0000070141 00000 n %PDF-1.4 % GB 447 5091 38. This article has been viewed 118,630 times. 0000036305 00000 n For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. 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. We use cookies to make wikiHow great. It was a junkyard unit off an 03 Envoy. 2004-12-07T12:21:43-05:00 A During engine start up, the EV fan clutch will engage and match engine speed for up to 3 minutes. Possible Cause: Damaged engine fan usually caused by friction, wear or entry of foreign objects. Ideally, the fan shouldnt spin more than 1-1 times. Usually a bad or failing fan clutch will produce a few symptoms that can alert the driver of a potential issue. %PDF-1.5 % Now what? Check All Cooling System Components Radiator, water pump, thermostat, temperature gauge, fault codes, etc. A viscous fan clutch enables the fan to more or less freewheel . Sometimes a customer will complain about a roaring noise coming from the engine bay. Motorhomes and RVs | Engine cooling systems By signing up you are agreeing to receive emails according to our privacy policy. 4.Engine Fan Test Results You will need to monitor the entire fan test while it is running to determine if the fan has passed or failed. How to tell if your Viscous Fan Clutch is Bad - YouTube Develop the tech skills you need for work and life. The pwm feed is positive so if that breaks it defaults to unlocked. Equally frustrating is diagnosing the fault. May daughters use it now. While youre at it, consider the performance and fuel economy benefits of upgrading to electric cooling fans. Right when it stop it tried to "tick" forward as I was holding it. They contain a drive and driven plate with annular grooves that fill with a thick viscous silicon fluid. Search by part number to find a replacement for your fan clutch. The fluid wears, rendering it incapable of grabbing the drive and driven plates and offer the gripping resistance needed to hold them together. Some viscous properties of the fan hub may vary the res 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. For a better experience, please enable JavaScript in your browser before proceeding. It will regulate engine temperatures more efficiently compared to older direct fuel injection engine models. 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. Traces of oil are perfectly normal, and wont necessarily be an indication that your clutch is shot. 2004-12-07T12:21:43-05:00 image/tiff I found this video by Scanner Danner where he's trying to diagnose a fan code. You should feel some tugging from the fan trying to get it going again. 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. Solenoid coil / Actuator testor - Test solenoid coil / Actuator if you have an actuator tester. Time for a Radiator-Heater Core Flush? All browsing and transactions within are secured by an SSL Certificate with high-strength encryption. These elements are natural in the process of Writing in a foreign language. Electrical faults don't have to be wiring, they can be control module input/output related including: Mooseman, post was a long time ago and not sure this is even active! [KpB0G8/F7Xl u@qLTAUzpT0F,)xb7J+%*u)EkZ2mJikWc[B, PDF Electronically Controlled Viscous Cooling Fan Fan Clutch Replacement - Popular Mechanics For more information about ASE, visit the official ASE website at www.ase.com, Copyright 2008-2023 All Rights Reserved Privacy Policy Disclaimer Sitemap. Suggestion: Normally it has nothing to do with 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. Its possible to upgrade from a non-thermal clutch to a more efficient thermal model, but not the other way around. How to Tell If Your Fan Clutch Is Going Bad - LiveAbout Ed and the InTechgrity Automotive Excellence Team are approved by the American Automobile Association (AAA) for repairs and are Automotive Service Excellence (ASE) certified. Secondly, if your viscous fan hub is electronically controlled, check if the wire is unplugged or damaged. Resurrecting this old thread. A failing fan clutch could leave you stranded with expensive repair bills, so pay attention to these symptoms. Paying attention to your vehicle is the first step in an accurate diagnosis, effective repair, and reliable vehicle. 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. This condition will cease shortly upon disengagement. 0000035192 00000 n LEARN MORE >>. Both parts tend to wear out at about the same time, so if one is giving you trouble, the other may not be far behind. Before you go looking for your fan clutch, make sure your vehicle is in park, with the engine off and the handbrake firmly engaged. If the clutch is constantly engaged, the vehicle will suffer from poor gas mileage and loss of horsepower. This includes heavy- and medium-duty trucks, agricultural tractors, vocational and specialty vehicles. For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. 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. The wires run in a rubber hose in front of the fan. 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. How Does a Viscous Fan Clutch Work? - YouTube Identify Your Viscous Fan Clutch. You do realize that you are posting things that don't work for the everyday person trying to figure out his problem. Viscous fan clutch is going to be the norm when more industrial engine uses ECM/ECU. These fans are needed at slow speeds, typically below 35 mph and at idle. Get Started > Always in stock When I said DO NOT TEST, that's with the method described with the rag. They can cause a vehicle to overheat at idle and in heavy traffic. Solenoid coil / Actuator check - Try rotating solenoid coil / actuator and see if it's stuck, 5. 