90gmcsierraL59
I'm Awesome
I misdiagnosed what I thought was an imminent 33 year old AC compressor failure on the 90 GMC that just got the L59 4L60E swap a little over 3000 miles ago. I was hearing a groaning noise at idle that only happened when the AC compressor was engaged. Cut the AC off and all was quiet. I bought a reman AC Delco OEM compressor and dropped the truck off to have it changed. My good friend who owns the shop called me and said the tensioner pulley on the newly installed Dirty Dingo AC bracket was very close to failure as the noise was still there after he swapped in the new compressor. A close inspection detected slop in the pulley with the bolt tight indicating a bad bearing. He put a new tensioner pulley on and all is well.( I am most certainly not blaming Dirty Dingo or calling them out as the bracket and assembly is a work of art) It says right on thier website that they use Gates pulleys exclusively and any company can get a bad pulley or bearing from a supplier due to a defect. That being said to the best of my knowledge that's the 1st failure I can ever remember having of a Gates part. I don't feel a bit bad about changing the original compressor either as it is 33 years old with over 250K on it. I am thankful it didn't fail at speed and tear up a bunch of other stuff.