Most power antenna stop going up/down because of a broken plastic cord that is attached to the top section of the mast. This breaks and GM has discontinued the part. Other vendors now want around $35 plus shipping just for the replacement plastic part.
I developed a method of using plastic coated steel wire in place of the plastic and have repaired over 20 using this method. This steel wire should be a lifetime fix. I will replace any that break while in the original owners hands.
Edited by Barney Eaton, 21 November 2012 - 11:08 PM.