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Quake 4 Hints
How do I get the coolant pumps shut down?
1 of 4: After checking out the huge and wonderful supply cache in the control room you're in, head out through its unlocked door.
2 of 4: When you reach a room with a curvy walkway, check one end of it for even more supplies. (Something big must be coming up!)
3 of 4: When you come to a large open room with a small computer in the center of it, save your game before using the computer panel.
4 of 4: Sure, it'll shut down the coolant pumps, but it'll also start up a major boss battle sequence.