ian.f

Hi, From what I found when researching, if it’s just the core you need access/removal to, then it’s just the glove box (for rhd) or the steering column assembly/cover (for lhd). If you need access/removal, then it’s the whole dash out. My A4 had poor heat at front and no heat at the rear. With the new core I now have good heat from both. Yours does sound like it could be a flap/paddle issue. Do you have a Carista dongle by any chance? I do, and there’s a calibration check that can be done with Carista that will check and reset the flap/paddle positions.

The one I bought only came with the foam to wrap round the core. I did buy the additional fitting kit which had new clamps and O rings, but taking the old one off and inspecting the old kit, it was in good working order, so I didn’t need the new kit. The fitting kits can be bought on eBay, part number 4M0898037B

Ok, so finally I’ve fitted the new core. The old one was completely blocked. When blowing in to one side, nothing out of the other side. I rinsed it a few times and flushed it. Little blobs of some pink stuff came out. I’m guessing that’s the burst silica bag. With the new core in, the heat is much better, but it’s still not a patch on my wife’s gla. I guess it’s just not a hot motor! I bought two cores from AutoDoc, in case one was damaged like my first attempt. Means I have a spare. Listed here if anyone’s interested https://www.ebay.co.uk/itm/186917272022?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=wxS-jJ-HRf6&sssrc=0&ssuid=wxS-jJ-HRf6&var=&widget_ver=artemis&media=COPY

Hmmm good shout. So a bit of grease round the mouth on the core, then the o ring should slip in easier? I can’t see any specific connection/connector/locator, but will check tomorrow. if I take the o ring out, the pipe sits in flush to the core and I can fit the connector…but it leaks badly…obviously!

evening all, so I stripped mine down this weekend ready to install my new one…which was broken again 🤦‍♂️ putting it back together whilst I source another, I cannot for the life of me relocate the pipes in to the core. No amount of pushing will compress the washer enough that I can get the clips on. did anyone else struggle with this? Any tips greatly appreciated!!

Right, scratching my head now. So with a defective part received, I thought I’d dismantle it just to have a dry run. Took the car out to do the errands today and it was heating very well. I wouldn’t say hot, but certainly very warm. Still took it apart to see what’s going on. With the car running and temps showing 90degrees, both feeder pipes to the heater core were red hot. I couldn’t get to the whole core obviously, but the exposed metal parts were also red hot. So I have no idea what’s going on. The only thing I can think of is when the mechanic was investigating he inadvertently fixed it. I’m going to have the coolant changed this week, hasn’t been done in a couple of years, so I’ll put some flush in it and then get it changed. 🤷‍♂️

Looks like I won’t be sorting it out this weekend 🤦‍♂️

Thanks, that matches my part number also. From my side, yes. I hit 90 pretty quickly…dependant on ambient temps. Stays at 90 constantly. When I did a core flush 6mnths ago, all the pipes were hot enough to the touch as well.

Great shout! They had one 👍

Sweet, thanks. I’m going to flush the coolant as well. If the core is blocked or damaged by the coolant that’s in there (silica bag broken or whatever) then I don’t want the new one getting clogged up quickly. So I’ll flush it out and then change the core whilst the system is empty.

Yeah I’ve had the same with them. We’ll see. Just planning through the job and as far as I can see it’s: glove box out, blower motor out, side cover off, pipes undone, cover off, and then it’ll slide out. Was that your experience?

Sounds promising then; I’ll buy tonight. The number on your order (727210) is for OEM part number 8w0898037, which is the same number I found…so that’s good. Can’t seem to find one from the UK though, so Germany it is!! How long did yours take to arrive?

So I’ve just spoken to the garage. They’re not able to find anything specifically wrong. They advised that it’s probably a stuck thermostat, or the heater core. So I think I’m going to have a go at doing the heater core, as that’s where the majority of the issues seem to get resolved. Does anyone have the part number for the core please? I’d like to check before I buy a replacement and strip it all down! Thanks

Are they sure it’s the booster? Not heard of the booster itself going bad. Have you had the sensor changed? If not, try it yourself. It’s really simple if you can diy a bit. The sensors are about £20ish when I last checked. Am replacing mine again soon…it’s part of my yearly routine!!

