I don't know the speed threshold. It isn't something the tech would deal with- Chrysler dictates it in the PCM software. What it ought to be is closed until coolant temp rises to a set threshold- who cares what the grille is doing if you don't need cooling yet, and if you do need cooling you need it regardless of your speed.
Clever would be hacking the PCM. Effective would be an override that keeps it shut until the temp passes a threshold, then allows the PCM to do its thing. Of course, it might take a lot of clever to do that without getting the computers mad:
Quote:
To aid with diagnosis, the grill shutter vanes can be commanded to the open or closed positions with a scan tool. The active grill shutters perform an initialization each time the vehicle is started. The initialization can be used as a quick way to validate the operation of the AGS. To perform the AGS validation, start the engine and observe the grill shutters, the shutters will cycle to the fully open position and then to the fully closed positions to initialize and learn the hard stops on the grill shutter frame for that key cycle.
If the AGS smart module detects the grill shutters are jammed, it will attempt to free them by cycling the shutters from the open to close positions 3 times. If this condition is detected when the ambient air temperature is greater than 4.4° C (40° F) the MIL will illuminate and a diagnostic trouble code (DTC) will set. If the ambient air temperature is below 4.4° C (40° F) and a jammed condition is detected, the smart module will assume the shutters are frozen and will not illuminate the MIL or set a DTC.
The active grill shutter assembly contains an integral smart module, the module receives a command position signal from the PCM to properly position the shutter vanes. The AGS module reports the position to the PCM on the LIN bus. The AGS module four-pin connector also contains a battery voltage, ignition voltage, and a ground circuit.
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It would be good to allow it to do its diagnostic hokey-pokey, and might be difficult to override the system without throwing a CEL.