Fast Coolant Leak

Tiny
TYAZZ
  • MEMBER
  • 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

48 Replies

Tiny
MERLIN2021
  • EXPERT
Probably the water pump here is a guide to help confirm the pump and a step by step guide with diagrams below to show you on your car.

https://www.2carpros.com/articles/car-is-leaking-coolant

and

https://www.2carpros.com/articles/water-pump-replacement

Image Reference:

1. To upper radiator
2. 0-ring (Always replace)
3. Coolant pump
4. Clip
5. Engine Coolant Temperature (ECT) Sensor (G62), with ECT Sensor (G2)
6. From expansion tank
7. Connector flange
8. To heater core
9. From expansion tank (vehicles with automatic transmission)
10. 10 Nm (7 ft lb)
11. Bracket
12. From heater core
13. From expansion tank (manual trans.) or ATF cooler (automatic trans.)
14. Coolant pipe
15. Oil cooler
16. To lower radiator
17. 20 Nm (15 ft lb) plus /14 turn (90 ) Always replace
18. Generator (GEN) bracket
19. 30 Nm (22 ft lb)
20. Poly-ribbed belt

Check out the diagrams (Below). Please let us know what you find.
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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
  • MEMBER
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
  • MEMBER
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
  • MEMBER
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
  • MEMBER
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
  • MEMBER
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
  • MEMBER
Yes, have it looked at and post back your finding!
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Monday, February 20th, 2012 AT 1:20 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
  • MEMBER
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
Tiny
99VWJETTA
  • MEMBER
  • 1999 VOLKSWAGEN JETTA
  • 4 CYL
  • FWD
  • MANUAL
  • 13,000 MILES
I have a 99 VW Jetta it has a lot of miles on it. I've noticed that coolant has been leaking from the car. Once the car is on and driving the coolant leaks like never before but once the car is off it will just drip for a little while then stop and over night the coolant will not leak but once the car has been on for a while it will not hold any coolant. Im wondering if this is a possible head gasket problem or hopefully something simple like a hose? Please help
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Sunday, October 7th, 2018 AT 7:09 PM (Merged)
Tiny
VWTECH83
  • MEMBER
The easiest thing to do is use a coolant pressure tester and pressurize the cooling system. While under pressure coolant or water will leak from the hose or flange. If no leaks found you can buy a head gasket tester kit. But while under pressure just look from where coolant is leaking.
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Sunday, October 7th, 2018 AT 7:09 PM (Merged)
Tiny
ANGELOR22
  • MEMBER
  • 1999 VOLKSWAGEN JETTA
  • 123,000 MILES
I have a 1999 jetta with the vr6 engine. It has about 123,000 miles on the car since purchased from a private dealership. A little after two weeks I my car starts to smoke from inside the engine bay. So I pull off to the side and hear this loud thump as more smoke comes out. My coolant cap had been pushed out because of the pressure I'm guessing. I refill with water and some coolant but still have not done a coolant flush yet. I still get the overflow in coolant expansion tank.
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Sunday, October 7th, 2018 AT 7:09 PM (Merged)
Tiny
CARADIODOC
  • EXPERT
What you're describing sounds typical of a leaking cylinder head gasket. Your mechanic can do a chemical test at the radiator to verify that or rule it out.
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Sunday, October 7th, 2018 AT 7:09 PM (Merged)
Tiny
OWENCAIN
  • MEMBER
  • 1999 VOLKSWAGEN JETTA
  • 230,000 MILES
I am interested in purchasing a 1999 volkswagen jetta from a seller on kijiji, but they told me that the car was parked in the garage over the winter and said there was a small amount of coolant on the ground and that they believed it was online a dried or cracked line. I asked them to take a better look at it and they told me they werent able to identify where exactly the leak was coming from but said it hadnt leaked very much over the past week. Could you give me some insight as to what is happening and what my best/worst case scenarios would be?
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Sunday, October 7th, 2018 AT 7:09 PM (Merged)

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