well I took my dash off to replace my heater core on my 86 sami, got it all back together just fine. I went to use my wipers, the went up I heard a loud thud the stopped right in my view so i had to push them down. they wont even move let alone make a noise. I have worked 14 days in a row so havent had time to take anything apart. Do i just replace the motor or try to fix it?