0000014403 00000 n Check to make sure each of the bolts holding the fan clutch in place is secure and intact. Viscous fan hub; is yours working as it should? - 4WDing Australia I just repaired a electro viscous clutch today on my 02 TrailBlazer. Posted - 02/07/2008 : 5:47:26 PM. This is because the clutch will seem to be in perfect working order, as the fault is on the inside. This is considered normal and may last more than 3 minutes in cooler climates or at lower driving speeds resulting in fan roar. The "drive disc" spins freely in the housing except for the silicon fluid. There is an air leak in the fan drive. 0000066631 00000 n 0000035283 00000 n Common Fan Clutch Noises And What They Mean | GMB Blog Normal solenoid coil electric current should be 40mA to 60mA. All rights reserved. It does not function like an on/off drive. It will also set a code if the fan clutch is not running at the set RPM - too slow or too fast. Try it again but pull the fan relay. 57 0 obj <>stream By . Engine fan consume the largest portion of the energy supply from the engine, up to 10%. Viscous fan clutches are belt-driven and found on many older rear-wheel-drive passenger cars. - GENERAL GEORGE S. PATTON. Check Mechanical Integrity of Clutch With engine off, rotate fan by hand. This article was co-authored by Ed Beery. I am going to do a re test of mine, I think it is bad and I want to be sure. Last Updated: August 7, 2022 The engine temp reads a little low all the time, about 2-3 notches below 210. Fan Clutch Symptoms of a Locked-in Fan Clutch | Viscofans The fan clutch is integral to the safe and efficient operation of your commercial vehicle or application engine. Suggestion: See if there's any foreign object stuck on clutch fan, if any foreign objects absent, then it is likely the clutch fan. and A Transmission Fluid & Cooler Lines Flush, too? In most cases, fan blades are designed to flex up to. It is possible something like a plastic bag could have got wound up where the shaft goes in to the bearing. Shows the signals to and from the the fan and how the fan operates when commanded by the PCM and the scanner. 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. Keep an eye out for any visible components that are bent, crooked, or missing. g? 0000060846 00000 n '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. For your own safety, you should never attempt to manually test your fan clutch while the vehicle is running. Inspecting the Fan Clutch Manually Download Article 1 Pop the hood. The "drive disc" and the "front half" share these closely spaced rings. 77 0 obj <>stream Then test the fan clutch by giving it a good push. Thank you! Standard thermostatic fan clutches will only be present on cars and trucks with rear-wheel drive. Always check for manufacturer's specifications for any special procedures. No one enjoys a vehicle or application breaking down: No one. Perhaps the Heat Soak cannot get carried away because things may have gotten a bit "sluggish" inside of the radiating units? Unit 6 Scandinavia CourtChain Bar RoadCleckheatonBD19 3QW UK. As engine temperature increases, look for a sudden jump in fan speed. Also verify no indication of viscous fluid leakage. Global Parts Distributors has the electronic fan clutch assembly: part number 2911297. If it doesn't change, it's toast. 2625 The valve is activated by a pulse width modulation (PWM) output signal from the powertrain control module (PCM). 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. 0000069993 00000 n Vehicle overheating One of the first symptoms that is commonly associated with a bad or failing fan clutch is an overheating engine. Symptoms of a Bad or Failing Fan Clutch | YourMechanic Advice 0000057354 00000 n Throw away the ruined newspaper Rev the engine, you should notice that the fan increases speed, but not proportionally to the crank speed. I just checked, and yes the speed increase and decrease with rpm. So you suspect that your fan clutch is defective. We use cookies and similar web technologies to recognize your repeat website visits and preferences and to analyze traffic. It relies on temp sensor to detect temperature and send signals through ECM/ECU and switches the clutch fan to different levels accordingly. 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. 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! CV fan clutches are part of a vehicle's engine cooling system and used to cool the engine by regulating the fan speed At low or regular engine loads, the cooling airflow produced during driving is normally sufficient to dissipate heat from the radiator and work as an engine cooler. The fan clutch should be disengaged with no voltage applied. Your vehicles fan clutch is an often overlooked but important little partits responsible for gauging the temperature of the air passing through the radiator and keeping the engine from overheating. Most clutches will fade with time as spring-type clutches lose thermal sensitivity and fluid-filled clutches lose fluid viscosity. If it feels rough or does not turn then replace the drive. 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. I only found it while trying to force it to overheat. Check the assembly for leaks through the seams and around the shaft. 1. hbbd``b`:$@. 