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Q: heat/cooling on 2000 Chrysler 300M

ran internal diagnostic on heat.code came back 23.problem is no heat.what is code 23?thanks
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Customer Concern: No heat and code 23 in the Automatic Temperature Control (ATC) system.
Tests/Procedures: 1. Check for voltage across the driver wires (Brown/White wire and Dark Blue/Red wire) at the blend air door actuator while running a self-diagnostic test. To run self-diagnostics, press and hold the floor, mix, and defrost buttons for 3-5 seconds.

2. If at least 10 volts when going through the diagnostic test, but no change in temperature, the actuator is faulty.
Potential Causes: Blend Air Door Actuator

Tech Tips: Code 23 is for the blend air door actuator.
Diagnostic Codes: 23
on our 2000 300 M ,,,How do I run a diagnosis check on my heat /ac system. I have not much heat in the cab. Engine temp is fine.

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