Question about 2004 Pontiac Montana
O yes, the notorious GM van wiper problem.
The clutch mechanism on the wiper motors are difficult to say the least.
The spline on the shaft from the wiper motor may have slipped putting the wiper motor to wiper transmission out of synchronization.
These are tricky to get back in time.
Also there is a tab on the crank arm designed to catch the clutch that wears and/or bends down and will not allow proper operation.
Most of the time I replace the crank arm assembly as they are prone to wear.
Check all the parts on the wiper transmission for siezed pivots and bent arms.
I hope this helps you towards a repair.
Thank you for using FixYa.
Posted on Nov 15, 2010
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Posted on Jan 02, 2017
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