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Letting your car idle isn't actively bad for the drive train, but it certainly does put strain on the engine, additionally engaging the AC will put the engine under load, and work the engine harder even though you're not driving anywhere.
Checking to see if the Idle Control Valve is Functioning. 1  1. Use a code scanner to check error codes. 2  2. Start the engine and take note of the idle RPMs. 3  3. Shut the car off and disconnect the Idle Control Motor.  4. Restart the 1  engine. 5. Look for a difference in idle speed.  6. Shut off the engine and reconnect the Idle Control Motor.