The cap on the coolant tank IS the radiator cap. its all under pressure. fill the tank to the full line.
There is no radiator cap. The over flow tank is part of the cooling system and feeds coolant directly into it (and/or circulates coolant through it). Unlike a true overflow that will just catch any excessive coolant and store it until the radiator cools down and sucks it back in.
So think of the reservoir on your vehicle an extension of the side tank of your radiator.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
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