Trying to remove wiper arms, but must have been installed with a 1/2" impact wrench. Got a Lisle arm puller and it is 1/4" too short to catch the arm. Is there a GM tool or does anyone have a suggestion. Had plugged AC drain and found lots of leaf trash under the cowl but couldn't get to all of it.

 

I just give a shot of penetrating oil and wiggle, sometimes it works quickly, sometimes an overnight soak.

And a belated welcome to the site!!

 

aboard Jan10SS!

GM does have a tool, and I can't find the number to save my keister right now, but it's kind salty price wise.

Give this tool a look....

Help/Windshield Wiper Arm Tool 49023 - Read Reviews on Help #49023

And Oldblue's penetrating oil 'n wiggle method works, just be patient.