Short feedback: Below the sticky wrap of the A/C & heater block there is partially overlapping metal sheet. Seems that the purpose of the wrap is also to stop condensed water leaving the block. My wrap was still very sticky but obviously with time it lost part of its sealing ability. The new applied sealant stopped all leakage. There was not a single drop of water even after two hours driving in hot and humid weather conditions and A/C at maximum power.
Brgds
Hartwig
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