Hi, Sorry for late reply. I haven’t solved my issue. Booked in at a mechanics on Dec 9th. I have some heat from front vents, and cold from back/rear-footwells. I’m thinking it’ll be the matrix, like you’ve all mentioned here. As soon as I’ve got it back, I’ll post here and update you. cheers

Concurring with the above posts. I’m astounded at Audi’s behaviour completely through the ownership of my A4. It cost me £16,000 in 2019. I’ve had so many issues with it, like this ABS issue, ECU failures, I think I’ve replaced every sensor under the bonnet, AdBlue sensor failure, etc, etc. I’ve spent £9k to date and I’m currently looking at another £1.2k on having to drop the gearbox out to disassemble it to get at, wait for it, another sensor! Audi have refused to acknowledge any inherent issues with the B9. All they say is “book it in for a diagnostic” then quote me crazy prices to fix things I can do myself or others can do at half the cost. This was my first Audi, and will be my last VAG vehicle.

Happy you’re sorted Mate. But jee-wizz, £336…daylight robbery. How are we still allowing Audi (and the likes) charge this?! When I did mine (20k post full replace of ABS unit) it took me 10 mins and cost me £20. Shocking from Audi…again. In case anyone wonders, I’m replacing mine every 20k now…not falling for that trap again!

Needs must indeed 😂 Theres a couple on Amazon with next day delivery; my advice would definitely to get one. If it can’t be done for any reason, please please don’t drive it until you can get one fitted. I made the mistake as several others did too…don’t be a statistic!

Sorry I wasn’t clear; I had the juddery brake pedal in mid-2020. After 100 or so miles not sorting it, the abs unit bricked. Had to have it replaced. I learned the hard way, so just lending my experience to others. I think this might be my thread actually 😂

Had this back in mid-2020…very unnerving and we didn’t know the fix back then. I kept driving it and it cost me bad. If I were you, I wouldn’t drive another mile. Get the part yourself and fit it yourself. It’s a doddle. Even if it’s booked in, still get the part. The garage may not have experience and not be able to fit it, or the part may not be available..yada yada yada. If you’re booked to do 1k from Friday, and it isn’t fixed, you’ll 100% need to replace the abs unit by the end of your trip.

Definitely get it sorted before driving any more. £30/40 to replace the sensor, or £x00s on sorting the abs unit. Not worth the risk for you.

My 2016 Avant is equally as confusing! It’s the new shape Sept2016 registered. So it’s the B9 officially. But my V5 says B8. The weightplate on the car says B8.5. Never had any issues getting parts or anything like that but that may be luck!!

I genuinely despair with Audi dealers. How and why would a new water pump be needed in this scenario? The process of draining down probably did release a clog in the heater core which fixed the issue slightly. But if the pipe in is hot, then it’s not a water supply issue. And why a new thermostat? Makes no sense at all. Audi dealer service shops are pretty useless these days I have to say. My local one is full of kids fresh out of college, who just follow Audi’s online fix process, rather than diagnose anything.

Interested to know the outcome here too please. I had the same issue. Flushed the core which helped a bit, but still not as it should be.

On the AdBlue topic, you can get the no restart message flashed out of the ECU at a fraction of the cost of replacement parts. Give Andy at https://ecuflash.co a call. On the wider get rid or keep topic, I’ll never buy another Audi again. 16 plate B9 (actually B8.5 according to it’s car plate). Owned for 5ish years and I’ve put 50k on it. 80k in total. I’ve spent about 7k keeping it on the road, fixing issues that shouldn’t be there for a car this age and mileage. Not including “on-the-road costs” like tyres. -Had the brake servo/abs issue. -Had the AdBlue issue. -Odometer failed and had to be replaced. -2 broken rear coil springs. -Have the issue with low interior heat. -5 (yes five) new sets of front discs/pads due to excessive warping. -1 new calliper. I can go on, but suffice to say my experience of “Vorsprung durch Technik” is actually “our technology is crap”.