As you could imagine, trying to stop a locked fan with a rag would not be a pleasant experience. 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. The newest viscous drives also feature Cold-Start Disengagement, which can help trucks and agricultural tractors warm up faster during cold conditions. 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. Posted - 02/07/2008 : 5:47:26 PM. 0000035192 00000 n hb```c``Jg`e`fgc@ >(GCPa J0 These fans are needed at slow speeds, typically below 35 mph and at idle. Unit 6 Scandinavia CourtChain Bar RoadCleckheatonBD19 3QW UK. (The previous clutch had loose bearings.) When I say it disengages, I mean it coasts to a stop! Original fan and water pump. One (of many) of my top things to do is service the Transmission. 2625 Check the gauge for proper operation (especially electric gauges). 0000001342 00000 n When the engine is off, there are a few things you can do to check the fan clutch: The internal combustion engine generates a lot of heat, which the engine cooling system is tasked with moderating. How to tell if your Viscous Fan Clutch is Bad - Sprinter Vans / Other Vehicles kansas city sprinters 38K views 1 year ago How Engine Cooling System Works | Autotechlabs Autotechlabs 6.3M. . By using our site, you agree to our. startxref 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. Never seems to lock up completely (or even the 90%) I tried applying 12v to the clutch directly (white wire) but there was no speed change. 0000069993 00000 n 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. Manufacturers names, logos, part numbers and descriptions are used for reference purposes only and are not intended to indicate that our fans, fan clutches or fan assemblies are made by the OEM. You must log in or register to reply here. X This is considered normal and may last more than 3 minutes in cooler climates or at lower driving speeds resulting in fan roar. Sometimes a customer will complain about a roaring noise coming from the engine bay. endstream endobj 43 0 obj <> endobj 44 0 obj <>/Font<>>>/Fields 35 0 R>> endobj 45 0 obj <>/Font<>/ProcSet[/PDF/Text/ImageC]/XObject<>>>/Rotate 0/Type/Page>> endobj 46 0 obj <>/Border[0 0 0]/H/P/Rect[54 2.64001 576 14.64]/Subtype/Link/Type/Annot>> endobj 47 0 obj <> endobj 48 0 obj <> endobj 49 0 obj <>stream Like all viscous fan clutches it may be turning, but is it working correctly? If the clutch is constantly engaged, the vehicle will suffer from poor gas mileage and loss of horsepower. I found this video by Scanner Danner where he's trying to diagnose a fan code. I just repaired a electro viscous clutch today on my 02 TrailBlazer. 77 0 obj <>stream xref Viscous Fan Clutch Not Working and Troubleshoot Guide 0000036305 00000 n 0000052838 00000 n But in the late 1950s, viscous fan clutches began to appear. The fan clutch should always engage when the system head pressure reaches in the 240 to 270 lbs range. This article has been viewed 118,630 times. When a leak occurs, it's at the bearing seal, at the center rear of. It is possible something like a plastic bag could have got wound up where the shaft goes in to the bearing. Skip to content Visit Us Diesel Components Inc. 670 E. Travelers Trail #105 Burnsville, MN 55337 Send an Email sales@dieselcomponentsinc.com Call us (800) 252-6625| (952) 890-2885 Buy Parts SERVICES A noisy, constant droning noise from the fan. I'm open to ideas. Fan Clutch Failure Modes and Troubleshooting | GMB Blog One last thing, check the wiring, especially at the clutch connector to ensure there are no broken wires. Too fast to try and slow it with a rag. Technical Services (UK) Ltd trading as Viscofans. will continue at full speed if the electrical circuit is faulty). Due to their control by the engine computer, they don't experience air leaks. I only found it while trying to force it to overheat. Traces of oil are perfectly normal, and wont necessarily be an indication that your clutch is shot. Keep holding it while the engine gets hotter, As it gets hotter, you should start feeling some tugging from the fan trying to get it going. If necessary, use the hood strut to hold the hood up so you can work unobstructed. Always check for manufacturer's specifications for any special procedures. Resurrecting this old thread. All rights reserved. Fan Clutches for Commercial Vehicles - SACHS - ZF Friedrichshafen If it feels rough or does not turn then replace the drive. It should turn smoothly with some drag. You are also talking to people that have been doing this for a while on this platform. If it spins more than three full rotations, this indicates that it may be prone to slipping. We are working every day to make sure our community is one of the best. This is because the clutch will seem to be in perfect working order, as the fault is on the inside. A locked-in, or seized, fan clutch can cause radiator fans to fully engage at all speeds. We use cookies and similar web technologies to recognize your repeat website visits and preferences and to analyze traffic. I replaced it earlier this year while chasing an overheating condition (along with the Water Pump and Thermostat). Some fan clutches are designed with a built-in thermometer somewhere on the instrument panel. PDF IK0900075 - Horton Stratis Fan Hub Diagnostics Page 1 of 6 6% I think its doing what u r saying, just hard to tell how hard it should be trying to pull out of hand. Most clutches will fade with time as spring-type clutches lose thermal sensitivity and fluid-filled clutches lose fluid viscosity. 