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Discussion Starter #1
I've got a 2014 NMS, 1.8T, 133,000 miles. My heater core went bad, which I can accept. I even realize that with the recall VW had on this issue, I'm past the mileage, so I have no problem paying for a new one out-pf pocket. However, what's VERY puzzling and frustrating is that my dealership has replaced 2 heater cores in the past month and the same problem (no heat on the passenger side) recurs within minutes of their "test drive" after installation. They keep flushing my cooling system and it's now so clean that it's probably crystal clear, but the best thay have been able to do is get very nominal heat on that side while the driver's side gets as hot as Calcutta. The service advisor says this is one of the worst cases of this issue he's ever seen. This makes no sense to me. I asked him: Is there some aftermarket brand of heater core that will fit this generation of Passat that won't have these problems? He says no, but has anyone else had to deal with this?
 

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If the new heater cores have flow before installation, they are not the problem. You can confirm this if both inlet and outlet hoses are HOT when the engine is at normal running temp.
Could be air in the system, but this should give you weird indications on engine running temp.
Otherwise, possibly a problem with the heater blend door .
 

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Discussion Starter #3
He swears it's not the blend door. I did buy the car at 82,000 miles and noticed weak heat on the right as far back as the low 100K mark, but didn't think much of it until this winter, 33K miles later ,as my right side now doesn't completely defrost if it's really cold outside. What I have to wonder is if either A) I have so many air pockets from waiting too long to replace the core that it'll never be normal again, or B) the "revised" Passat heater cores still suck. ?????
 

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I have the same problem right now. I have read that there is a resister in the duct work that registers the temperature. One of these was bad in the youtube video. I'm digging into tomorrow.
Also heard that the actuators can cause this problem, Where the actuator for the cool to warm air in the duct work stops working on one side.
 

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I have the same problem right now. I have read that there is a resister in the duct work that registers the temperature. One of these was bad in the youtube video. I'm digging into tomorrow.
Also heard that the actuators can cause this problem, Where the actuator for the cool to warm air in the duct work stops working on one side.
 

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I had this issue on my 2013 TDI-SEL back in 2016, or there about. I drained and refilled it several times with minimal results.
About that time VW came up with a fix on warranty. Not sure what my mileage was at the time, probably around 60,000. I took it to Hendrick VW in Concord NC for the fix. Still was working fine when I sold it back to VW with 99,920 mi on it. Great car!
It was the heater core. I think the they made an improvement on the new cores.
I now have a 2015 TDI-SEL with 61,000 (has EPA mod)that I bought new in 2017. No problems with anything on it. And it gets better mpg than 2013 did.
 

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Discussion Starter #8
After 3 new heater cores, VW approved of me getting an entire new heating system (radiator, hoses, etc.) and now it works fine. If, within 12 months the heat going bad on the passenger side recurs, they will look into a new ENGINE that could have gunk in the block that's shortenting the life of my heater cores. Despite many negative posts all over the place for years about poor VW dealership service, my local dealership (and VW Corporate) treats me very well! $750 for all the stuff above is what I consider quite a deal.
 
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