I bet you can at least block some of the grill. It won't have as large of an effect as colder climates, but you're also pushing yourself through less dense air, have less warm up time, etc. So you already have an advantage of sorts over colder climates. Like Teoman said, just monitor how much your radiator fan is coming on. You don't want it running a ton. I don't mind mine turning on a couple times on my commute because the faster warm up is worth it to me. Alternatively, you can make a grill block that you can open up and close.
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