Hole in block size of pencil

  • 2004 AUDI A4
  • 3.0L
  • V6
  • AWD
  • 135,000 MILES
I have a 2004 audi a4 3.O quattro with a tiny pencil sized hole in the front of the engine bottom right side under the belts. There's no noticeable difference with the performance but a tiny coolant leak, I'd say 1pt over a week lost. No oil leak
Do you
have the same problem?
Saturday, July 9th, 2016 AT 5:39 AM

1 Reply

Hold on. We're losing something in translation here. A pencil-sized hole would leak all the coolant out in a few minutes and the engine would be overheating. You'd lose a pint of coolant in a few seconds, not a week. If you have a pencil-sized spot of rust or corrosion where you see coolant leaking from, that suggests you have a corroded core plug, often referred to as a "freeze" plug because they can pop out if the coolant is too much water and it freezes. Core plugs can be replaced but you have to buy the correct size for the application.

A much better suspect is a leaking seal in the water pump. The hole you're seeing the coolant drip from is likely the weep hole or the drain hole for any coolant that leaks into that area. A water pump seal will usually start out leaking rather slowly, but don't expect it to stay that way for long. If possible, post a picture of where the leaking is coming from. If it's a plastic cover or shield, that is covering whatever is really leaking. You'll need to remove it and dig down further to find the cause.
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Sunday, July 10th, 2016 AT 8:42 PM

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