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. Could not find any bad wires, just looseness in the actual pins inside the connector. Equally frustrating is diagnosing the fault. trailer Engine still runs great! 0000070141 00000 n We had a few overheating issues at Bremer Bay Why is it overlooked? If the temperature gauge is starting to climb and the fan is still not working, let go of the fan and turn on the heater to cool the engine, Turn off the heater and warm up the engine completely, Stop the fan using a rag like in the video below, Because the engine is at normal operating temperature, the PCM will not command the fan to run right away. If you still need assistance, contact our customer service team at (800) 810-9110. During engine start up, the EV fan clutch will engage and match engine speed for up to 3 minutes. The fan clutch is integral to the safe and efficient operation of your commercial vehicle or application engine. Overheating constantly, in trafc and on long pulls Check the coolant level. The info I posted regarding a locked clutch (beyond a few minutes) is still accurate. The valve in the EV, electro-viscous fan clutch, is intended to be controlled by PWM with an RPM sensor to provide feedback and compensate for age related slowdown. 2 Yes, the one in this video is bad. Solenoid coil / Actuator check - Try rotating solenoid coil / actuator and see if it's stuck, 5. By signing up you are agreeing to receive emails according to our privacy policy. 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. Viscous fan drive technology Precise thermal management that does so much more than keep engines cool. . A roaring noise could mean a number of things, including a bad wheel bearing, worn tires, or a differential that's low on oil. One smart strategy is to have your vehicles fan clutch and water pump replaced together. 0000000016 00000 n 0000002090 00000 n We recommend that you check the transducer and fan clutch assembly. Wire check - See if the wire to ECU is normal, 4. Thank you. I only found it while trying to force it to overheat. I feel like I reset something because I've never seen it go slow then engage. The PCM never puts it to 100%, 90% is the highest and that's at very high engine temps. 1AQ"aq2 #BR3$bC4% Check it by releasing it from its seat and measuring the distance between the spring and its retainer. The "drive disc" spins freely in the housing except for the silicon fluid. So you suspect that your fan clutch is defective. )Qo8Ni{Im'Ur$z3-XfLdE1c=e/ n4 a#I63px&LW42C`?c+fO~ lM |}&&`z`x7tv}3l6yUoo7~0EoeYf eh80/ar;)B]T# Usually a bad or failing fan clutch will produce a few symptoms that can alert the driver of a potential issue. You do realize that you are posting things that don't work for the everyday person trying to figure out his problem. Suggestion: See if there's any foreign object stuck on clutch fan, if any foreign objects absent, then it is likely the clutch fan. 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. 39 0 obj <>/Filter/FlateDecode/ID[<343069EB290844C787926BF2F1BCCBDD>]/Index[14 44]/Info 13 0 R/Length 111/Prev 69591/Root 15 0 R/Size 58/Type/XRef/W[1 2 1]>>stream Honestly, that sounds like normal behavior to me. These elements are natural in the process of Writing in a foreign language. Not everyone has a scanner that can command the fan clutch. %%EOF T444E overheat problems - School Bus Fleet Magazine Forums 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. Some viscous properties of the fan hub may vary the res JavaScript is disabled. NOTE: This fix will NOT help if your fan clutch is mechanically worn, or if the thermal va. Paying attention to your vehicle is the first step in an accurate diagnosis, effective repair, and reliable vehicle. "By perseverance, study, and eternal desire, any man can become great." You are using an out of date browser. (The previous clutch had loose bearings.) 0000030485 00000 n Last Updated: August 7, 2022 It may be a good idea to check the temperature of a few different vents. For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. How to test a fan clutch - YouTube o! It does not function like an on/off drive. It relies on temp sensor to detect temperature and send signals through ECM/ECU and switches the clutch fan to different levels accordingly. 0000060378 00000 n 0000021244 00000 n Hmmmmm.. that truck looks awfully familiar. It's often compared to a jet engine. Appreciate the help. 