southerngq 4/2/2010Only two things you can do in this situation. Replace the blades and then repace the motor that controls the wipers. This is not a really expensive repair and fairly easy to do.
bartman99 4/5/2010I have a '95 GMC K1500 and I have had to replace my wiper motor 2 times on recall notices due to that issue. it is starting to happen again. check with you local GMC dealership about a possible recall.