like a blend door actuator calibration issue or failure
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