5.9 Cummins Fan Clutch Troubleshooting

Outside of the equipment, the 5.9 24v may be a reliable engine. The engine internals like the pistons, rod, and shaft can last a period and may hindrance on the far side of 500,000 miles. But how to perform 5.9 Cummins Fan Clutch Troubleshooting?

The turbo, which may be a common failure purpose on plenty of diesel, is incredibly robust. However, it’s not a power-capable turbocharger that leads plenty of oldsters to upgrade this item once finding out vital power gains. But when you use something for a long period it starts causing problems. So, what are the symptoms of 5.9 Cummins Fan Clutch?

5.9 Cummins Fan Clutch

About Fan Clutch

Turbo enthusiasts or perhaps non-specialists are aware that the radiator of their vehicle depends on constant flow to disperse the agent. while not an adequate quantity of flow, the air around the radiator becomes stagnant and overheats, which prevents it from cooling the engine.

Fan clutches are an important part of this cooling system and manage the operation of an engine cooling fan by transferring energy from the engine belt to the fan and permitting it to show at a certain speed, ultimately cooling the engine.

While many newer vehicles use electrical cooling fans to stay the engine cool, several older cars still use a mechanical fan clutch to manage the fans. The fan clutch may be a regulator device, which means its operation relies on temperature and is typically mounted on the pump or another belt-driven fan pulley.

The fan clutch spins loosely till the temperature reaches a precise level, then it engages so that the fan works at the most efficiency. Because the fan clutch may be a cooling system part, any problems typically cause warming and alternative issue

Symptoms Or Problems Of 5.9 Cummins Fan Clutch

The fan clutch is the most significant component of the cooling system. A properly-functioning fan clutch is important to the right functioning of your engine because it works to take care of a secure temperature vary. If the fan clutch is failing, there are a handful of how you’ll notice.

Usually, a faulty fan clutch produces some symptoms which will alert the driver of a possible issue. Understanding the symptoms of a nasty or failing fan clutch is important as it’ll assist you to stop the chance of potential harm to the engine. A bad or failing fan clutch may also leave you stranded with costly repair bills, thus pay attention to the symptoms mentioned below as they’re going to tell you if your fan clutch goes bad or failing:

Vehicle Overheating

A warming engine is often} the primary symptom that’s commonly related to a bad or failing fan clutch. Most drivers acknowledge once their engine overheats, however, most don’t now think the fan clutch is that the cause. The fan clutch controls the operation of the cooling fan, and if an addict clutch goes bad, it should not interact properly or at all.

As a result, it’ll disable the fans or forestall them from engaging at most potency, which can result in engine warming and a lot of severe problems if left unattended. Another common problem caused by the alternative fan clutch failure is insufficient heat in winter. once the fan clutch seizes, it remains engaged all the time, cooling off the engine too much.

Loose And Wobbling Fan

A fan clutch that’s going dangerous could cause the engine fan to become loose and wobbly. Typically, the unsteadiness of the fan is detected while driving, particularly at high speeds, like on the thruway. to ascertain if the fan is loose, activate the engine where the automotive is positioned, open the hood and check if the fan is unsteady whereas it spins. Another sign that shows if the engine fan is loose is oil coming out from the clutch hub.

Excessively Loud Cooling Fans

Another common symptom of a bad or failing fan clutch is too loud cooling fans. If the fan clutch gets stuck within the engaged position (which isn’t uncommon), it causes the fans to completely interact even once it’s not appropriate for them to perform. Sometimes, this could end in a too-loud engine from the fan processing at full speed. The sound could also be present at all times and simply loud once the engine is cold & hot.

A Decrease In Acceleration, Power & Fuel Potency

A decrease in performance is yet another symptom of a faulty fan clutch. A nasty or failing fan clutch leaves the fan for good engagement, inflicting a loud engine and a decrease in performance. Lot importantly, a stuck fan clutch will cause excessive, unnecessary drag on the engine, which ends up during a drop in acceleration, power & fuel efficiency, generally to a quite noticeable degree.

How To Troubleshoot Fan Clutch?

Spin The Fan

Electronic sorts of fan clutch might freewheel, however, most fan clutches ought to spin with a little effort. If the fan spins over three times, the probability is that you have a foul fan clutch, and if the fan doesn’t spin at all, the bearing is also taken.

Wiggle The Fan 

Strive to move the fan forward & backwards. If you feel it click or it wobbles over a quarter-inch, this might indicate a worn bearing.

Inspect For Leaks

The key to the fan clutch operation is its significant silicone fluid or oil. Viscous properties of silicone oil allow soft engagement to drive the fan, therefore if it leaks out, the clutch can weaken and eventually fail.

Check The Fan Speed

once the fan clutch engages, with a concomitant rush of air, it is detected audibly. Ideally, as engine temperature increases, a thermal fan clutch can interact at a particular temperature, and torque-limiting fan clutches can disengage at bound engine speeds.


Now you know that the fan clutch is one of the first cooling system parts and is imperative to the correct operation of the engine. once it fails, the engine is in danger of serious bad because of heating. If your fan clutch is dangerous or failed, replace it as presently as doable to forestall engine harm.

If your vehicle displays any of the symptoms on top, So, it means that your 5.9 Cummins fan clutch is not working properly, now you all know about 5.9 Cummins Fan Clutch Troubleshooting.

Frequently Asked Questions

Is a fan clutch supposed to be hard to turn?

It is normal for it to always be turning. However, the clutch should not interact with it totally till it’s hit the correct worker. On mine, it’s clear once the clutch has engaged the fan because it looks like a turbine.

How does one test a clutch fan solenoid?

An easy test for the operation of the magnet solely is to begin the truck, let it run, and wait for the fan to disengage once air pressure builds too normal. If you then shut the truck off, that kills power to the magnet, you ought to like a shot hear the magnet vent the air that’s within the line going to the clutch.

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