HELP - heater core replacement

[Christie365]

Glad to hear you have heat again. With that core you bought, did you have to buy anything extra like the foam or o-rings? Or did it come with everything you needed for the job. 

[ian.f]

13 hours ago, Christie365 said:

Glad to hear you have heat again. With that core you bought, did you have to buy anything extra like the foam or o-rings? Or did it come with everything you needed for the job. 

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

[Ivan Drago]

Hi Guys, 

I am having the same heating issue on my 2018 A4 Allroad.

Can you help me with the exact location of the heater core at my car? 

There are some conflicting info on the web, some saying that complete dash must be removed.

My car is lefthand drive.

Many thanks,

Ivan

 

 

[Vytas]

14 hours ago, Ivan Drago said:

Hi Guys, 

I am having the same heating issue on my 2018 A4 Allroad.

Can you help me with the exact location of the heater core at my car? 

There are some conflicting info on the web, some saying that complete dash must be removed.

My car is lefthand drive.

Many thanks,

Ivan

 

 

Hi,

 

It`s behind the glove box towards the central console. If you remove the glove box you can see the pipes and the core, however, to remove it as someone said previously in this thread you will need to remove part of your heaterbox fan. Someone said it took around 2 hours to get it changed with lots of screws. I plan to change mine soon, maybe in a couple of weeks and I plan to take a few pictures of the steps and post them here.

[Ivan Drago]

3 hours ago, Vytas said:

Hi,

 

It`s behind the glove box towards the central console. If you remove the glove box you can see the pipes and the core, however, to remove it as someone said previously in this thread you will need to remove part of your heaterbox fan. Someone said it took around 2 hours to get it changed with lots of screws. I plan to change mine soon, maybe in a couple of weeks and I plan to take a few pictures of the steps and post them here.

Thanks, what is not clear to me(please see the photo) is this a UK glovebox removal. If so than on lefthand drive side I would need to approach it from the steering wheel side, right?

Another thing that don’t make sense is if the heater core is blocked then there won’t be any(or poor) heating in the front either. My heating at the front is great, on the back console and back footwell only cold air is coming out when in heating mode.

Could it be that some flap/servo motor that redirects cold/hot is stuck in cooling mode?

Btw, air conditioning works great, no problem there.

All the best!

 

[ian.f]

20 hours ago, Ivan Drago said:

Hi Guys, 

I am having the same heating issue on my 2018 A4 Allroad.

Can you help me with the exact location of the heater core at my car? 

There are some conflicting info on the web, some saying that complete dash must be removed.

My car is lefthand drive.

Many thanks,

Ivan

 

 

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. 

[Ivan Drago]

1 minute ago, ian.f said:

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. 

Hi Ian,

Thank for your suggestions. Yes I have Carista and I did a HVAC calibration, nothing changed.

On Thursday I will visit coding specialist who is certain that he can fix the issue.

I will keep you updated. 

 

[Vytas]

15 minutes ago, Ivan Drago said:

Hi Ian,

Thank for your suggestions. Yes I have Carista and I did a HVAC calibration, nothing changed.

On Thursday I will visit coding specialist who is certain that he can fix the issue.

I will keep you updated. 

 

Hi Ivan,

 

In your case, i would remove the steering column cover and measure the temp at the bottom of the heater core, as rear vents get the air from the bottom of the heater, at least if it is hot, then you will know for sure it`s not your heater core/matrix. As well have a look in your coolant expansion tank for any silica at the bottom, as that's what starts blocking the heater when it bursts.

[Ivan Drago]

14 minutes ago, Vytas said:

Hi Ivan,

 

In your case, i would remove the steering column cover and measure the temp at the bottom of the heater core, as rear vents get the air from the bottom of the heater, at least if it is hot, then you will know for sure it`s not your heater core/matrix. As well have a look in your coolant expansion tank for any silica at the bottom, as that's what starts blocking the heater when it bursts.

Thanks, I will look into that tomorrow. 

One more maybe important point, when set to “Sync” and “Auto” there is no blowing at the back and middle central front console at all. When I switch to manual and crank up the temperature it do blows hot from all the vents in the front, rear starts blowing but at outside temperature(or close to outside temp).