0 A little heat is a good thing, improving fuel vaporization, performance, and fuel economy it also warms up the cabin in the winter. 0000070596 00000 n "By perseverance, study, and eternal desire, any man can become great." Wire check - See if the wire to ECU is normal, 4. GMTNation.com uses SSL to secure all traffic between our server and your browsing device. My issue was the fan would only engage intermittently using the Tech 2 and commanding full engagement. It disengaged once at 206 degrees, another time at 217 degrees but sometimes it stays engaged. gave the two in question a little twist with a fine nosed pliers. A viscous fan clutch contains a thick fluid that can leak from the unit. How to test the electro-viscous fan clutch | GMTNation 0000052661 00000 n As a result, you may think that your fan clutch has seized. I'm open to ideas. By landing on this page, were guessing you know exactly what one does: This is what a fan clutch does, if youre unsure. If necessary, use the hood strut to hold the hood up so you can work unobstructed. The fan clutch experts at Kit Masters can help you identify your fan so that you can determine the correct replacement. A bit obvious, but make sure to check the engine management system on your vehicle before anything else. If it spins more than three full rotations, this indicates that it may be prone to slipping. Warning: This post may contain misspelling, grammatical errors, disorganized sentence structure. Thank u LB. Were kidding of course. )Qo8Ni{Im'Ur$z3-XfLdE1c=e/ n4 a#I63px&LW42C`?c+fO~ lM |}&&`z`x7tv}3l6yUoo7~0EoeYf eh80/ar;)B]T# Fan Clutch Failure Modes and Troubleshooting | GMB Blog 0000037348 00000 n 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. If the ground breaks it's the same. Engine overheating at low speed or when stopped is the most-common fan clutch failure symptom. Viscous Fan Clutch. Not everyone has a scanner that can command the fan clutch. An overheating engine could literally weld itself into scrap metal. The sensor returns a signal pulse through the cooling fan speed signal circuit. 1 hz on the cooling fan speed signal circuit equals about 1 rpm of actual fan speed. (The previous clutch had loose bearings.) this will apply to T1N sprinters as well as NCV3 equipped with a. 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. A noisy, constant droning noise from the fan. y8#870S9sA1\ Then let it get hot. JavaScript is disabled. this is a brief video to show a simple diagnostic test to see if you have a fan clutch that has failed to produce torque. This means that the fan should power down at higher speeds because the rushing air is sufficient for cooling the engine. hb```c``Jg`e`fgc@ >(GCPa J0 A slipping fan clutch can result in failed cooling, increased engine strain, and poor fuel efficiency, which is why its important to evaluate the condition your vehicles fan clutch if you suspect it might be wearing out. 3000000/10000 Quick tutorial on how to refill your viscous fan clutch with proper fluid and reseal the chamber. 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. No CEL. I replaced it earlier this year while chasing an overheating condition (along with the Water Pump and Thermostat). 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). Viscous fan drives | Variable speed fan clutch Horton VMaster Ultra (Stratis) Viscous Fan Drive Troubleshooting Guide Engine feature code 12THX GENERAL OPERATION (ALL ENGINES) Horton VMaster is a variable speed drive. One of two conditions is possible. Tuning and Understanding your Toyota Viscous Fan Clutch Stopped with rag pushed in for a few minutes but couldnt see any temp rise, with air on, but its 55F here. Subject: Troubleshooting Vehicles Equipped with Viscous Fan Drives Qualify by assuming the vehicle to be in OEM condition. Fan Clutch A/C Problems. | Cummins Diesel Forum Identify Your Viscous Fan Clutch If you are unable to find a part number on your viscous fan clutch, our easy-to-use fan clutch identification system will walk you through the process of measuring it to determine the proper replacement. When the fan clutch engages, it spins up greatly, increasing air flow through the radiator and over the engine. Yes, the one in this video is bad. 0000060995 00000 n I replaced it earlier this year while chasing an overheating condition (along with the Water Pump and Thermostat). If an open or shorted condition has developed in the electronically controlled viscous fan clutch circuit, a Diagnostic Trouble Code (DTC) can be set. ~HO8$/` qAXwx$XA, uHfX m@;d;Hh22Ig 7Ya The fan clutch won't dis engage. Consider the symptoms listed above and be aware of potential failure. All proceeds go to supporting the site. Very good info on the function of the EV Clutch however, the quick function test requires a Tech 2. One (of many) of my top things to do is service the Transmission. Most fan clutches on newer vehicles are designed with a metal spring coil that reacts to changes in temperature and engages or disengages the fan accordingly. Viscous Fan Clutch Operation Symptoms - FreeASEStudyGuides.com To learn more about cookies, including steps for disabling, view our Privacy Policy. ELK\KHA(gYIm|eTjQ Gb$cqla7?Nf$77X!ry~1h1,amo 2jI&zI? Z;:QJ-uvgMq4Z(*n *ER"Mvz. PDF Ec450tm Electromagnetic Fan Clutch (Standard and Compact Styles startxref It was a junkyard unit off an 03 Envoy. Set the Viscous Fan Clutch Not Working and Troubleshoot Guide Alternatively, an optical tachometer can be used to measure fan