"would grounding to the Phone Connector in the center console be the same as grounding to a chassis point?"
The problem with the phone connector is that the conductors are only rated at 7.5 Amps(E6 fuse). If you ar using that for the control(not power) of the relay - O.K.
In a hot climate the engine bay needs all the cooling it can get.The common mod is to move the temp sensor in the Bank 1 inlet manifold closer to the engine so it activates sooner/longer.
Good Luck with your mod
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