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2003 Explorer, Continuous Water Pump Problems

WoodCJ7

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City, State
Broomfield, Colorado
Year, Model & Trim Level
2003 Ford Explorer XLS
I am looking for advice on continuous water pump problems, 2003 Explorer, 4L, V6. We are the 3rd owner. Here's some history:

Original Owner Records:
Nov 2004 - Coolant Recovery Tank, Tstat, and Oring Replaced
Nov 2006 - Owner complained of leaking coolant. Pressure tested and found water pump leaking. Recommend replacement of water pump and owner refused.
Jan 2007 - Water Pump Replaced
Apr 2008 - Cooling system flushed, chemically cleaned, pressure tested

2nd Owners Records (Relative):
Apr 2009 - Water Pump, Tstat Replaced
Mar 2011 - Water Pump Replaced

Our Records (We purchased in Nov 2012):
Dec 2014 - Water Pump Replaced
Oct 2015 - Water Pump Leaking - AGAIN!

As you can see there is a history of continuous problems with the water pump. Prior to replacing again, does anyone have any suggestions? Is there something else that has been overlooked?

Thanks for your help!
 



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Number4

"I'm counting to 3, then I'm getting your dad."
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04 Ford Explorer 4.6l
Need to know how it's failing. Is it leaking via a weep hole?
Is it leaking at the oring (mounting surface)?
 






rwt101

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This is really going out on a limb, but I wonder if the thermostat housing is leaking and maybe running down. towards the water pump and people are getting the wrong diagnoses.
I know that is a little crazy.
Bob T
:usa:
 






Joe in NY

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2002 Eddie Bauer V8 4X4
Also, chemical cleaning? What coolant? Could be destroying seals..

Also, doesn't exhaust gases in coolant make the coolant acidic?
 






WoodCJ7

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It looks as if it's leaking at the seal.
 






WoodCJ7

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As far as the chemical cleaning, I'm reading that from the records of the original owner. I don't have any other details.
 






Number4

"I'm counting to 3, then I'm getting your dad."
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It looks as if it's leaking at the seal.

Where it seals against the block?

If it's at the block, remove a bolt, put some blue loctite on it and put it back in. Then move to the next bolt.

First though, hit them all with a torque wrench and see if they've come loose.
It's possible that there's a gouge in the mating surface too.

If it's coming out of the weep hole, it could be that the belt is too taught.

Can you post some pictures of the area where the leak is?
 






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