Fan clutch issues

[JimT]

I don't know which clutch you have, but mine went a couple times over the past few years. First one, a Horton, started leaking air, turned out the o-ring failed. If I knew I might have been able to just replace the o-ring. Oh well. Peterbilt gave me a Borg Warner 1090-09650-01 to replace it but that one only lasted a year before the clutch itself stopped grabbing. So, last year I replaced that one with a new Horton Klondike K32 Rear Air 9908504. Unlike the Borg Warner, the Horton came with some replacement parts and the clutch wear surfaces can be replaced while still mounted in the truck. It was a few bucks more, but in my opinion well worth it. And just for reference, I only rack up about 70,000mi / year with minimal idling and maybe 2 months with occasional A/C usage each summer (I like the heat... until outside temps hit about 92-93).

Edit: To be fair, the Borg Warner actually last about a year and a half, installed 1/27/2022, replaced 7/31/2023