Hi all, I'm trying to find out if my coolant expansion tank contains infamous silicat bag and can't seem to find anything on here or even Google search. From my search I've figured out that tank in my car has part number 5WA121407F. All I was able to find was that round type expansion tanks did contain silicat but nothing about this type ot tank. I would be very grateful for any information as I'm planning on changing my coolant and would like to know how to prepare myself for this operation. 

 

 

If you do a parts number search, it may tell you in the description. Is your tank marked with anything other than the coolant spec - Eg. G13? 

If your EV does have a silica insert, it would most likely be the later type, which is reported to be a tubular plastic capsule - which has not been reported to suffer from the same problem as the earlier Mit Silicat 'teabag'. If this the case, it is likely to be visible when the EV cap is removed.

My 2020 tdi reservoir looks like yours and uses G12 evo coolant, no silica in the tank.    Pretty sure yours will use same coolant and this was the new version of coolant that doesnt need silica in the system.

P.s.   with putting my cambelt change back a couple of years (at 5 yrs old and only 35k miles) I also wanted an easy way to change the coolant for now: decided to use a big (2-300ml ) syringe and empty that reservoir (it holds ~650 ml ), top up with new, then repeat each week or 2 after good warm runs.  Used 5 litres of fresh coolant in total over a few months so with a little “ diminishing returns” each time I reckon about half or more of the original coolant has been changed ( maybe 4 litres fresh still in the system).   Not really any hassle to do and no risk of airlocks etc.      

Just an easy approach to consider.