Buying new water pump, 04 5.3 v8, 1.88 or 2.05 dia, new or reman.

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by Bowtied, Jul 4, 2013.

  1. Bowtied

    Bowtied Epic Member 5+ Years 500 Posts

    Hi guys, I finally have enough money together to get a new water pump (generic one from autozone or similar)

    i have what i believe to be a 1.88 thermostat inlet diameter water pump on my 04 5.3 v8 but im wondering if i should get the 2.05 inlet diameter as the "1 piece" thermostat housing + thermostat is replaceable on these units where as the 1.88 you have to replace the thermostat and o-ring gasket (and i was unable to find new housings at auto zone for this particular thermostat housing)

    But I am not able to find parts for it, calling just now to see if i could get a replacement housing for the thermostat takes 2 days, and the 2.05" diameter just seem to be more common for this parts.

    The pic below shows my 1.88" D Thermostat and a 2.05" D Thermostat + Housing,


    Since my water pump shows signs of failing im just at a cross-roads since i already bought and replaced the 1.88"D Thermostat but cant find a housing for it should I buy a new water pump with the 2.05" D and get the thermostat and be done with it?

    Also, how do you guys feel about Generic or Non-OEM Water pumps, whether new or remanufactured?
    Last edited: Jul 4, 2013
  2. Pikey

    Pikey Moderator Staff Member 5+ Years ROTM Winner 5000 Posts

    My father and I both put water pumps from advance auto on our trucks. We never had an issue. I had the style with just the replaceable t stat. His was the t-stat and housing together. I am pretty sure that they are interchangeable. I bet that you could get the new housing at a dealer.

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