Replaced coolant flange, coolant temp sensor.

Tiny
LOUSIMPSON
  • 2000 VOLKSWAGEN JETTA
  • 10,500 MILES

Replaced coolant flange, coolant temp sensor, and thermostat. Drove fine for a few days, now car overheating, coolant leak under passenger side, no heat coming out of vent. What should I check next? 2000 vw jetta

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Wednesday, October 24th, 2012 AT 7:37 PM

11 Replies

Tiny
DR. HAGERTY
  • EXPERT
  • 9,737 POSTS

I would start with finding the leak. Top off the cooling system and apply some pressure to it.

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Wednesday, October 24th, 2012 AT 7:41 PM
Tiny
EXOVCDS
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Water pump impeller is broken, replace water pump and timing belt kit..

http://www.youtube.com/watch?v=WJlS7MvfRXo&feature=plcp

Thomas

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Wednesday, October 24th, 2012 AT 8:31 PM
Tiny
EXOVCDS
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2.0L timing belt removal video:

http://www.youtube.com/watch?v=4N3QpRgvYsQ&feature=plcp

Thomas

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Wednesday, October 24th, 2012 AT 8:33 PM
Tiny
DR. HAGERTY
  • EXPERT
  • 9,737 POSTS

I guess your crystal ball sees things that mine doesn't

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Wednesday, October 24th, 2012 AT 8:39 PM
Tiny
EXOVCDS
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I know VW & Audi. That's why I only post in the VW & Audi section.

Thomas

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Wednesday, October 24th, 2012 AT 8:42 PM
Tiny
EXOVCDS
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Quick way to confirm water pump flow or lack of flow:

http://www.youtube.com/watch?v=thcwatH_BpI

This is me being helpful... not advertising my youtube channel.

Thomas

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Wednesday, October 24th, 2012 AT 8:44 PM
Tiny
LOUSIMPSON
  • MEMBER

Thanks everybody for your responses. Thomas, I tried the water pump test in your video and I got no flow until I hit the accelerator. That seems to be the problem.

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Thursday, October 25th, 2012 AT 12:51 AM
Tiny
EXOVCDS
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Hi, have you had a chance to see where the leak is? Passenger side of engine would be the water pump. Leak
would be dripping from under the crankshaft pulley. It is a 2 liter engine, yes?

If the leak is behind the engine (towards the firewall), then the leak is either a heater core coolant hose flange
or the heater core itself (leaking out the A/C drain).

Thomas

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Thursday, October 25th, 2012 AT 1:57 AM
Tiny
LOUSIMPSON
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Good morning Thomas. After I replaced the thermostat, the only leak I see is on the passenger side but further back, almost like the fluid is traveling along a line then dripping. As I stated previously, I tried the water pump test from your video and that might be the problem. The car runs fine, but no heat from the vent and when I took it around the block last night, the engine temp went up quickly. The hose that leads to the thermostat is warm; could it be something else maybe?
I understand that replacing the water pump can be a bit of a job.

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Thursday, October 25th, 2012 AT 3:09 PM
Tiny
EXOVCDS
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No heat from vents is another verification that the pump is not circulating.

The upper hose always gets hot. The lower one will stay cool(er) when the pump does not circulate.

Thomas

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Thursday, October 25th, 2012 AT 3:18 PM

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