Manuals through 2025 now available!
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LEMON is the spiritual successor to CHARM, I recommend you try it!
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Control Assembly: Testing and Inspection
Refer to
Heating and Air Conditioning for instructions on how to use the DRB III scan tool or the control head self-diagnostics to test the part. The problem is not with the control head if no trouble codes are found. The next step should be to check the rest of the system after the A/C-Heater or ATC control is checked.