speed. There is a very easy way to test the fan clutch for staying fully engaged all the time. Ed Beery is an Automotive Specialist and the Owner of InTechgrity Automotive Excellence based in Denver, Colorado. They contain a drive and driven plate with annular grooves that fill with a thick viscous silicon fluid. Please note, comments must be approved before they are published, Solenoid coil / Actuator unable to rotate, When the engine is in low temperature or in capacity, the clutch is separated, fan speed rotates at low speed, When the engine is at high capacity and the water temperature rises, the clutch coupled and rotate together, the fan rotates at high speed, When water temperate reach designated low temperature, the clutch reverts back to separated state, The ECU will detect temperature via water temp sensor and operate accordingly. Locked-in fan clutch symptoms. I just joined today and been digging into whether I should replace EV on 2004 Buick Rainier 5.3. At a stop, though, because the fan clutch doesn't engage and air isn't forced through the radiator, the engine can't dissipate excess heat. The PCM never puts it to 100%, 90% is the highest and that's at very high engine temps. The fan won't roar. I'm open to ideas. `han_aHS{%2hp\MJXB (o_ya;b'aT^)s,_8<9|J]ba[||T-=%9k8^q+dzn.fmUO~7t~4=FiSuY>Q0? Engine fan check - See if any damages on fan 2. Fan Clutch. Also when I first press the gas pedal it seems like the engine wants to stall which is probably something totally different? 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. You can also perform this test while the vehicle is parked and in neutral gear. Could not find any bad wires, just looseness in the actual pins inside the connector. 2004-12-07T10:24:41-05:00 Technical Services (UK) Ltd trading as Viscofans. If your unit has one, keep an eye on the temperature so youll know about when the fan speed should begin ramping up. Fan Clutch Symptoms of a Locked-in Fan Clutch. Short of a relay sticking, I see no possible cause that it would be electrical. My fan seems to run fast all the time but not loud like the jet engine i've read about. The engine temp reads a little low all the time, about 2-3 notches below 210. Electric cooling fan clutch. | The Truck Stop Thanks to all authors for creating a page that has been read 118,630 times. 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. If the air flow feels suspiciously hot or weak, it could just be a bad vent. If it feels the same, then I would assume the clutch is done. rS&cD5Ts6'E7FdU()8GHVe*9:IJWXYZftugvwhijxyz i !1AQa"q2#BR 3br$Csc%4S5&DTdEU' (The previous clutch had loose bearings.) The fan needs to operate within the limits at each test point.The fan should engage and remain engaged during the entire engagement request. Coolant temperature sensor circuit problems can set a DTC. Will go feel it again. Mack truck 2014 cxu613 mp8 .i replaced clutch fan controlled by air solenoid but now fan kick in 180 f till drops temp 150f on hill at high load.scr derating sign shows into dash but there is . see page 3 of the GM Techlink Document I have attached. As you could imagine, trying to stop a locked fan with a rag would not be a pleasant experience. Normally it's caused by faulty clutch fan, Possible Cause: Clutch fan wire got cut/pulled by foreign factors. So, youve noticed some, or all, of the symptoms above and think a possible culprit could be a locked-in fan clutch. Most truck fan clutches will fail-safe in this instance (i.e. 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. If you still need assistance, contact our customer service team at (800) 810-9110. We had a few overheating issues at Bremer Bay Why is it overlooked? 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. I think its doing what u r saying, just hard to tell how hard it should be trying to pull out of hand. When I say it disengages, I mean it coasts to a stop! 0000001421 00000 n By clicking Accept All Cookies, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts. Here, you can see where the fan and fan clutch are driven by the engine. Check for closed winterfront. uuid:2ce534b2-d8a3-11d8-a54e-a63691f3af4c hks8>Gw3Lg^Y By clicking I Accept on this banner you consent to the use of cookies unless you disable them. If the noise from the engine is too loud, try popping the hood to prevent the sound from being muffled. 0000049755 00000 n One last thing, check the wiring, especially at the clutch connector to ensure there are no broken wires. If you have difficulty rotating or it's just stuck, then it could be either foreign object or clutch fan. 0000066928 00000 n If not, it's defective. You are also talking to people that have been doing this for a while on this platform. Like all viscous fan clutches it may be turning, but is it working correctly? xref Read more! adobe:docid:photoshop:2ce534b1-d8a3-11d8-a54e-a63691f3af4c <<59055635F8F5FE459E851E498E113946>]/Prev 686576>> 0 These fans are more efficient than flex fans that are controlled by engine speed instead of temperature. 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. Original fan and water pump. Anyone seen a case where the EV Fan Clutch DISENGAGES completely? 450 Roaring. 0000002090 00000 n Now somethimes it only gets to halfway to 210, even in the summer. This fluid's flow is regulated by a bi-metallic spring that opens and closes a control valve. 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.
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