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. tt4*ittd830z02OL0 p Very good info on the function of the EV Clutch however, the quick function test requires a Tech 2. Viscous Fan Clutch Operation Symptoms - FreeASEStudyGuides.com Simply follow the steps below and you rill receive a replacement part number. You can also perform this test while the vehicle is parked and in neutral gear. NOTE: This fix will NOT help if your fan clutch is mechanically worn, or if the thermal valve is stuck closed or open.Silicone oil used in this video:http://www.rcplanet.com/Kyosho_Silicone_Oil_5000_p/kyosil5000.htm?codesf=4012476105\u0026gclid=CI2ypaPZuMkCFYI_aQodzRMD7wThe fan clutch featured in this video is from a 2002 Suzuki XL-7 V6:https://www.youtube.com/playlist?list=PLVsGvNkPZC6ovCedbyH9yHkXdoPr4nNWpThanks for watching! Viscous fan clutch is going to be the norm when more industrial engine uses ECM/ECU. When cruising, the vehicle moving through the air pushes air through the radiator, cooling the engine. Bad Fan Clutch Symptoms - In The Garage with CarParts.com How to Tell If Your Fan Clutch Is Going Bad - LiveAbout Squeaks while doing it too. Its even more annoying if you dont know what role the fan clutch plays as part of the engine cooling system in your engine! 1 0 obj<>/Metadata 259 0 R>> endobj 2 0 obj<> endobj 3 0 obj<> endobj 5 0 obj null endobj 8 0 obj<>/Font<>/XObject<>/ProcSet[/PDF/Text/ImageC]/ExtGState<>/Properties<>/MC1<>>>>>>> endobj 11 0 obj<> endobj 18 0 obj<> endobj 44 0 obj<>stream 0000066631 00000 n An overheating engine could literally weld itself into scrap metal. ()*6789:FGHIJVWXYZefghijtuvwxyz ? Subject: Troubleshooting Vehicles Equipped with Viscous Fan Drives Qualify by assuming the vehicle to be in OEM condition. Now somethimes it only gets to halfway to 210, even in the summer. 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. Throw away the ruined newspaper Rev the engine, you should notice that the fan increases speed, but not proportionally to the crank speed. Its important to maintain the fan clutch in your vehicle, as its responsible for testing the temperature of the air coming through the radiator and preventing the engine from overheating. Has the waterpump bearing seized around the fan shaft? While youre at it, consider the performance and fuel economy benefits of upgrading to electric cooling fans. Motorhomes and RVs | Engine cooling systems Identify Your Viscous Fan Clutch. I took a rag and dragged it against the outer part of the fan and was able to slow it with some firm pressure and eventually stopped it. References. 2004-12-07T10:24:41-05:00 Benjamin Jerew is an ASE-certified Master Automobile Technician with over a decade of experience in auto repair, maintenance, and diagnosis. If you suspect the problem is a locked-in fan coupling, but dont know what fan clutch symptoms to look for, then youre in the right place. This should lock the clutch and pull air like a dump truck. The engine temp reads a little low all the time, about 2-3 notches below 210. Fan clutch ticking | Ford Explorer - Ford Ranger Forums - Serious ~HO8$/` qAXwx$XA, uHfX m@;d;Hh22Ig 7Ya 6.7 cooling fan problem | Ford Powerstroke Diesel Forum Viscous Fan Clutch | Kit Masters Our community has been around for many years and pride ourselves on offering unbiased, critical discussion among people of all different backgrounds. Like any other part, fan clutches can develop issues that, if left unchecked, can be both devastating and costly. The fluid flows from a reservoir to the plate area at higher engine temperatures and returns to let the fan spin more freely as the engine cools. On the other hand, too much heat can be a big problem, melting non-metal engine parts and rendering lubricating oil useless. 1 Customer Question. Hope you don't mind me referencing your video? Then test the fan clutch by giving it a good push. Check for closed winterfront. You could also put 12v+ to the white wire at the clutch (or at the relay if you can figure out which terminal it is). Fan Clutch Symptoms of a Locked-in Fan Clutch | Viscofans I had a broken wire inside the loom when my fan thought it was a Jet fighter: I thought the way to test it was to short it so the clutch engaged? &\cUj It would definitely do damage. The actual fan speed should be approx - 250 RPM of desired.. Firstly, check to make sure something hasnt gotten caught or wrapped up around the back of the viscous fan clutch. Get Started > Always in stock For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. see page 3 of the GM Techlink Document I have attached. wikiHow is where trusted research and expert knowledge come together. By landing on this page, were guessing you know exactly what one does: This is what a fan clutch does, if youre unsure. 0 Electronic-Viscous Fan Clutch Troubleshooting. They contain a drive and driven plate with annular grooves that fill with a thick viscous silicon fluid. Never attempt to inspect or handle any of the mechanical components in the engine compartment while the engine is running. They make a loud whirling sound at highway speeds and when revving the engine.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'freeasestudyguides_com-medrectangle-4','ezslot_3',116,'0','0'])};__ez_fad_position('div-gpt-ad-freeasestudyguides_com-medrectangle-4-0'); Because the crankshaft drives this fan, check the accessory drive belt for wear and glazing. Ed Beery is an Automotive Specialist and the Owner of InTechgrity Automotive Excellence based in Denver, Colorado. 