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Discussion Starter #1
I saw in the FAQs something about coolant migration. I think I get the idea (coolant sloshes in the tank, gets up into the connection for the sensor, then seems along the wires throughout the car). I met someone with an 06 golf who's coolant tank has the sensor coming out nearly horizontal (parallel to the ground). He has poked a small hole right near the sensor connection to let it drain (without puncturing the tank). I looked at mine (2005 jetta wagon), thinking I'd do the same. However, my tank has the sensor coming out at a nearly 45-60 degree angle to the ground. I am wondering if anyone knows much about the differences between these cars (I thought that the 06 golf and 05 jetta were actually very similar - BEW and all) so I was surprised that this would be different. Do you think that coolant migration would be an issue in my car without poking the hole?
 

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I thought the horizontal one was the one that leaked? It's not about sloshing coolant, it's about a defective coolant tank that lets liquid past the seals and into the wiring.
 

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I thought the horizontal one was the one that leaked? It's not about sloshing coolant, it's about a defective coolant tank that lets liquid past the seals and into the wiring.
I would suspect that the horizontal one would be more prone to this than the angled one. I guess I was just surprised that mine had an angled one, yet was a year older.
 

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Check for coolant migration first. If it's dry then poke a hole in the plastic to let any pressure leak out there as shown in the FAQ section. I don't know why but there was a mix of parts so it can affect up to 06. Even though the Audi/VW Passat coolant tank is a completely different design, it also can get coolant migration. It's partly VW's fault and partly the parts supplier fault.
 

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I believed this was fixed after 2002..........I experienced it in my 2002 Jetta was not a pleasant experience.........:(
 

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Unfortunately I don't think it was fixed after 2002 - either that or it's more rare. Some mk5 had the old style tanks but I'm not sure if they really did fix it or if they were just using up old tanks they had lying around. Some Audi/VW coolant tanks got it too and that's with a completely different tank design. In any case it's a pretty rare problem but if it does happen it could total the car.
 

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It's really sad that a car can be trashed by a little bit of coolant. Whoever supplies VW's coolant tanks should be penalized by VW and VW should have extended warrantys for those who have had coolant migration. I've never even heard of anything like this before.
 

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There is no reason not to take the simple preventive measure -- with a paper clip and a BIC lighter, it takes less than 60 seconds.
 
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