yep sounds like a center vent problem. the pod behind the 2 center vents is the one. buth the other 4 should be changed out as well.

i'm doing just that on my 87 this weekend.

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Thanks Much!
Craig

1972 350sl Red/Blk 117k
1988 420sel charcoal/Blk 140k
1987 420sel gold/tan 128k
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