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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW Passat Family (NMS and B7) TDIs (2012+)

VW Passat Family (NMS and B7) TDIs (2012+) Discussion area for the 2012+ Passat TDI (North American and rest of world versions versions). The North American model was previously codenamed NMS (New Midsize Sedan) and the version the rest of the world gets is sometimes referred to as B7.

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Old June 15th, 2019, 16:29   #1
ryanmonahan
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Angry 2015 Passat TDI 2.0 DSG Overheat and died

For the last year my Passat has been losing about a cup of coolant each month. Dealer couldnít find any leaks.
Today I topped it up and drove about 40km on Hwy and suddenly temp went way high. Pulled over and took a look coolant level was fine. I was right at an exit so I started back up to get off hwy.
Almost immediately it started beeping and lost power. Had to pull over as it stalled out. Got it towed to dealership.
When I first looked a bit of white smoke was drifting out from under the engine cowl. couldnt see any other obvious signs of trouble.
Iím at 95,000km
In Canada.
Any ideas? Hopefully warranty still good.
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Old June 15th, 2019, 20:33   #2
Tom in PT
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I'm pretty sure the 2015 Passat came with a 5 year, 60,000 mile (= 96,560 km) powertrain warranty, whichever occurs first. You should confirm that.

Unless you have done something that could give rise to a denial of warranty (like install an aftermarket performance chip , or fail to maintain it per the maintenance schedule), at first glance the warranty should cover repair or replacement of your overheated engine. If your "95,000" miles is approximate you need to be more precise as you are very close to the mileage limit.
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Old June 16th, 2019, 09:38   #3
thundershorts
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sounds like the water pump impeller spun on shaft.
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Old June 18th, 2019, 07:53   #4
740GLE
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Def thinking water pump as well.
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Old June 19th, 2019, 18:08   #5
ryanmonahan
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Thanks folks... itís been sitting at the dealer now for 3 days and I havenít heard a thing. Iíll go in there tomorrow morning to see whatís up. It should be warranty. The only issue I can see is that I canít find my last oil change receipt and it wasnít dealer... they charge $170.
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Old June 20th, 2019, 02:53   #6
Matt927
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They can not deny you a warranty claim because of that.
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Old June 20th, 2019, 08:55   #7
740GLE
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Quote:
Originally Posted by Matt927 View Post
They can not deny you a warranty claim because of that.

they can most certainly try
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Old June 20th, 2019, 09:57   #8
ryanmonahan
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So I stopped at the dealer just now. Didn’t see my car but the service rep
Had some pics. Tensioner on the timing belt seized and belt burnt up. That was the problem that led to overheating. Report is sent in to VW Canada for them to decide if they just do timing job or if they rebuild engine to avoid hassles later if related damage happened when belt broke. Rep says dealer recommends engine rebuild but ultimate call on warranty issues is up VW Canada cause they foot the bill. Anyone have any insight on this?
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Old June 20th, 2019, 10:06   #9
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You will want a new engine. A "rebuild" at the dealer level will result in something you will probably not like. This sounds like a really strange thing, but I guess it could happen. I do not see how a seized timing belt tensioner could cause the engine to overheat. All I could see happening is it rubbing through the belt to a point it failed, then the car just stops, but it would have been at normal temps right up until then.

Now what seems MUCH more plausible, is that the WATER PUMP seized, and since it runs off the smooth side of the timing belt on that engine, it would not have ripped the teeth right off the belt. And THAT would certainly have caused the engine to continue to run, so long as the belt was not yet rubbed through, and get hotter and hotter until either the belt broke and tooefed the engine, or the temp got too hot and tooefed the engine.

Either way, engine is likely beyond reasonable repair. Besides, the cost of the long block will be less than the cost of all the parts and labor to try and fix one. Current list price for a CVCA long bock, 04L-100-033-DX is about 4 grand. That is CHEAP. Valve over to oil pan.
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Last edited by oilhammer; June 20th, 2019 at 10:12.
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Old June 20th, 2019, 10:57   #10
ryanmonahan
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Awesome thanks for your advice. I will be talking to them about this.


Quote:
Originally Posted by oilhammer View Post
You will want a new engine. A "rebuild" at the dealer level will result in something you will probably not like. This sounds like a really strange thing, but I guess it could happen. I do not see how a seized timing belt tensioner could cause the engine to overheat. All I could see happening is it rubbing through the belt to a point it failed, then the car just stops, but it would have been at normal temps right up until then.

Now what seems MUCH more plausible, is that the WATER PUMP seized, and since it runs off the smooth side of the timing belt on that engine, it would not have ripped the teeth right off the belt. And THAT would certainly have caused the engine to continue to run, so long as the belt was not yet rubbed through, and get hotter and hotter until either the belt broke and tooefed the engine, or the temp got too hot and tooefed the engine.

Either way, engine is likely beyond reasonable repair. Besides, the cost of the long block will be less than the cost of all the parts and labor to try and fix one. Current list price for a CVCA long bock, 04L-100-033-DX is about 4 grand. That is CHEAP. Valve over to oil pan.
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Old June 20th, 2019, 11:43   #11
thundershorts
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Wonder if the design of running the wp off the smooth side of belt was to not break the timing belt in the event that happened?
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Old June 20th, 2019, 11:56   #12
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Possibly, and we see how bad the 2015's variable displacement water pumps already are, LOL.
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Old June 21st, 2019, 04:51   #13
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When VW replaces the variable wp under warranty is it replaced with a non variable or is that possible?
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Old June 21st, 2019, 05:07   #14
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I have been told the new replacement ones do not have the collar on them, but the electrical plug is still there. Since there is no feedback for the position, I guess the ECU doesn't care. You'd think there would be some coolant temp monitoring, and if it was flowing 100% all the time it might cause some coolant under temp problems, but I guess that situation doesn't happen or the engines just run so hot anyway that the use of the system is worthless anyway unless you live in Antarctica.

The later VR6s in the T'regs have variable pumps too, but they are vacuum controlled (duty cycled solenoid on the front of the engine) but I have never seen any problems with their collars coming loose.

I suppose the next step will be an electric pump, like the later Prius uses, that costs $700 and randomly without warning dies and tooefs the whole engine just the same.
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Old June 24th, 2019, 09:35   #15
740GLE
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Quote:
Originally Posted by oilhammer View Post
Now what seems MUCH more plausible, is that the WATER PUMP seized, and since it runs off the smooth side of the timing belt on that engine, it would not have ripped the teeth right off the belt. And THAT would certainly have caused the engine to continue to run, so long as the belt was not yet rubbed through, and get hotter and hotter until either the belt broke and tooefed the engine, or the temp got too hot and tooefed the engine.

This. It's the chicken or the egg, and it seems VW never thinks it's the egg to blame.

Hopefully this water pump of the '15 isn't the balanced shaft of the B5 or the cam wear of the PD.
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