Hi and thanks for using 2CarPros.
First, take a look through this link. It discusses water pump issues and how to check one.
https://www.2carpros.com/articles/symptoms-of-a-bad-water-pump
If the pump is bad, here are general directions for replacement.
https://www.2carpros.com/articles/water-pump-replacement
If you find it is not the water pump, here is a link that shows how to find and repair a coolant leak. Since the coolant leaks out so quickly, I do not see the need for a pressure test.
https://www.2carpros.com/articles/car-is-leaking-coolant
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Let me know if that helps. If you find the pump does need replaced, let me know if this is for a 3.0L or 4.0L V6 engine so I can provide specific directions.
In addition, if you have to drain the coolant to replace the pump, consider replacing old hoses, the thermostat, and it is a good time to flush the system. It is easier to do it at this point because if something fails, you have to drain the coolant all over again.
https://www.2carpros.com/articles/replace-thermostat
https://www.2carpros.com/articles/replace-radiator-hoses
https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars
Let me know if this helps or if you have other questions.
Take care,
Joe
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Tuesday, November 20th, 2018 AT 6:36 PM