Found loose internal connections at the harness connector on the clutch and tightened them up a bit. 0000000016 00000 n I replaced it earlier this year while chasing an overheating condition (along with the Water Pump and Thermostat). 0000049755 00000 n PDF Electronically Controlled Viscous Cooling Fan Develop the tech skills you need for work and life. As the engine speed increases, the blades of a flex fan change their angle. This fluid's viscosity is measured in CST or centistokes and degrades over time. If the fan clutch requires repair, take the vehicle to a qualified mechanic. These issues will draw the PCM's attention, and it will turn on the check engine light to warn you about them. Electronic-Viscous Fan Clutch Troubleshooting. Wanted to get some input/feed backI have always done basic maintenance after purchasing a used vehicle regardless of what or anything that I know from the previous owner that's been serviced. If your fan clutch is not operating the way it should, it's likely due to a fluid leak or a bad thermostatic spring or valve. Here's a list of the most common fan clutch noises and what each one could mean: 1. %PDF-1.4 % The fluid wears, rendering it incapable of grabbing the drive and driven plates and offer the gripping resistance needed to hold them together. Like all viscous fan clutches it may be turning, but is it working correctly? Viscous drives with CSD hold oil in the reservoir while the engine is off, so the fan disengages up to 80 percent faster than standard viscous drives. The info I posted regarding a locked clutch (beyond a few minutes) is still accurate. A bum fan clutch drains horsepower from the engine to keep the mechanical fans running, which can ultimately lead to critical overheating, decreased fuel economy, and poor general performance. We use cookies and similar web technologies to recognize your repeat website visits and preferences and to analyze traffic. In our 97-98 AmTran REs, the 444s run 210* all the time, sometimes a little less in the winter, in the summer, the fans are almost constant on, and if it's hot enough (85-90* outside) they'll hit 230* under load. If the fan clutch is going bad or has failed, there are a couple of ways you may notice. hb```c``Jg`e`fgc@ >(GCPa J0 They contain a drive and driven plate with annular grooves that fill with a thick viscous silicon fluid. If you find youre experiencing any of these fan clutch symptoms make sure to get your fan clutch checked out properly by a professional technician to correctly diagnose the issue. 0000001551 00000 n Once viscous fluid is in the working chamber, shearing of the fluid results in fan rotation. A locked-in, or seized, fan clutch can cause radiator fans to fully engage at all speeds. Viscous drives tend to have the first two issues. http://gmtnation.com/forums/threads/dtc-p1481-electric-fan-clutch-inop.12899/#post-412028, https://gmtnation.com/forums/threads/chasing-gremlins.20197/, Try to stop the fan using a rag like in the video below, Hold it for a little bit. One smart strategy is to have your vehicles fan clutch and water pump replaced together. The pwm feed is positive so if that breaks it defaults to unlocked. Tech Tip: Electric viscous fan clutches in 2003-09 5.9L Dodge Ram So you suspect that your fan clutch is defective. 0000001016 00000 n A DIY: Viscous Fan Clutch - Silicone Oil Refill - YouTube I went out and started up the truck and the fan was spinning FAST. You can do this by making a note of unusual noise or temperatures while driving, inspecting the housing for oil leakage or physical damage, measuring the amount of resistance offered by the fan blades. Engine fan consume the largest portion of the energy supply from the engine, up to 10%. Viscofans is in no way affiliated to any of the brands shown on this site. These fans are more efficient than flex fans that are controlled by engine speed instead of temperature. Like any other part, fan clutches can develop issues that, if left unchecked, can be both devastating and costly. You should probably slow your role a little and do more reading. 1. The oil flows to and from the main chamber as engine heat fluctuates, engaging and disengaging the clutch. This weekend I was going to do a Coolant Flush on the TB for the first time cause IMO the fluid is not looking that great. One of two conditions is possible. If you have difficulty rotating or it's just stuck, then it could be either foreign object or clutch fan. These fans are needed at slow speeds, typically below 35 mph and at idle. . These fans are needed at slow speeds, typically below 35 mph and at idle. If the fan still hasnt kicked in by the time temperature reaches about 200F (93C), you can be sure that theres a problem somewhere. But in the late 1950s, viscous fan clutches began to appear. All it does is freewheel and has no resistance. 3000000/10000 Viscous fan clutches are belt-driven and found on many older rear-wheel-drive passenger cars. Viscous fan clutches are belt-driven and found on many older rear-wheel-drive passenger cars. Hope you don't mind me referencing your video? Include your email address to get a message when this question is answered. Has the waterpump bearing seized around the fan shaft? If your unit has one, keep an eye on the temperature so youll know about when the fan speed should begin ramping up. Ed and the InTechgrity Automotive Excellence Team are approved by the American Automobile Association (AAA) for repairs and are Automotive Service Excellence (ASE) certified. It may be a good idea to check the temperature of a few different vents. A locked-in fan clutch can experience increased vibrations that will pass on to the radiator fan and other parts of the engine, with the bearing no longer running at the the differential speeds that it should. Fan Clutch A/C Problems. | Cummins Diesel Forum It relies on temp sensor to detect temperature and send signals through ECM/ECU and switches the clutch fan to different levels accordingly. Check the gauge for proper operation (especially electric gauges). Some fan clutches are designed with a built-in thermometer somewhere on the instrument panel. It is these rings, and the silicon fluid in the gaps between them that couple the system together.The inner ring is taller than the others. 