A8L V8-4.2L (BFM) (2004)
Hot steam and/or hot coolant can escape when the expansion tank is opened. Wrap a cloth around the filler cap and open carefully.
Open the coolant expansion tank and insert the first of the four silicate cartridges -1- into the expansion tank.
Press each of the cartridges -1- carefully past the MIN mark -2- in the tank without damaging the silicate cartridge
The correct positioning of the silicate cartridges -1- is shown in the illustration.
On vehicles on which the coolant expansion tank has no MIN mark, the four silicate cartridges should be positioned as shown in the illustration. Two
silicate cartridges -3- are inserted in one chamber of the tank.
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Check and Replace Idler Roller as necessary