Mechanics

FAST COOLANT LEAK FROM BEHIND PULLEY

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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TyAzz
February 18, 2012.




Probably the timing cover gasket or water pump.


Merlin2021
Feb 18, 2012.
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.


Tiny
Exovcds
Feb 19, 2012.
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?


Tiny
TyAzz
Feb 19, 2012.
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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Tiny
Exovcds
Feb 19, 2012.
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?


Tiny
TyAzz
Feb 19, 2012.
And yes thats what the car looks like.


Tiny
TyAzz
Feb 19, 2012.
Sorry about the late reply. Had a phone call.

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


Tiny
Exovcds
Feb 19, 2012.
Don't buy any parts until you have someone verify where the leak
is coming from!


Tiny
Exovcds
Feb 19, 2012.
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.


Tiny
TyAzz
Feb 19, 2012.
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.


Tiny
Exovcds
Feb 19, 2012.

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