Freightliner fan clutch operation

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freightliner fan clutch operation

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Thread starter fortwayne Start date Jan 13, Ok I am doing injecting water into veins of those hit and miss repairs.

The water temp in my truck has been running around pretty hot, eh. The first step was drain the radiator, all new fluids and then a new thermostat.

However, after checking for any leaks after the repairs, nothing was found and it idled all night just fine around the range with the rpm's running at around However, while running down the road the temp quickly goes back up to 'ish or so So what gives? Is it possible I just have a sensor that is goofy and old? Can't if think that a water pump could cause this issue Dakota Veteran Expediter. I was told by tech's that the older freightliner ran hotter, don"t know if that is true or not.

When driving and the temp rises do you here the fan clutch come on, it's pretty loud and hard to miss when it is on. Alsois normal at least for the older frieghtliners. I'm sure Greg will know better than me since he has an FL Greg where are you? Sounds to me like the fan clutch is going bad or the radiator is not flowing the way it needs to.

Fleet Owner. Some of the engines on those do run hotter. If it has the original radiator, I would take a lazer temp gun and run it on the length of the radiator and see if you locate a cool spot. You are looking for a plugged radiator is the purpose in doing this.Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website like our supporting vendors. Their ads help keep Steel Soldiers going. Please consider disabling your ad blockers for the site.

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How to Tell If Your Fan Clutch Is Going Bad

Thread starter wyocommo Start date Jul 11, Steel Soldiers is supported by: 1 2 Next. Spent the afternoon troubleshooting why the fan clutch does not engage at proper temp. Clutch is working as advertised when air is removed.

When power is removed from quick exhaust solenoid it does not exhaust air in the clutch circuit to allow the clutch to engage.

Dismantled solenoid and cleaned, appears to be OK.Discussion in ' Trucks [ Eighteen Wheelers ] ' started by tkilbyJun 23, Log in or Sign up. Find Trucking Jobs. Engine Fan Staying On Jun 23, 1. The Horton clutch seems to be in good working order and will release with air pressure. Occasionally the fan does cycle correctly but not often.

Opinions or suggestions appreciated. Yes, let employers and TruckersReport text me with new opportunities, job alerts and other career information to the number I provided.

There is no charge for this service, but standard message and data rates may apply. Jun 23, 2. Jun 23, 3. I was thinking the problem was that the fan control solenoid did'nt have electrical power, but was'nt sure why it did'nt Jun 23, 4.

The ecm sends power to the solenoid to shut the fan off. Jun 24, 5. Unplug the swtich and put a jumper wire on it and if the fan stops you found your porblem. Jun 24, 6. Jun 24, 7. I gave it a little tug and it came out.A properly-functioning fan clutch is critical to engine reliability, as it works to maintain a safe temperature range. A failing fan clutch could leave you stranded with expensive repair bills, so pay attention to these symptoms. When the fan clutch engages, it spins up greatly, increasing air flow through the radiator and over the engine.

If the fan clutch is going bad or has failed, there are a couple of ways you may notice. Paying attention to your vehicle is the first step in an accurate diagnosis, effective repair, and reliable vehicle.

freightliner fan clutch operation

The internal combustion engine generates a lot of heat, which the engine cooling system is tasked with moderating. A little heat is a good thing, improving fuel vaporization, performance, and fuel economy — it also warms up the cabin in the winter.

On the other hand, too much heat can be a big problem, melting non-metal engine parts and rendering lubricating oil useless. An overheating engine could literally weld itself into scrap metal.

If your fan clutch has gone bad, replace it as soon as possible to prevent engine damage. Benjamin Jerew. Benjamin Jerew is an ASE-certified Master Automobile Technician with over a decade of experience in auto repair, maintenance, and diagnosis. Updated August 20, A thermal fan clutch reacts to temperature of the air rushing over it from the radiator.

As the radiator heats up, the air passing through it also heats up. This heats up a small bi-metallic coil in the face of the fan clutch, releasing an internal valve. The valve releases heavy silicone fluid, which locks the fan blades to the fan pulley. A torque-limiting fan clutch reacts to engine speed. A centrifugal valve opens to allow the flow of heavy silicone fluid, locking the fan blades to the pulley.

At idle and low engine speeds, this fan clutch is fully engaged, gradually disengaging as engine speed increases. Depending on the application, it may freewheel above 2, to 3, rpm. Instead, the engine control module ECM or fan control module uses various sensors to determine when to engage the fan clutch, such as at engine idle, low vehicle speed, air conditioning compressor engagement, or above a certain engine temperature threshold.Please login or register.

