As the charger operates and as the new PHEV battery pack charges and discharges, heat will be generated. The charger will automatically reduce the current flow to the batteries if the temperature gets too hot (currently over 104 degrees). These cooling fans will exhaust the hot air from the charger and batteries out of the vehicle. They are installed over an OEM flapper vent that is intended to let air out of the vehicle and prevent atmospheric pressure inside the cabin.
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