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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old March 22nd, 2018, 14:12   #16
UhOh
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Although it's a bit dangerous, sometimes you have to run the drivetrain to discern where the noise is coming from. Put the car up on jack stands and run it in gear (5th if a manual). I wasn't sure about a bad wheel bearing until I did this: it was then VERY obvious.
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Old April 14th, 2018, 13:07   #17
flashmayo
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Update on these issues.
The thermometer light on the dash stopped lighting up after I scraped the leads in the coolant bottle with a screwdriver. I did notice tiny amounts of black stuff in the bottle. I hope that's not indicative of oil migrating into the coolant. Will keep an eye on it.
To try to locate the noise in the front end I put it on jack stands and ran it. This was inconclusive. The engine is too loud or the noise is too quiet. I made another observation about this noise while driving. I hear it more pronounced in a sweeping right turn as mentioned earlier, but I also notice it if I'm going straight and hit a dip in the road. This isn't an abrupt bump, but more like a dip that causes the front ent to get loaded as the road surface comes back up on the far side of the dip.
Puff of smoke at startup is still there. I'd like to figure out what that is.
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Old April 15th, 2018, 20:03   #18
wonneber
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I scraped my coolant pins a few years ago.
Been OK so far.
Funny part, before I scraped them if I drove from the back to the front (1 minute running time) shut the car to run inside for something when I started it again no light.
Seems to happen in colder weather.
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Old April 16th, 2018, 08:50   #19
Genesis
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Yeah that's expected behavior -- it's not "colder weather" per-se, it's that electrochemical processes (e.g. conductivity, etc) are thermally-sensitive, so as soon as the coolant warms up it's more likely to read "present" as the resistance between the probes falls enough for it to be considered "valid."
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Old April 18th, 2018, 18:55   #20
wonneber
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Quote:
Originally Posted by Genesis View Post
Yeah that's expected behavior -- it's not "colder weather" per-se, it's that electrochemical processes (e.g. conductivity, etc) are thermally-sensitive, so as soon as the coolant warms up it's more likely to read "present" as the resistance between the probes falls enough for it to be considered "valid."
I guess my coolant heaters are still working then. This is all of 2 to 3 minutes running time.
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Old April 18th, 2018, 19:56   #21
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Maybe not. You'd be surprised at how much the coolant warms up in a couple of minutes
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