yeah its a false reading, its reading the air thats stuck in there not the water. wait till it cools off and there is no pressure in the system then:
1) take the coolant burp bolt out and fill the radiator up till it starts coming out of the burp hole.
2) put the bolt back then mess with the hoses a little and get the bubbles out.
works for me but i believe the fsm might have a little different procedure
edit: yeah your water pump is why it got like that, replace that leaky water pump asap
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