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Old 07-09-2012, 08:32 AM   #1
speedy5489
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Default Water pump issue - need help

Working on my girlfriends car yesterday replacing the IM gasket and water pump and ran into a problem. Water pump had been leaking, purchased a GMB pump to replace it. When the new pump was installed, it had a good size leak on the top side of it. After taking the pump back off, double checking the gasket to make sure it was on properly, I noticed there is a hole in the block on the top side where it was leaking. Then comparing the old pump to the new, it appears the GMB pump has a raised contact area and won't sit flush against that hole. Gasket looks like it's designed to just cap it off, too. So, couple questions...

-What does this hole do?
-What pumps fit correctly so I don't run into this issue again?

I would post pics, but I can't until I have 15 posts...

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Old 07-09-2012, 09:12 AM   #2
hoseppi
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Default Re: Water pump issue - need help

Is this an S series car? I've replaced a lot of waterpumps on these cars and have never had an issue like you are talking about.

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Old 07-09-2012, 09:16 AM   #3
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Default Re: Water pump issue - need help

Year and model?

You can attach pictures using the "Attachment" feature - the paper clip icon above the editor window.

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Old 07-09-2012, 09:19 AM   #4
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Default Re: Water pump issue - need help

Quote:
Originally Posted by speedy5489 View Post
Working on my girlfriends car yesterday replacing the IM gasket and water pump and ran into a problem. Water pump had been leaking, purchased a GMB pump to replace it. When the new pump was installed, it had a good size leak on the top side of it. After taking the pump back off, double checking the gasket to make sure it was on properly, I noticed there is a hole in the block on the top side where it was leaking. Then comparing the old pump to the new, it appears the GMB pump has a raised contact area and won't sit flush against that hole. Gasket looks like it's designed to just cap it off, too. So, couple questions...

-What does this hole do?
-What pumps fit correctly so I don't run into this issue again?

I would post pics, but I can't until I have 15 posts...
The hole is an internal vent so the pump does not cavitate when running a low concentration of antifreeze (less than 50%). Keep the concentration where it belongs and you don't need it. Just get one of the other stamped metal pumps. There is not that much difference in quality right now. Name brands are superior to house brands usually though.

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Old 07-09-2012, 04:48 PM   #5
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Default Re: Water pump issue - need help

Gah, I didn't even think about attaching a pic, I've always done IMG links.

It's an 01 SC1, right around 100k on the clock.

Coolant concentration has been 50/50 and nothing but. Been mixing it myself with spare coolant jugs.
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Old 07-11-2012, 10:54 AM   #6
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Default Re: Water pump issue - need help

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Originally Posted by speedy5489 View Post
Coolant concentration has been 50/50 and nothing but. Been mixing it myself with spare coolant jugs.
When you drain and fill your system, unless you removed the hoses from the heater core, about 1 qt of fluid will remain in the heater core.

If you only drained and refilled, you should be OK

However, if you flush the system with water, then that quart in the heater core is mostly water. When you refill with 50/50, your final mix is less than 50/50, once it mixes with the water in the heater core.

That is why OldNuc advises (when refiling) to add 1 full gallon of 100% antifreeze, then topping off with distilled. It will mix quickly in the system and iirc, you should end up with something like 57/43, which provides adequate antifreeze protection (if you are in a warm climate you are probably fine with what you are doing)

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