Another heater core?

Mcbee104

Member
Joined
Apr 5, 2021
Location
Usa ohio
TDI
2014 Passat tdi
Know someone here was changing their coolant annually to prevent heater core from clogging up but it still clogged up. Most of us have to deal with freezing temps in winter so increasing ratio of water to coolant isn't really a solution. You're in Michigan so I know you get the cold - I'm by the Indiana/Michigan line. I'd stick with 50-50 coolant.

A tune should take care of the clogging (or at least minimize the regens/clogging) from what I've read here. I'm just waiting for the extended emissions warranty to run out as it has come in handy for a couple of issues already.

Without a tune best advice is to avoid short trips if possible. Worst thing one can do is turn engine off in mid-regen. Best to have engine get up to normal operating temp and run it on the highway on a regular basis. I have a 70 mile round trip commute and can plan on when a regen occurs as I monitor my soot levels via Polar-FIS. I've found the regens are consistent and predictable with the CVCA which wasn't the case with the 2014 CKRA that I previously owned. I have another vehicle I use for short trips in town so I save my Passat for the commuting and long trips.

Wish these CVCA engines/emissions system were like the ALH cars but they're not. Life is too short to worry about this.

One other thing - if you start losing heat get the heater core changed soon as possible! Mine failed on a road trip. I was able to get to my destination but hardly any heat. Unfortunately it was 600 miles to home - made it a third of the way but due to the clogging the hot coolant got backed up on the inlet side of the radiator (clogging restricts the flow of coolant) which then melted a hole in a plastic fitting! Dealer #1 replaced fitting but did not change the heater core - said it would get me home which was not the case. Only got 175 miles down the road and another melted hole. Dealer #2 did same thing as #1 and again said it'd get me home. OK, 30 miles up the road - same thing again! Dealer #3 changed the fitting and the heater core - finally was able to get home. Yes, first two dealers just replaced the failed part (melted plastic fitting) without figuring out what caused that to happen which was the clogged heater core. So don't delay in replacing a failing heater core otherwise you're bound to have the experience I did.
How do I kno or find out when a regen occurs? I have a 2014 Passat tdi and just blew rod threw my blow. When I got to the side of the rode there was engine coolant all over my engine bay. My car is mostly used for short trips back n forth to work across town. But at this particular time I was on a long drive jumped on the highway from a back rode and was rappedly accelating up to high way speed and it blew a rod threw the block. The car has 60k miles on it now. But after reading this post I do remember towards the end of our winter here the heat just wasent getting as hott as it used to when I 1st got the car and it took longer for the heat to in the car to get hott. The car was at normal operating temp when I started the rapid acceleration
 

Tom in PT

Veteran Member
Joined
Jun 7, 2017
Location
Twilight Zone, WA State
TDI
2005 Passat sedan - SOLD; 2013 Passat DSG; both purchased new
If your engine just threw a rod you have a lot more issues to be concerned with than when regen occurs . . . . VW should supply you with a new engine if you had the Emissions fix done on your 2014. Read up on the extended warranty that came with the fix and call a local VW dealer to make arrangements.

To answer your question, unless you are monitoring exhaust gas temp. with an app on your phone, the way to know is to hear the cooling fans running when you are idling or after you shut off the engine. They will run for a few minutes after shut off. Lots of threads on this topic, do some searching and learn all about it.
 

06bluebeetletdi

Veteran Member
Joined
Sep 30, 2012
Location
Middlesex, NC
TDI
'14 Passat TDI SEL and '13 Beetle TDI
Be very careful with the polar fis, if the car every acts odd, ie won’t respond to the remote at all or won’t start, disconnect the polar fis immediately. My polar fis caused my car to loose all communications and stop moving as well as lighting up the dashboard. Luckily it did it where I could roll backward into the parking lot at work, the rest of my commute is highway at 55-70 mph and could have been catastrophic.
 

spepin

Member
Joined
Jan 14, 2020
Location
Corona, CA
TDI
2014 Passat TDI SEL Premium
Be very careful with the polar fis, if the car every acts odd, ie won’t respond to the remote at all or won’t start, disconnect the polar fis immediately. My polar fis caused my car to loose all communications and stop moving as well as lighting up the dashboard. Luckily it did it where I could roll backward into the parking lot at work, the rest of my commute is highway at 55-70 mph and could have been catastrophic.
Thanks for the caution -- is this a problem that was apparent right away, or did it do it one day out of the blue? Did you ever find out the cause? This is the only time I've heard of any problems with it.
 

