So I got a brand new ACDelco water pump to install on my 1994 SC300, and noticed a strange hole on the top of the pump. This hole is separate from the weep hole on the bottom of the pump and is not threaded. I was wondering if I need to somehow plug this hole and how I would go about such a thing? I've exhausted all the search options trying to find info on this and had no luck. Photos for reference.

 

Are you planning on selling your car soon? If not return that ASAP and get the Aisin.

 

Not to sound rude but why?

 

Made in China parts are suspect especially critical parts like a water pump. How much are you even saving? Nothing against China these parts are built to a price point.

 

ACDelco is a US brand tho isnt it? I was always under the impression they are good. Personally i go with Gates parts though

 

OMG the hole is designed in. It is called a weep hole. When the shaft seal ruptures antifreeze will drip out to alert you the pump is failing.
Install that thing & be done w/ it.

 

I've seen so many of those generic pumps fail. And yes that's a generic in a Delco box. Best of luck.
You sure?

 

Yes

I would personally only use a Toyota or Aisin pump due to the amount of work it takes to replace it again if it fails. The dealer pump has a small metal tube hanging out instead of a hole, same purpose.

 

I've got it installed and it sounds like the pump has 2 weep holes, one with the metal tube hanging out, and the other is the hole I was perplexed about. Thanks for the info!