Sure way to tell is to take a hose to it... If, after water has been applied, you feel wetness around the seal... bingo.

You'll probably need to find an independent glass shop to replace the seal for you. Most of the chains don't like cars with metal trim inserts in the seal.

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'85 300TD "Puff The Magic Wagon" - Rolling Resto
'19 Mazda CX-9 Signature - Wife's sled
'21 Morgan 3-Wheeler P101 Edition
'95 E300d - SOLD
'84 300TD "Brown Betty" - Miss this one
'81 240D "China Baby" - Farm grocery getter