Fast Coolant Leak From Behind Pulley

Tiny
TYAZZ
  • 1999 VOLKSWAGEN JETTA
  • 170 MILES

The Jetta leaks coolant fast from behind a pulley loacted just above the oil pan. I can not find any wet spots anywhere around it, but it leaks fast from behind it. The pulley is the largest pulley involved with the serpentine belt. Maybe crank shaft pulley. I dont see coolant in the oil yet, but im sure itll work its way through the oil pan gasket eventually.

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Saturday, February 18th, 2012 AT 5:45 PM

16 Replies

Tiny
MERLIN2021
  • EXPERT
  • 17,556 POSTS

Probably the timing cover gasket or water pump.

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Saturday, February 18th, 2012 AT 7:15 PM
Tiny
EXOVCDS
  • MEMBER

Water pump. Don't worry, coolant can't leak into the oil pan
through the oil pan gasket.

To replace the water pump, you need to remove the timing belt. So
be sure to install a new T-belt & tensioner as well.

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Sunday, February 19th, 2012 AT 12:04 AM
Tiny
TYAZZ
  • MEMBER

I dont have the know-how to do this myself. Is it even cost effective to have the water pump and timing belt changed on a 99 Jetta with 180k miles in fair condition?

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Sunday, February 19th, 2012 AT 6:14 PM
Tiny
EXOVCDS
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Just to make sure, we are talking about the A4 model VW Jetta, right?
Should look like this:

If the car has been maintained/serviced regularly, it will still
have quite a bit of life/years left! Many variables obviously,
but it would sell for more money (should you decide to sell it)
if the leak were repaired! :-)

Take it to a VW Specialty shop for an estimate. Prices can
vary, so you might want to see two shops. Don't just take my word
for it and phone for an estimate. Since I can't see the leak, my
best guess at this time is water pump.

The 1.8T, 1.9TDi, 2.0 & VR6 engines will all have water dripping
from behind the big crankshaft pulley when the water pump leaks.

Good luck!

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Sunday, February 19th, 2012 AT 6:26 PM
Tiny
TYAZZ
  • MEMBER

Before I go and buy these parts and pay someone to do it. Could it be the crank shaft pulley seal? Or would that be oil leaking out?

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Sunday, February 19th, 2012 AT 6:31 PM
Tiny
TYAZZ
  • MEMBER

And yes thats what the car looks like.

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Sunday, February 19th, 2012 AT 6:33 PM
Tiny
EXOVCDS
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Sorry about the late reply. Had a phone call.

Crank shaft pulley will leak oil, not coolant. What engine is in
your car?

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Sunday, February 19th, 2012 AT 7:00 PM
Tiny
EXOVCDS
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Don't buy any parts until you have someone verify where the leak
is coming from!

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Sunday, February 19th, 2012 AT 7:01 PM
Tiny
TYAZZ
  • MEMBER

The engine is a 2.0. Ok, il have it verfied first. But I took the undercariage covers off, the oil pan cover, and the engine covers and could not find any wet spots at all. I couldnt even find any moisture on the top side of pulley.

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Sunday, February 19th, 2012 AT 10:13 PM
Tiny
EXOVCDS
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The water pump has a small "weep" hole. Coolant can leak from it
depending on engine temperatures & pressure.

It might not leak until the car has been run to fully warm state and
then as the engine cools, coolant will start to run out.

Attached is a picture that shows a trail of coolant from the pump
town to the crankshaft sprocket.

Diesel engine picture. But your w/p is in the same place.

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Sunday, February 19th, 2012 AT 10:46 PM
Tiny
EXOVCDS
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One more.

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Sunday, February 19th, 2012 AT 10:51 PM
Tiny
TYAZZ
  • MEMBER

Thanks. This leak though leaks weather the car is running or not. Its a slow drip with the car off, and a very fast drip with it running. So fast that the coolant resevior will empty out in ten minutes.
Regardless, im going to have it diagnosed to know for sure.

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Monday, February 20th, 2012 AT 1:17 AM
Tiny
EXOVCDS
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Yes, have it looked at and post back your finding!

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Monday, February 20th, 2012 AT 1:20 AM
Tiny
RIVERMIKERAT
  • MEMBER

For about $12 you can buy a one month subscription to the same reference material we use here.
http://www.2carpros.com/articles/mitchell1eautorepair-car-repair-manuals

Or, you can go to Autozone, Pep Boys, or one like them and buy a Chilton's or Haynes manual and do the work yourself. And tools you need can be rented or borrowed from the same stores. You can save more than $100 doing it yourself.

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Tuesday, February 21st, 2012 AT 2:51 AM
Tiny
TYAZZ
  • MEMBER

It was the water pump leaking. If I could do it myself it woulda cost $170 for water pump, thermostat, and timing stuff. Since I couldn't, $700. Thanks for the help guys. Ima get to posting my next problem with this car.

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Thursday, March 1st, 2012 AT 11:33 AM
Tiny
RIVERMIKERAT
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Glad we were able to be of help. Glad it's fixed now.

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Friday, March 2nd, 2012 AT 4:57 AM

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