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You need a special tool you can borrow from any decent auto parts store just by leaving a deposit, go to caddyinfo.com and I am in the middle of posting a full thread on this as well as replacing the water pump housing gaskets. The water pump is a easy job, the hardest part is taking the pump itself out with the special tool - that's a little tricky, did you use a pressure tester and make sure the water pump was leaking and its not a hose or something else. There's about 11 different reasons you can be losing coolant and or running hot. Its about a 2-3 hour job all in, there are great directions on that forum
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