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    Thread: W12 Auxiliary (Supplemental) Radiator

    1. 05-08-2006 02:22 PM #1
      Has anyone had a radiator replaced. One of my secondary radiators is bad.
      P.S. over a grand to replace it.....

    2. 05-08-2006 02:39 PM #2
      I'm curious why your radiator was not covered under warranty. Was your vehicle in an accident? (I noticed you had a bad windshield too.)

      A handy number for all US Phaeton owners is Phaeton Customer Care at 1-877-Phaeton. (1-877-742-3866). Please note this is an 877 and not an 866 or 800 number. Dial one of those area codes and you'll think you dialed a 900 number...

      PC

    3. 05-08-2006 02:46 PM #3
      My car has 61k. When I called Phaeton care, I was told the radiator was covered by the bumper to bumper. Not the drivetrain.

    4. Member Paldi's Avatar
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      05-08-2006 03:08 PM #4
      Welcome to the Forum. It's probably the highest milage Phaeton W12 here. How do you like the car? [IMG]http://**********************/smile/emthup.gif[/IMG]

    5. 05-08-2006 08:48 PM #5
      I do have an extended warranty. The Phaeton has three radiators and the warranty company will only cover the main radiator. I have appealed to the warranty company and am awaiting a response. Other than the problems with the TPS I love this car.

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      05-09-2006 09:13 PM #6
      I wonder if you could tell us a little more about the problem? in what way is it "bad", is it leaking, and, if so, where from?
      I recently had to replace the radiator in my '91 Acura Legend because of a small but diffuse leak along 3/4 of the plastic header, where it's crimped onto the aluminum radiator matrix. By the way, the Acura radiator cost almost $400, so the price you got quoted (assuming a more complex/larger unit) is not so bad, by comparison.

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      05-09-2006 11:02 PM #7
      Quote, originally posted by Motorista »
      I recently had to replace the radiator in my '91 Acura Legend because of a small but diffuse leak along 3/4 of the plastic header, where it's crimped onto the aluminum radiator matrix. By the way, the Acura radiator cost almost $400, so the price you got quoted (assuming a more complex/larger unit) is not so bad, by comparison.

      Don't forget he's replacing a secondary radiator, not the main engine cooling radiator. I believe the secondary radiators (oil? transmission?) are quite small. But who knows what has to be removed to get to them? Could be quite labor intensive.
      Which radiator was it? How much were the materials and how much was the labor?

    8. Senior Member PanEuropean's Avatar
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      05-10-2006 02:04 PM #8
      Quote, originally posted by 5049 »
      Has anyone had a radiator replaced. One of my secondary radiators is bad.

      Yes - I had the secondary radiator (the one on the passenger side at the lower front) replaced about 6 months ago. It is not a particularly difficult job to do, however, it is easier to do the job if you remove the front right wheel well liner, as well as the front bumper cover.
      Once those two parts are off, the radiator is there in plain sight and easy to get at. It is a snap to replace it - just disconnect two hoses, and then remove a couple of bolts.
      Be sure to check your coolant level every day for a few days afterwards, until the cooling system 'burps' and the air bubble comes out. The technician can't force the car to 'burp' the air bubble out - so, you just watch for the coolant level in the round tank to drop by about an inch and a half, and when that happens, you top it up.
      Perhaps ask the technican to give you about 10 ounces of coolant to take home - you can then add it yourself, this will save you a trip back to the dealership.
      Michael

    9. 05-10-2006 06:10 PM #9
      Michael, your car doesn't have a ton of miles on it and I know you are a pretty meticulous person about service. Why did the radiator have to be replaced? Did it just leak or was there another reason? It is probably something that is specific to the W12 because of the configuration of the radiators I guess.
      Let us know.

    10. Senior Member PanEuropean's Avatar
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      05-11-2006 04:03 PM #10
      I'm not sure if the radiator just sprung a leak, or if it was some kind of delayed reaction (6 month delay) from the small front end accident I had the previous summer.
      It had a tiny leak, right in the middle of it, with no evidence of any external damage of any kind. Pictures of the leak are below.
      Michael

      Evidence of leak - Supplemental Radiator, W12 Engine


      Last edited by PanEuropean; 10-18-2012 at 02:46 AM.

    11. 05-13-2006 03:56 PM #11
      I has the same situation with my car. I had a little incident with a curb last year. VW replaced the oil pan and the plastic shrouds under the car. Now this radiator problem has occured. Maybe we have a common problem here.

    12. Senior Member PanEuropean's Avatar
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      05-14-2006 06:19 PM #12
      I think this small radiator is quite well protected from impact damage, because it is well behind the front bumper cover, and the parts of the air shroud that fit up against it are soft and flexible. I noticed that there had been a part number increment (from B to C) when mine was replaced, and that the construction of the C version was slightly different. Whether this is significant or not - meaning, whether it was changed to fix a problem, or just changed as part of ongoing manufacturing process improvements - I don't know.
      Just a reminder to all that this small radiator is only fitted on the W12 engine, not on the V8 engine.
      Michael
      Small Radiator Replacement








      Last edited by PanEuropean; 10-06-2012 at 07:40 PM.

    13. 05-26-2006 10:18 PM #13
      I got my Phaeton back after a three week stay at the dealership. I had the supplemental radiator, water pump and thermostat replaced. The cost of the service was a few bills less then 3K. I made a call to Phaeton Care about the water pump. The pump should be covered by the 60K warranty. The radiator will have to go to arbitration and have a third party define "Radiator" vs "Supplemental Radiator". Has anyone had any of the problems I am having?? Ill keep you posted on what I find out.

    14. 05-26-2006 11:33 PM #14
      My W12 is in the shop right now for this very reason. I suspect this thread will become more and more bumped up in the future for us W12 owners.

