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What are the signs of a bad fan clutch?
Usually a bad or failing fan clutch will produce a few symptoms that can alert the driver of a potential issue.
- Vehicle overheating.
- Excessively loud cooling fans.
- Decrease in power, acceleration, and fuel efficiency.
Does the fan clutch affect the transmission?
Your transmission should not be affected however your truck will be slow and show a loss of power with a the fan locked up continually. (The roar should be driving you crazy) The only reason the tranny may be affected is if it down-shifts due to the loss of power when the fan goes into lock-up.
Should a fan clutch spin freely when hot?
N Sperlo wrote: The fan should move freely by hand when the vehicle is off. Any strong resistance means its locking up.
What temperature does a fan clutch engage?
about 170°F
At what temperatures do fan clutches engage? Answer: Most fan clutches engage at about 170°F air temperature (about 180-190°F engine temperature). They reduce the temperature about 20°F before disengaging.
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.
Will a fan clutch tighten itself?
it will tighten itself down just fine.
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.
What size is the fan clutch nut on a Duramax?
The nut is 47mm or 1-7/8″ which ever you prefer.
Will a bad fan clutch cause AC problems?
Yes, a bad fan clutch will cause A/C issues. The condenser needs air flow to cool hot refrigerant.
What will be the result of defective clutch?
Clutch Pedal Feels Loose or Spongey. Clutch Pedal is Hard to Engage. Transmission Makes A Grinding, Whirling or Chirping Noise in Neutral. Grinding Occurs When Shifting Gears.
How does the fan clutch work on a Duramax?
It has the cold engage at startup like most do, and disengages in a few miles until the coolant warms. I mean it operates ‘somewhat’ as I’d expect except for the big swings in the temp that it engages and disengages.
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 to remove the clutch on a Duramax?
Bottom pulley has to come off for that….a whole new level of fun there. Note: if you remove the air box and the shelf below it, that opens up enough room to access the tensioner to release the belt. It’s possible to swap the belt out and not remove the fan shroud, but with the airbox out of the way, pulling the shroud is no biggie.
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.