06bluebeetletdi

Veteran Member
Joined
Sep 30, 2012
Location
Middlesex, NC
TDI
'14 Passat TDI SEL and '13 Beetle TDI
I had it about 18 months, first incident (acting strange with the key) was on a Saturday. Catastrophic failure was thursday of the next week. Scanned the car, several lost communication faults covering all major systems of the vehicle. Removed the polar fis and a friend and I drove it several times over the next 10 days with no issue, reconnected the polar, no start and no communication faults again. It’s been 10 months with no issues. Returned the polar to the company in Spain, never heard from them again, that was july 2020.
 

spepin

Member
Joined
Jan 14, 2020
Location
Corona, CA
TDI
2014 Passat TDI SEL Premium
I had it about 18 months, first incident (acting strange with the key) was on a Saturday. Catastrophic failure was thursday of the next week. Scanned the car, several lost communication faults covering all major systems of the vehicle. Removed the polar fis and a friend and I drove it several times over the next 10 days with no issue, reconnected the polar, no start and no communication faults again. It’s been 10 months with no issues. Returned the polar to the company in Spain, never heard from them again, that was july 2020.
Thanks for the head's-up...
 

spepin

Member
Joined
Jan 14, 2020
Location
Corona, CA
TDI
2014 Passat TDI SEL Premium
And it happened again. Dealer replaced my heater core at 55,300, and now, during a vacation trip, CEL came on again at 66,120. Checked codes and found that the dreaded P2457 is back, combined with no heat at the dash vents. Luckily it's warm weather, so no heat needed, and I'm on my way home with about 350 miles to go tomorrow. I'll contact the dealer and schedule a return visit. Luckily, this one will be under dealer repair warranty, so no deductible. On the first replacement, I noticed the WO showed "drain and refill" for the coolant, not a flush as the TSB dictates. I warned them at that time that the problem would probably reoccur, and here we are.
 

Tom in PT

Veteran Member
Joined
Jun 7, 2017
Location
Twilight Zone, WA State
TDI
2005 Passat sedan - SOLD; 2013 Passat DSG; both purchased new
You need a good flush (or preferably several) to get all the debris clogging the cooling system out of it, the dealer should know that. When mine clogged the VW dealer in Bremerton WA actually flushed it three times and since then (about 18,000 miles and 3 years) the system is working properly.
 

740GLE

Top Post Dawg
Joined
Aug 19, 2009
Location
NH
TDI
2015 Passat SEL, 2017 Alltrack SE; BB 2010 Sedan Man; 2012 Passat,
Amazing that 18K is worthy of bragging of longevity of the coolant system.

So glad VW bought back our 2012 in 2017 with 80K on the clock.
 

Tom in PT

Veteran Member
Joined
Jun 7, 2017
Location
Twilight Zone, WA State
TDI
2005 Passat sedan - SOLD; 2013 Passat DSG; both purchased new
^ Its so sad . . . . . Silly me, I stupidly had faith VW would honor its warranties and the the bugs were worked out after umpteen million miles/hours of testing before the fix was announced. My car only had 26,000 miles on it when the fix came out, so I thought - what could go wrong, the car is almost new, and they are paying me over $7,000 if I keep it, and fuel economy is only supposed to take a 1 mpg hit! [palm hits forehead]
 

spepin

Member
Joined
Jan 14, 2020
Location
Corona, CA
TDI
2014 Passat TDI SEL Premium
Dealer confirmed -- another heater core (initially they said it might be DPF since they had two other cars there same week with same codes need DPF). I reminded them that the last time it was done, the repair order only stated "drain & refill" for the coolant, and not flush, although the TSB states a proper flush is required, otherwise the problem will return. Service rep told me that when I inquired about it last time, the tech told her that he did the flush, but then she also told me that he's no longer working there (gee, I wonder why). She said the tech currently working on it is performing multiple flushes by the book. I also had a couple intermittent codes that correlate to issues that I've seen come and go -- there was a B108C code for intermittent left temperature flap (actuator stuck), and B1094 for the left position sensor (open or short to plus) that correlated to feeling the dash air go from cold to warm for 5-6 seconds, then back to cold. Another for intermittent short on the GPS antenna cable (007) that seems to correlate to intermittent drop-outs of my satellite radio (when not around buildings or something else that would block the signal). There was one more intermittent code (B1050) for a radio overtemp, but I attributed that to our recent drive through Arizona, New Mexico and Texas so didn't complain about that. However, the dealer seems to think that the antenna cable short code is related to overheating in the radio -- I told them to look at the time stamp of the freeze frame data when the problems occurred, and they'd see that the intermittent short did not occur anywhere near the time that the radio showed overtemp (4/9/21 vs 6/13/21). I don't see the two related.
 

klburton22

Member
Joined
Feb 13, 2020
Location
Lake Labish Oregon
TDI
2014 Passat TDI SEL Prem
I haven't looked at this thread in almost a year, it's been a very busy year for me. So just an update, I haven't had to replace a heater core this year which I am very happy about. The car has been running great, I have 103K miles on it. But this maybe the last month I own the car. I put a deposit down on a 2021 Toyota 4Runner and it should be in sometime this month, the plan is to trade in the Passat on the 4Runner. The Passat has been a good car but I've just haven't been able to fall in love with VW. Once I get the 4Runner, that will be my wife's car and I will be driving her Volvo XC70. I have been a Volvo guy for many years and probably always will be.
 

superdavis78

Member
Joined
Jul 31, 2021
Location
Corbin, KY
TDI
2015 VW Passat TDI SE
I’m struggling to get the pipes connected 🤦🏻‍♂️🤦🏻‍♂️ The removal and installation isn’t bad at all. Just can’t finish it up because the pipes won’t seat!!!
 
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