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      05-27-2006 01:18 AM #15
      It is interesing that you received a "C" version replacement radiator a few months ago.
      As you can see in my recent http://forums.vwvortex.com/zer...42204 maintenance report, this week I received a "B" replacement radiator. According to the no-charge invoice I received, they replaced part:
      3D0-121-212-B


      Modified by Itzmann at 10:19 PM 5-26-2006
      SOLD. Our Premiere Edition Phaeton 2004 with 57,500 miles and with Extended Warranty thru year-end 2014 has been sold.
      Thank you all who were interested.

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      05-27-2006 08:26 AM #16
      Quote, originally posted by Itzmann »
      It is interesing that you received a "C" version replacement radiator a few months ago.
      As you can see in my recent http://forums.vwvortex.com/zer...42204 maintenance report, this week I received a "B" replacement radiator. According to the no-charge invoice I received, they replaced part:
      3D0-121-212-B

      Does the invoice indicate the part they replaced (3D0-121-212-B) and the part number they installed? Could it have been replaced by a 3D0-121-212-C?

    17. 05-27-2006 01:27 PM #17
      Now I look under the right front end of the car every time I pull out of the garage to see if there is any evidence of a leak! I assume if it is that small, the car probably has to sit in the same place for at least a week to see any coolant that has come out. At least the trunk is big enough to hold a coolant container in case I have to top it off on the road! I don't feel too bad about that though because when I had my old Jaguar I had to keep an extra fan belt, trans fluid, coolant, and 2 quarts of oil in the trunk whenever I took a road trip!

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      05-30-2006 03:24 PM #18
      Apparently, the invoices I receive from this dealer (with all values at $0 b/c VW takes care of them), list the part that was purchased, not the part that was, presumably, thrown away.
      Therefore, I would have received a "B" radiator last week.
      SOLD. Our Premiere Edition Phaeton 2004 with 57,500 miles and with Extended Warranty thru year-end 2014 has been sold.
      Thank you all who were interested.

    19. 05-30-2006 05:10 PM #19
      Mine was replaced aswell under warranty - will check to see if I have down why it needer replacement.

    20. Senior Member PanEuropean's Avatar
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      05-31-2006 10:04 AM #20
      If you were given a B radiator, then you can be certain that the changes made to the design that resulted in the C version were only improvements in the production (manufacturing) process, and not changes that were made to address any flaw in the design or functionality of the B version.


      Volkswagen - across the board, worldwide - is very good about pulling stock from the warehouses and not shipping it if the part number supercession signifies a 'problem fix' for a part.

      Below is a picture I forgot to add when I made the post above - it shows the process of pressure-testing the cooling system after replacing the supplemental radiator, to make sure that there are no leaks in the system.
      Michael

      Pressure Testing the System after Replacing the Supplemental Radiator
      Last edited by PanEuropean; 10-18-2012 at 02:52 AM.

    21. Senior Member PanEuropean's Avatar
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      05-31-2006 10:12 AM #21
      Archival Note -
      Related post: "Insufficient Coolant" Advisory Message.
      Michael

    22. 05-04-2007 11:26 AM #22
      After leaving my car parked for 2 weeks, I too found a small puddle of coolant under my car (about an amount equal to a spilled can of soda).
      It caused me to re-read the posts about the auxiliary radiator replacements on the W12's. The only thing is, I never saw the message on my screen that said the "coolant was low", as has been described on these posts. I have only 31,000 miles on the car so I am not due for service for a while. I guess I'll check the coolant level visually. I am wondering whether to just keep topping it off as is needed or whether the leak can get to the point of causeing the unit to fail and then have a major problem? Will the main radiator keep working or does the coolant actually circulate between the two and a leak in one will cause loss of all the coolant eventually?

    23. Senior Member PanEuropean's Avatar
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      05-04-2007 11:42 PM #23
      Jay:
      As best I can recall, the amount of coolant that exists between the 'minimum' and 'maximum' fill levels is greater than what a can of soda would contain (even allowing for coolant expansion), which is probably why you have not seen a "Low Coolant" message. If the temperature was getting colder (going down below freezing), you might see the message as the coolant shrinks, but that is not the case at this time of year.
      Perhaps ask your VW tech to have a close look at the cooling system next time you bring the car in for service. There are a few 'hidden' components - for example, the supplemental expansion tank that is directly aft of the main (spherical) expansion tank, in the cabin air intake plenum, and of course the auxiliary radiator.
      When an oil change is done on a W12, it's generally good practice to remove the front right wheel and the front right wheel well liner. That is really the only way to get access to the oil filter without deforming all sorts of stuff. When that front right wheel well liner has been removed, it is then possible to carefully inspect the back side of the supplemental radiator for evidence of leaking. If there is any leak, there will be pink stains on the back side of the radiator - they are easy to spot, provided you have removed that wheel well liner. There are some good photos of all of the parts that I have referred to at this post: "Insufficient Coolant" Advisory Message.
      Lastly - when the oil is changed on a W12 engine, it needs to be drained - it is not acceptable to suction the oil out, as is the practice with other engines. The Phaeton repair manual is quite explicit about this.
      Michael

    24. 05-05-2007 01:01 PM #24
      Thanks for your quick response. I'm not scheduled for an oil change for several months so I better keep some coolant handy and monitor that the leak doesn't get worse.
      Since my service is done at Autobarn Evanston I feel they should be quite well informed about the various procedures due to the large volume (relatively speaking) of Phaetons they service. To be on the safe side though, I will point out those things to them.
      Thanks again.
      Jay

    25. Senior Member PanEuropean's Avatar
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      04-21-2008 03:26 AM #25
      Photos re-hosted.

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