I tried to open mine the other day & it wouldn't open. It may have been that I didn't push it hard enough but today I had a look after reading this thread & decided to put a small amount of Teflon grease on the hook & hole in the flap. Tried several times & it works every time now.
Understand how it works, troubleshoot logically BEFORE replacing parts.
2001 T4 TRAKKA Syncro 2.5TDI,2006 Mk5 2.0TDI Golf manual,2001 Polo 1.4 16V manual [now sold], '09 2.0CR TDI Tiguan manual,
Numerous Mk1 Golf diesels
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