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jBlaze3000

Water Pump Question - GMT800

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Got a leaky water pump on my 2000 Suburban 1500 LT. Looking at the replacements on Rock Auto I see there are 2 different versions - one for a 1.88" thermostat outlet and one for a 2.05" thermostat outlet.

 

Wondering if there is a way to tell which pump I have with taking the thermostat off and measuring. Vehicle options, VIN #, hose size? I'm assuming worst case scenario is if I buy the wrong one I just need a new thermostat?

 

I know someone on here has been through this before. Thanks in advance.

 

 

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Just checked my VIN number and it matches the one in your link so I have the 2.05" outlet. Think I'm good to go. Thanks!

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In the video... He DOESN'T "apply a thin layer of RTV on both sides of the gasket" as directed in my Haynes manual.

Who's correct?

 

To RTV or not to RTV? THAT is the question...

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For what it's worth, the GM service manual makes no mention of using RTV either...

Edited by bossier62guy

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Not

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Need some help.

 

2003 Sierra 1500, 5.3L.

 

VIN: 1GCEK19T13E330126

 

How do I know what size I have? 2.02" Diameter thermostat Outlet or 1.88" Diameter? And it's the original water pump I'm replacing. Someone else told me I must replace thermostat regardless, I hope that's not true? It's fine.

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