How do I know if my Duramax clutch fan is bad?

Raise the hood, with the engine off and cold. Reach in and spin the fan blade by hand. If it continues to spin freely for more than five turns with no signs of drag, you have a bad fan clutch.

How do I know if my fan clutch is bad?

To confirm the diagnosis, start with this simple test: Spin the fan as hard as you can on an engine that has not been started that day. If the fan rotates more than five times, you can bet the clutch is bad. You should feel some resistance and the fan may spin up to three times, depending on the ambient temperature.

Is there a recall on Duramax?

Summary: General Motors, LLC (GM) is recalling certain 2017-2019 Chevrolet Silverado 2500, 3500 and 2017-2019 GMC Sierra 2500 and 3500 vehicles equipped with a Duramax diesel 6.6 liter engine and an optional engine-block heater cord.

Should a fan clutch spin freely?

The fan should move freely by hand when the vehicle is off. Any strong resistance means its locking up. Thats when they get noisy.

What happens when a fan clutch goes bad?

A bad fan clutch may not engage properly or at all, and as a result, will disable the fans or prevent them from working at maximum efficiency. This may result in the engine overheating, which will lead to more serious issues if left unattended.

What’s the best fan clutch for a Duramax?

Get the kodiak fan clutch. Best upgrade you can do. My temps never go above 190. Pulling a trailer up a 8% grade for 5 miles I saw 205, fan roaring away. Once I crested the hill my temps dropped right away to 185-190.

When to start the fan on a Duramax?

What you don’t want is for it to wait until over 230*F and then finally kick in. As you know, fan clutch engagement is a function of the temperature of the air through the stack (which means outside plus heat from the stack), engine speed, and time (it’s a little slow to engage, then a little slow to disengage).

How does max flow Arctic keep Duramax running?

Also, unlike other competitor’s fan shrouds, this aluminum fan shroud covers more surface area to help keep things running cool. Max-Flow’s Arctic electric fan kit will keep your Duramax running cool under high loads when you need it the most while increasing horsepower and fuel economy.

Is the fan clutch on my LLY still working?

Enter your ride HERE to be a part of this months Ride of the Month Challenge! I believe the previous owner (or some shop) may have replaced the fan clutch on my LLY with a cheap import clutch unit. It operates, but is pretty inconsistent where it applies and disengages. I don’t expect it to be dead on exact same degree every time, but…..