ThatLadOnTheSpanners

5 minutes ago, Magnet said:

Hello Nathan,

18 inch were probably an option, and I guess you know you will need to fit lower profile tyres than your current profiles on the 17 inch, to ensure the ‘rolling’ outside diameter remains the same. It would be worth checking in your handbook or tyre pressure sticker on the car, what the correct tyre size should be. I cannot see why any computer adjustments would then be necessary. 
Kind regards,

Gareth. 

Thanks Gareth.

I’ve gone for a lower sidewall size so in theory they should be the same rolling radius. 
 

Many thanks

Nath 

Hey guys!
 

I’m changing the wheels on my A4 from 17 inch to 18 inch wheels. Do I need to change anything via vagcom? 
 

many thanks 

Nath

Hi Gareth.

I only suggested this as I know 100% that on LR’s this is the exact case and the exact symptoms and these also show no other faults with the heating system. 
 

I understand that this being a different make of vehicle that it may be completely different but I’ve had to start with one theory and as Steve has now suggested I will have to go along other routes via VCDS.

Thanks

Nathan

Hey Gareth!

Thanks for replying! One of the reasons for suspecting a partially blocked matrix is by trade I work on modern Land Rovers (Discovery 3 and newer) and they suffer from the exact same symptoms and thats down to a matrix issue.

I may be leading myself down a completely incorrect path though. I presume I should be able to see any Blend Motor issues via VagCom by looking at dynamic read outs? 
 

Many thanks

Nathan

Hey guys!

My 2015 A4’s heater is poor on the drivers side (roasting on the passengers side) so I suspect a partially blocked/blocking matrix.

So, how much of a pig is it to change the matrix? Dash out or partial strip down? I’ve tried searching within the forum but can’t find anything.

any help or tips much appreciated!

Taaa 👍