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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 October 23rd, 2015, 21:45   #1
inthewoods
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Default TSB for clogged heater core / code P2457

Okay,

For all who are going through the clogged heater core issues take a look at the link for the Technical Service Bulletin regarding this issue:

https://drive.google.com/file/d/0Byx...1OVm1tNE0/view

Hopefully this will shed some light on the issue, and it looks like a simple PH test can be preformed to identify future issues. Also from what the Service Tech said the new heater core has be redesigned to allow for better flow reducing the chance of plugging.
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Old October 23rd, 2015, 21:51   #2
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first step in being covered by a extended warranty
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Old October 24th, 2015, 00:16   #3
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Quote:
Originally Posted by inthewoods View Post
Okay,

For all who are going through the clogged heater core issues take a look at the link for the Technical Service Bulletin regarding this issue:

https://drive.google.com/file/d/0Byx...pwenhkcjQ/view

Hopefully this will shed some light on the issue, and it looks like a simple PH test can be preformed to identify future issues. Also from what the Service Tech said the new heater core has be redesigned to allow for better flow reducing the chance of plugging.
Interesting that the TSB was released on July 17, 2015.

How low can 50/50 ratio go? In canada there was a tsb to flush coolant and replace with -45 mixed coolant for 2013-2014 models.
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Old October 24th, 2015, 08:32   #4
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Is the "flux" contaminant gone after this flush/fill, or will it continue to leach into the coolant and be an issue?
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Old October 24th, 2015, 12:09   #5
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Yes I too wonder if this is a fix or if it is a temporary fix. Clearly owners will have to be on top of changing the coolant if they want to maintain flow through the heater in the future. Either that or the new heater core is made differently.
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Old October 25th, 2015, 08:16   #6
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Having an out of warranty 2012 NMS, I'm curious why the 2012 isn't cited in the TSB.

Living in S. Florida, The heater isn't used much. I checked it yesterday and the passenger side is putting out as much heat as the driver's side.

Based on this forums numerous heater core posts of folks having clogged cores, I recon it wouldn't be a bad idea for a flush and refill of the cooling system.

The VW Maintenance schedule only calls for checking coolant every 40k, but does not mention replacement/flush.

I think i have some pH strips laying around somewhere. I'll try testing fresh vs used coolant to see if I can ascertain those numbers. If I'm successful I will post them.

Is there a good reference on how to perform a flush on this model, somewhere out there?
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Old October 25th, 2015, 20:46   #7
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Quote:
Living in S. Florida, The heater isn't used much. I checked it yesterday and the passenger side is putting out as much heat as the driver's side.
Just guessing, yet again, but wouldn't a stagnant core be more susceptible?
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Old October 25th, 2015, 22:13   #8
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HVAC system doesn't regulate flow of coolant through the heater core, it regulates the air flowing through it. AFAIK, coolant flow is a constant.
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Old October 26th, 2015, 09:12   #9
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Quote:
Originally Posted by MB2VW View Post
Having an out of warranty 2012 NMS, I'm curious why the 2012 isn't cited in the TSB.
There was an AC change from 2012 to 2013 iirc. My 12 SE has auto temp AC. That was changed and some physical changes. The AC air inlet is different and 13s i believe is when they brought rear AC vents. Perhaps a different heat core also accompanied these changes.
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Old October 26th, 2015, 10:15   #10
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Quote:
Originally Posted by MB2VW View Post
Having an out of warranty 2012 NMS, I'm curious why the 2012 isn't cited in the TSB.

Living in S. Florida, The heater isn't used much. I checked it yesterday and the passenger side is putting out as much heat as the driver's side.

Based on this forums numerous heater core posts of folks having clogged cores, I recon it wouldn't be a bad idea for a flush and refill of the cooling system.

The VW Maintenance schedule only calls for checking coolant every 40k, but does not mention replacement/flush.

I think i have some pH strips laying around somewhere. I'll try testing fresh vs used coolant to see if I can ascertain those numbers. If I'm successful I will post them.

Is there a good reference on how to perform a flush on this model, somewhere out there?
Perhaps there was a change in manufacturing or design of the radiator or another part of the cooling system between 2012 and 2013 that resulted in the excess flux.
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Old October 26th, 2015, 18:04   #11
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Anyone know what "proper" ph level actually means?
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Old October 26th, 2015, 18:26   #12
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Quote:
Originally Posted by Deezil_n_Dachs View Post
Anyone know what "proper" ph level actually means?
I'm going to assume the proper PH level can be determined by mixing up a fresh batch of 50/50, and testing it.
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Old October 27th, 2015, 20:00   #13
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After writing a letter to VW of America, they agreed to pay for our heater core replacement for a 24 month-old NMS Passat TDI (just out of warranty). My hand was strengthened by details learned about the cooling system issues on this site.
The loaner car is a new 2015 TDI--which of course can't be sold right now. I wonder how many dealers are putting their stuck TDI inventory to 'creative use'?
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Old October 28th, 2015, 07:56   #14
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my dealer has all the tdi's in the overflow lot 2 miles away from the dealer. All covered in dust and grime, weeds growing up past the bumpers. I would pick another one up it were in the low $20K range and 0%
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Old October 28th, 2015, 12:51   #15
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Quote:
Originally Posted by MyAvocation View Post
Flux usually localized, so oxidation would grow into a blockage, as opposed to free flowing. That's my guess.
Color me wrong, post deleted. Thanks to awesome R&R write-up we can now see contamination is free flowing: http://forums.tdiclub.com/showthread.php?t=450667
Kudos to 767Wrench.
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