If its really that hot I'd recommend a window shade/reflector thing, cracking your windows, and/or parking in shade when possible. That'll really helps and won't heat soak the batteries.
The ammeter measures how much power (in amps) is being drawn from or put into the battery pack. Once you exceed the maximum regen the physical brakes engage and you're wasting energy that could be captured. This is very easy to do at higher speeds, and can be at low speeds too unless you have a meter saying so.
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