silica bag inside coolant tank ???

[kevin#34]

quite surprised after having watched this video (I have never heard or read about that), so checked my TT-RS coolant tank, and yes, there is a silica bag inside

https://www.youtube.com/watch?v=t1ia1ybgUt4

what do you think guys? (there are several people stating their bag got broken, letting the silica damaging the cooling system...)

[GTItoS4]

Designed to prevent sloshing and spuriously tripping the overfill/underfill sensors presumably.

[o1turbo30v]

Designed to prevent sloshing and spuriously tripping the overfill/underfill sensors presumably.

"From one of VW's Self Study Program 514 page 31:

Coolant Expansion Tank with Silicate Repository

The coolant expansion tank contains a silicate repository. Silicate is used to protect the aluminum components in the coolant
system from corrosion. There are silicates in the G13 coolant, but they are used up over time if the engine is subject to high
thermal loads.

To compensate for the silicate consumption, silicate is taken from the repository and added to the coolant. The silicate
repository provides additional protection against corrosion for the aluminum components in the coolant system over the entire
lifespan of the engine."

[GTItoS4]

Neat. Don't remove lol.