I was looking at my ecm and it has the wire L already hooked up. I suspect that the wiring already exist for a fan switch to be used and I think I found the hook up for the clutch to be hooked to, Tye wrapped to the top of the motor. Thank you Eddie.

freightliner fan clutch operation

Eddie, Call Freightliner, Gaffney in the morning: Be sure to have your VIN handy. I was told to call cat since it is their harness on the motor. I got a schematic from them but it doesn't show the wire L coming off the ecm. Somewhere on this site I think I read where someone had the same wire hooked up on the ecm but they didn't say where or how the clutch was hooked up.

Any help would be appreciated. Thanks Brett I read that one and see how he did it. I could wire it like Bill did but would like to use the existing wire's. Ok I did find the tread that I had printed off it was from Claude Eichenour and it does have a little more information about the wiring.

Thank you. Jim Schmid Jr. Member Posts: Eddie, I have a xc chassis with C7 engine and mine did not have the Horton Fan Clutch wiring preinstalled. I installed the clutch from scratch. I also don't believe Cat would supply a harness with this connector because the clutch needs separate, relay controlled, power to operate. The FL tech should have known all this. Regards, Jim.

Jim, I did get a schematic from Cat and it didn't show anything for a fan. A part number that Claude Eichenour had on his list of parts to do this install was on the list. I had showed the cat and FL parts guys and they all said it was not a good number but calling FL and telling the person the number, I was told it was a drawing for a wiring diagram.

On it shows The wire coming from the ecm L and coming around to the driver side frame rail and ends up on a junction block right by the transmission mount. It also shows the rest of how it is wired in. That's as far as I have got and haven't had the time to finish it. I read where this chassis was used for the rear or side radiator. So far the wiring goes as far as that junction and from there I have the harness that Claude shows on his install list but I still need to trace from there.

Thank you for your help Jim Eddie Here is the diagram. D wiring diagram.The fan clutch is a cooling system component that controls the operation of the engine cooling fans. While many newer vehicles now use electric cooling fans to keep the engine cool, many older vehicles used a mechanical fan clutch to control the fans. The fan clutch is a thermostatic device, which means it operates based off temperature, and is usually mounted on the water pump, or another belt driven pulley.

The fan clutch will spin loosely until the temperature reaches a certain level, at which point the fan clutch will fully engage so that the fan can work at maximum efficiency. As the fan clutch is a cooling system component, any issues with it can cause overheating and other issues. Usually a bad or failing fan clutch will produce a few symptoms that can alert the driver of a potential issue.

One of the first symptoms that is commonly associated with a bad or failing fan clutch is an overheating engine.

99 Freightliner problems

The fan clutch is responsible for controlling the operation of the cooling fans. 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. Another common symptom of a faulty fan clutch is excessively loud cooling fans. If the fan clutch gets stuck in the engaged position, which is not uncommon, it will cause the fans to fully engage even when it is not desirable for them to be on.

This may result in an excessively loud engine from the fan blowing at full speed. The sound may be easily audible and present at all times when the engine is cold and hot. A decrease in performance is another symptom of a bad or failing fan clutch. A faulty fan clutch that leaves the fan permanently engaged will not only cause a noisy engine, but can also cause a decrease in performance.

A stuck fan clutch will cause excessive, unnecessary drag on the engine, which can cause a drop in poweraccelerationand fuel efficiencysometimes to a quite noticeable degree. As the fan clutch is one of the main cooling system components, it is very important to the proper operation of the engine.

When it fails, the engine can be put at risk of serious damage due to overheating. If your vehicle is displaying any of the symptoms above, or you suspect that your fan clutch may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the car will need a fan clutch replacement.

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Thousands more photos here. The fan clutch is a coupling device that is located between the water pump shaft and the fan. The Fan Clutch allows the fan to operate at lower speeds and effectively detach at higher speeds when the vehicle is moving and air movement due to velocity aids to cool the engine.

There are two types of Fan Clutches, thermal and non thermal fan clutches, also called centrifugal clutches. Both types operate on the fluid-drive principle. Non-thermal fan clutches operate based on the water pump shaft speed. When the water pump shaft is spinning at low and idle speeds, the clutch will spin the fan at about a ratio. During high speed rotation the silicone fluid within the fan clutch reduces its ability to spin the fan at full speed and the energy transferred from the water pump shaft, through the clutch to the fan is reduced.

The result is less load on the engine as the fan almost free-wheels. Benefits, drawbacks and key points about Non-Thermal Fan Clutches:. Thermal Fan Clutches Thermal Fan Clutches are a little more sophisticated in operation than non-thermal fan clutches.

The thermal clutch responds based on temperature changes within the engine bay.


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