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. 0000070596 00000 n DT 1. I am going to do a re test of mine, I think it is bad and I want to be sure. I've been trying to read as many of these waterpump/fan post as possible. A viscous fan clutch enables the fan to more or less freewheel . When it happens its especially hard to take when you need your vehicle or application to finish a job. The Coolant in the Reservoir is nice and Orange like it should be but the Coolant in the Radiator is a Green-ish/Brown-ish color. gave the two in question a little twist with a fine nosed pliers. Thank you! Check All Cooling System Components Radiator, water pump, thermostat, temperature gauge, fault codes, etc. Found loose internal connections at the harness connector on the clutch and tightened them up a bit. If loosened, the P-clamp must be re-tightened to prevent the wiring harness from slipping through the P-clamp, causing tension on the Fan Clutch wiring. Time for a Radiator-Heater Core Flush? It was a junkyard unit off an 03 Envoy. Contact Whatsapp: +6012 879 3220 if you need any product! 0000014403 00000 n The sensor returns a signal pulse through the cooling fan speed signal circuit. There is a very easy way to test the fan clutch for staying fully engaged all the time. Virtually any on- or off-highway engine can benefit from viscous cooling technology. Im pretty sure that is why this method is posted. Viscous Fan Clutch. You could put +12V to the white wire, which will effectively put the fan to 100% engagement but my method will also show if it works at partial engagement. [KpB0G8/F7Xl u@qLTAUzpT0F,)xb7J+%*u)EkZ2mJikWc[B, DIY: Viscous Fan Clutch - Silicone Oil Refill - YouTube Try it again but pull the fan relay. Once stopped I can hold with light pressure of single finger or thumbpad, and after revving at 2k RPM same result to stop and hold. and A Transmission Fluid & Cooler Lines Flush, too? Check with diagnostic tool scanner - See if the readings reach the desired levels, 6. Solenoid coil / Actuator testor - Test solenoid coil / Actuator if you have an actuator tester. There are 7 references cited in this article, which can be found at the bottom of the page. y8#870S9sA1\ this will apply to T1N sprinters as well as NCV3 equipped with a. It may work at 100% but maybe not at 20-30%. If the air flow feels suspiciously hot or weak, it could just be a bad vent. As the engine speed increases, the blades of a flex fan change their angle. The pwm feed is positive so if that breaks it defaults to unlocked. Short of a relay sticking, I see no possible cause that it would be electrical. Even when the drive is off the fan will spin between 50-300 rpm. Fan clutch have a patented System Sentry, which goes about as an early cautioning fuse to alarm the administrator. I just joined today and been digging into whether I should replace EV on 2004 Buick Rainier 5.3. If the ground breaks it's the same. If fan speed is not detected a DTC will be set. Here, you can see where the fan and fan clutch are driven by the engine. Suggestion: Normally it has nothing to do with clutch fan. Nearly unheard of on modern cars with electric engine cooling fans, people sometimes still refer to the accessory drive belts as fan belts. This term harkens to the day when cars and trucks used drive belts to drive the cooling fan or water pump. When a fan clutch seizes, the engine is put at considerable risk from overheating, or over-cooling, and the damage done can be catastrophic if left alone. 2004-12-07T12:21:43-05:00 Next, locate the fan clutch bolted to the water pump in the engine compartment. 0000002179 00000 n Check the assembly for leaks through the seams and around the shaft. Search by part number to find a replacement for your fan clutch. This fluid's flow is regulated by a bi-metallic spring that opens and closes a control valve. How to tell if your Viscous Fan Clutch is Bad - YouTube 0000057354 00000 n Tuning and Understanding your Toyota Viscous Fan Clutch 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. 0000049755 00000 n No CEL. B=uJqc-I]-Y;6?VGx#qL.Vb&3Lv.EA5NYH$9&V=%n" The oil flows to and from the main chamber as engine heat fluctuates, engaging and disengaging the clutch. Perhaps the Heat Soak cannot get carried away because things may have gotten a bit "sluggish" inside of the radiating units? 0000053141 00000 n LEARN MORE >>, Cold-Start Disengagement helps engines warm up faster in the cold. `han_aHS{%2hp\MJXB (o_ya;b'aT^)s,_8<9|J]ba[||T-=%9k8^q+dzn.fmUO~7t~4=FiSuY>Q0? 0000052661 00000 n Inside the fan clutch, there is a small reservoir filled with a viscous silicone-based oil. 0000001895 00000 n Standard thermostatic fan clutches will only be present on cars and trucks with rear-wheel drive. The issue actually turned out to be a minor blown head gasket, with coolant slowly being shifted into the overflow bottle at high RPM and not being sucked back in, but the engine was able to get warmer because the viscous fan clutch wasn't working properly.
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