Clean the reservoir and flush the cooling system.
Your coolant is low. Add some antifreeze to the reservoir under your hood.
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it takes dex-cool coolant,
A surge tank is basically a pressurized coolant reservoir. As your engine heats and cools the coolant expands and contracts. Because of this You need a place for extra coolant to go to when it expands and be drawn from when it contracts. Conventionally the recovery tank or reservoir was not pressurized. A tube from the radiator cap allowed coolant to be sucked and drained in to the reservoir. However, on many newer vehicles like yours the reservoir is pressurized and called a surge tank.
radiator antifreeze coolant.
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if coolant is ok!! then check coolant sensor.
the thermostat is in the coolant cap
13.6 qts
A pressurized coolant reservoir would have a thread on cap which acts as the " rad " cap
no cap, just the coolant tank, add to this to add coolant../
it looks like a radiator with coolant in! it should be red.