Replacing coolant tank with Silicon bag

[Rob_benton]

Hi

I want to replace my tank and the dealer says the tank doesn’t  contain the silicon bag from the factory.

Has anyone replace their tank and did you buy a new bag ? I want to replace the tank as it’s aged and peace of mind regarding the bag.

Thanks

[Rob_benton]

Looking into this further, you can buy a tank with and without the bag depending on the part number.
And other forums recommend having a bag to prevent future corrosion.

Question now is, is it worth replacing the bag every so often for peace of mind ?

[clubsport]

Peace of mind?

The coolant mix has anti freeze and anti corrosion inhibitors by design.

If the latest coolant tanks do not have a silica bag, do you have desisive evidence of the benefit of having a silsica bag present?

[Rob_benton]

Peace of mind of a old bag splitting. I read more and more of it happening online.


Strange that not every Vw Golf has a bag. Do some engines years have a material that corrodes more than others ? I don’t know.

[Talk-torque]

Been following this from when it emerged on the heating failure post. When is the bag supposed to have been deleted? My March 2019 car has one. Mine looks quite robust - not like the tea bag thing in the YouTube video! I’m not concerned at this stage in my car’s life, but interested.

I would agree with the view that coolant is designed to inhibit corrosion, so why the need for this bag? I’m guessing that it’s a bit like a magnetic drain plug - leaching corrosive particles from the coolant.

[Rob_benton]

I had read that G13 doesn’t contain as much protection as it used to. I don’t know if it’s true. Would Vw spend time and money fitting a bag if it wasn’t necessary?

I’m thinking of just fitting a new tank with bag every few years. Doesn’t cost much to prevent big bills if the worst was to happen.

[Finglonga]

Removed the bag from mine years ago, I have seen what happens if the bag bursts, virtually everything needs replacing.

[Carbon VW]

Just to be clear, this silicon bag is only found in cars with climate control fitted from the factory. As this was an option I didnt spec (option in ireland back at launch) my car has no such pouch. One less thing to worry about i suppose for me and other owners without climate control which I suspect are few and far between.

[martin998877]

How much are the two header tanks, ie with and without the bag? 

And do you have the part numbers please?

Thanks

[Rob_benton]

Sorry I don’t have the codes but my garage said the exact tank for my car was about £18.50 + vat so should have the bag. I’d obviously check !