Turn the microfilter cover knobs 90° and remove the cover by moving it upwards. Unscrew the bolts and remove the heater partition by moving it upwards.
The partition should be installed in the reverse order, while checking for damage and, if necessary, replacing the rubber seals (1, Fig. 4.150) left and right. Lubricate the rubber seals (1), left and right, with a lubricant to facilitate the sliding of rubber such as "technical petroleum jelly".
Clean the guide grooves and coat with grease to facilitate the sliding of the rubber. Insert the heater partition along the side guide grooves and secure it with the microfilter cover.