2004-12-07T12:21:43-05:00 We use cookies to make wikiHow great. By opening and closing the fluid port valve, the PCM controls the fan speed. I dont want to go near the fan and try and stop it. Adobe d If it spins more than three full rotations, this indicates that it may be prone to slipping. I've been trying to read as many of these waterpump/fan post as possible. I am going to do a re test of mine, I think it is bad and I want to be sure. These elements are natural in the process of Writing in a foreign language. Fan Clutches for Commercial Vehicles - SACHS - ZF Friedrichshafen Also when I first press the gas pedal it seems like the engine wants to stall which is probably something totally different? Viscous Fan Clutch. `han_aHS{%2hp\MJXB (o_ya;b'aT^)s,_8<9|J]ba[||T-=%9k8^q+dzn.fmUO~7t~4=FiSuY>Q0? Now somethimes it only gets to halfway to 210, even in the summer. When I say it disengages, I mean it coasts to a stop! Company No. Anyone seen a case where the EV Fan Clutch DISENGAGES completely? Clutch fan check - See if any visible damage on clutch fan 3. LEARN MORE >>. Thanks to all authors for creating a page that has been read 118,630 times. It may work at 100% but maybe not at 20-30%. Consider the symptoms listed above and be aware of potential failure. adobe:docid:photoshop:2ce534b1-d8a3-11d8-a54e-a63691f3af4c You can also perform this test while the vehicle is parked and in neutral gear. Normally it's caused by faulty clutch fan, Possible Cause: Clutch fan wire got cut/pulled by foreign factors. ~HO8$/` qAXwx$XA, uHfX m@;d;Hh22Ig 7Ya [KpB0G8/F7Xl u@qLTAUzpT0F,)xb7J+%*u)EkZ2mJikWc[B, Check the assembly for leaks through the seams and around the shaft. By . Any input would be appreciated. I'm open to ideas. 1 hz on the cooling fan speed signal circuit equals about 1 rpm of actual fan speed. How to Tell If Your Fan Clutch Is Going Bad - LiveAbout This animation of Horton's latest variable-speed fan drive, the LCX, shows viscous cooling technology in action. Most clutches will fade with time as spring-type clutches lose thermal sensitivity and fluid-filled clutches lose fluid viscosity. - GENERAL GEORGE S. PATTON. Vehicle overheating One of the first symptoms that is commonly associated with a bad or failing fan clutch is an overheating engine. It should turn smoothly with some drag. Right when it stop it tried to "tick" forward as I was holding it. If the clutch does not engage when the AC is turned on when a voltage is present is a sign that the fan is damaged. The sensor returns a signal pulse through the cooling fan speed signal circuit. My fan seems to run fast all the time but not loud like the jet engine i've read about. OK. Front-wheel drive vehicles are equipped with a completely different cooling system due to the way the engine is configured. Contact Whatsapp: +6012 879 3220 if you need any product! '06 Trailblazer LS, '14 Silverado LT Z71, and '17 Jeep Renegade Trailhawk, "Chance Favors The Prepared Mind" Dr. Louis Pasteur, You can't have my fish, but if you ask nicely, I'll help you catch your own. Stopped with rag pushed in for a few minutes but couldnt see any temp rise, with air on, but its 55F here. %PDF-1.4 % The engine temp reads a little low all the time, about 2-3 notches below 210. Posted - 02/07/2008 : 5:47:26 PM. Squeaks while doing it too. 0000060378 00000 n Luckily, there are a few symptoms you can look for to diagnose whether the fault is a seized fan clutch or not. If an open or shorted condition has developed in the electronically controlled viscous fan clutch circuit, a Diagnostic Trouble Code (DTC) can be set. Check to make sure each of the bolts holding the fan clutch in place is secure and intact. Warning: This post may contain misspelling, grammatical errors, disorganized sentence structure. Locked-in fan clutch symptoms. If you need advice on replacing a faulty fan clutch, please get in touch. They contain a drive and driven plate with annular grooves that fill with a thick viscous silicon fluid. Read more! PDF IK0900075 - Horton Stratis Fan Hub Diagnostics Page 1 of 6 6% Time for a Radiator-Heater Core Flush? Keep an eye out for any visible components that are bent, crooked, or missing. Troubleshooting Common Condenser Fan Problems, Signs and Symptoms of Spark Plug Problems, Reasons Why Your Car's Idle Speed Might Be Too High, Engine Ignition and Cam Timing for the Novice, Troubleshooting Engine Driveability Problems: Surging or Misfiring. When the engine starts to get too hot, the fan clutch takes the air flowing through the radiator, cools it down, and feeds it into the engine to cool it. The valve is activated by a pulse width modulation (PWM) output signal from the powertrain control module (PCM). The clutch is full of viscous fluid, so the air friction on the fan starts overcoming the friction of the fluid in the clutch and it stops accelerating with the engine. In addition to regulating engine temperatures with razor-sharp precision, viscous-operated fan drives can produce lower emissions, decrease noise pollution, provide fuel savings and ultimately increase performance. They also have a thermostatic spring. tt4*ittd830z02OL0 p Virtually any on- or off-highway engine can benefit from viscous cooling technology. How to Test a Fan Clutch | Hot Rod Forum this will apply to T1N sprinters as well as NCV3 equipped with a. There is an air leak in the fan drive. %PDF-1.5 % The engine cooling fan, made of plastic or metal, isnt hard-connected to the fan pulley or water pump, but instead is soft-connected via the fan clutch. For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. <<59055635F8F5FE459E851E498E113946>]/Prev 686576>> Even when the drive is off the fan will spin between 50-300 rpm. Advantages of variable-speed fan drives that use viscous technology, LA Sanitation increases uptime and driver comfort, Solving overcooling problems for generators in cold weather, Maximizing uptime and efficiency for heavy haulers, Viscous drive boosts Canadian heavy equipment supplier's value, 1,100-truck fleet parts manager: Viscous drives 'have worked flawlessly', Optimized cooling means more power to vehicle's wheels, Decreased particulate matter release/lower CO2 emissions, Faster engine and cab warmupwithCold-Start Disengagement.
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