need some help - coolant leak

**drexplode** · 10-31-2008 05:20 PM

Hey guys, I just got home about 20 mins ago and then poke my head into the garage and found a small coolant leak on the ground. Open up the reservoir and it gushes out.

Checked the following:
-coolant reservoir
-coolant hoses to radiator
-radiator

I cant think of another place where it would be coming from. It appears the drips are coming from somewhere in the middle of the engine (not the back, not the front). My mechanic thought it might be the coolant temp sensor...?

What are your thoughts???

Car = 1999 A4 2.8 w/ 117k miles.

pics:

**s42k5b** · 10-31-2008 05:27 PM

not sure if the CTS would cause it to leak. It could be coming from you aux water pump

**drexplode** · 10-31-2008 05:37 PM

sorry guys, i just realized i posted in the S4 forum...doh!

**purchasers4** · 11-01-2008 06:32 PM

not a big deal; the water gushing is normal our systems work under pressure when hot

**1997gtx** · 11-01-2008 08:23 PM

Moving to A4 section for 'ya ... If it were an S4, i'd be the after-run pump / aux. water pump.
--Adam

**baboom** · 11-01-2008 11:04 PM

in the back of the cylinder head there is a flange going into your block it id a common problem check it out!!

**drexplode** · 11-01-2008 11:08 PM

root cause was determined to be a hose on the back of the aux water pump. Should be fixed by mon/tues.

**1997gtx** · 11-02-2008 07:42 AM

Seems to be the same problem on the S4 and A4 :)

Glad it's gonna be an easy fix

--Adam

**lukepl** · 11-02-2008 09:39 PM

im having the same problem except in mine i go from min to empty on the coolant reservoir in a month. I would like to find the source of the leak. Where is the water pump located? any diagram available? thx