I was never able to solve this issue to my satisfaction on my '94 Suburban
K1500 which I bought new. Was OK for first 2-3 years, then gradually got
your symptoms. I believe the real culprit is the buildup of salt, water,
grit and corrosion in all of the joints and movable parts in the arm
assembly. I'd use WD40 buy that just attracted more crud after a short term
fix. I'd look at other Tahoes, Suburbans, etc and it seemed to be the case
that the wiper pressed against the glass just fine when newer but most got
like mine eventually. We live in Alberta, Canada with a severe winter
climate, road salt, etc so it was a pain. I figured the only real solution
was to replace the entire arm assembly with a new one, but never did. Don't
know what that would have cost.
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