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  1. #1
    Jr. Mechanic Bowtied's Avatar
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    May 2009
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    2004 Silverado 5.3L
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    132

    Default Searching for the weep hole on my water pump

    Hey guys, im trying to diagnose why my thermostat replacement (that worked for 1 week) is now causing the water to leak from the water pump area (I put blue gasket maker around the thermostat housing when I reattached the thermostat the second time so theres no way its leaking from the housing) and I have heard people mention the weep hole from dying water pumps but I cannot seem to find it on my truck. can someone please point it out in this picture? this appears to be the style water pump I have except its specified as a 2.05 inlet whereas mine is the 1.88 diameter thermostat inlet. it is also possible that the gasket has been breached and water is leaking from behind the pump which is making things quite hard to diagnose sorry for the wall of text my "enter" key isn't working at the moment. Click image for larger version. 

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    well I just got out from underneath the truck and to the best of my inspection I can either assume that its leaking from the gasket or the bottom of the pump has a crack in it because water is "welling" out of the bottom in a way that would either be inidicative of a slight crack in the equipment or a breach of the gasket. mind you that, the truck was only slightly temping up then cooling itself down, which led me to believe it was the thermostat in the first place, then after replacing the thermostat everything was fine for a week (not even a raise in temp) and then I started noticed coolant slowly leaking out from under the truck then a few days passed and the coolant leak kept getting worse and worse.
    Last edited by Bowtied; 06-23-2013 at 01:26 PM.

  2. #2

    Default

    What year is your truck? I have 2002 and mine is leaking from the gaskets on the water pump. I was told by a GM tech that it was common.
    02GMC2500 4X4 extcab.Kenda Mud tires.3"Magnaflow true dual Exhaust.throttle body spacer with K&N air filter.Hypertech programmer.White LED dash lights.LED back up lights and marker lights.LED cab lights.LED interior lights.6000k HID conversion lows, with high/low conversion.Installed Center Console

  3. #3

    Default

    My 2003 leaked from the gaskets also. I did a pressure test and it poured out at around 12 psi. I installed a new pump instead of just changing the gaskets. My dad's 02 leaked from an o-ring sealing a cover on the back side of the pump. You can buy a new o-ring for it. He also just chose to install a new pump after taking it all apart.

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors, http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  4. #4

    Default

    Yea im due for a pump right now on my 01, i plan on doing the hoses while im there.
    01' 1500 LT Z71 ECSB 5.3L
    line-x'd front brush guard with KC Daylighters, 6000k HID lows and highs, rewired highbeams, Trans-go mild shift kit, custom stainless duals, 3500 dually OEM taillights, K&N CAI. Still have OEM fender flairs and leveling kit in boxes waiting for time.


  5. #5
    Jr. Mechanic Bowtied's Avatar
    Join Date
    May 2009
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    2004 Silverado 5.3L
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    132

    Default

    Sorry about that, i got a 2004 model, y'know i just checked my "profile" and its listed under vehicles but that part doesnt show up underneath your forum handle, i just put it in the "location" instead, now everyone can see it

    I will likely be replacing the entire pump as well as the gaskets, but im worried because I cant afford an OEM one, and i dont want to buy some POS from Autozone (whether new or remanufactured)

    What are yall's opinions on the remanufactured or new but generic water pumps that go for ~75-150?

  6. #6

    Default

    Rockauto has ac delco for $125 for steel impeller, im just saving up til i can afford all the hoses. Going to be about $200 for the quality stuff. Still have not made up my mind on which brand to use for hoses. I also tried to find a high volume wp with no luck.
    01' 1500 LT Z71 ECSB 5.3L
    line-x'd front brush guard with KC Daylighters, 6000k HID lows and highs, rewired highbeams, Trans-go mild shift kit, custom stainless duals, 3500 dually OEM taillights, K&N CAI. Still have OEM fender flairs and leveling kit in boxes waiting for time.


  7. #7
    Legend

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    Sep 2010
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    everett, massachusetts
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    1,323

    Default

    I think stated this before. the water pump gaskets should be replaced. they are a known failure with these engines. replacing these are easy. replacing the water pump is a much harder job since the fan must be removed. on removal of the water pump you will clearly see the weep hole. also if you remove all the components around the water pump and using a good sized mirror with a light in a dark setting you can see the weep hole. when the gaskets leak the coolant flows around many seams on the block so it is hard to find exactly where its coming from.

    the fastest easy way to know if its these gaskets is to use some coolant sealer .If it stops then its the gaskets . if it does not stop it is the water pump seal/bearing.

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