Duramax Lifetime Supporter
Join Date: Oct 2009
Location: Jax, FL
Would help if we had more info.
When the truck does first start of the day, the fan clutch engages to assist the engine in warming up. Obviously, the colder the outside air temp is, the longer it will remain engaged in this scenario. Here in NE FL, my clutch remains engaged for about 5 mins with the outside temp of ~ 80 degrees.
After it disengages, it does not re-engage unless I am towing. Otherwise, it never engages other than cold start.
If you fan clutch stays engaged without anything in tow until 50 MPH you may have a clutch issue.
09 GMC SLT Dually
Steel Gray Metallic
All options except sunroof
Mods so far:
Alcoa 19.5s with Michelin XZE, Centramatics,Tow Mirrors, Chrome Grill Overlay, Rear underseat storage, Mudflaps all corners, 20% Window tint, 6" Oval Steps, B&W Turnover Hitch, B&W Companion Hitch, Sulastics, GM Campaign #PIT3009J, Wireless Console Charging, Bilstein 5100s, Raptor 3602RL
DF DRW Club Member #161