How to test the electro-viscous fan clutch | GMTNation 2625 Engine overheating at low speed or when stopped is the most-common fan clutch failure symptom. The fan clutch is responsible for controlling the operation of the cooling fans. 0000036305 00000 n Fan clutch have a patented System Sentry, which goes about as an early cautioning fuse to alarm the administrator. This is because the clutch will seem to be in perfect working order, as the fault is on the inside. For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. 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. You are using an out of date browser. It was a junkyard unit off an 03 Envoy. A bad fan clutch can cause engine problems like excessively high temperatures and poor performance. Viscous fan clutches are belt-driven and found on many older rear-wheel-drive passenger cars. No CEL. Roaring. Yes, the one in this video is bad. As you could imagine, trying to stop a locked fan with a rag would not be a pleasant experience. Inspecting the Fan Clutch Manually Download Article 1 Pop the hood. This fluid's viscosity is measured in CST or centistokes and degrades over time. Benjamin Jerew is an ASE-certified Master Automobile Technician with over a decade of experience in auto repair, maintenance, and diagnosis. 0000002090 00000 n Symptoms of a Bad or Failing Fan Clutch | YourMechanic Advice The newest viscous drives also feature Cold-Start Disengagement, which can help trucks and agricultural tractors warm up faster during cold conditions. Wire check - See if the wire to ECU is normal, 4. Luckily, there are a few symptoms you can look for to diagnose whether the fault is a seized fan clutch or not. Check the assembly for leaks through the seams and around the shaft. It relies on temp sensor to detect temperature and send signals through ECM/ECU and switches the clutch fan to different levels accordingly. - GENERAL GEORGE S. PATTON. 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 Never attempt to inspect or handle any of the mechanical components in the engine compartment while the engine is running. For a better experience, please enable JavaScript in your browser before proceeding. Engine fan consume the largest portion of the energy supply from the engine, up to 10%. When I say it disengages, I mean it coasts to a stop! 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. HWyTSW; * 1d!y ZmK*8gA:s9hG{F;3U9Q]DMNDIBM. Due to their control by the engine computer, they don't experience air leaks. Throw away the ruined newspaper Rev the engine, you should notice that the fan increases speed, but not proportionally to the crank speed. %PDF-1.4 % The fan needs to operate within the limits at each test point.The fan should engage and remain engaged during the entire engagement request. As engine temperature increases, look for a sudden jump in fan speed. There is a very easy way to test the fan clutch for staying fully engaged all the time. For more information about ASE, visit the official ASE website at www.ase.com, Copyright 2008-2023 All Rights Reserved Privacy Policy Disclaimer Sitemap. AC little warm. Electronic-Viscous Fan Clutch Troubleshooting During engine start up, the EV fan clutch will engage and match engine speed for up to 3 minutes. May daughters use it now. If the fan still hasnt kicked in by the time temperature reaches about 200F (93C), you can be sure that theres a problem somewhere. I released it and it took about 30 sec to a minute to get back up to speed and then I heard it engage and spin faster. Resurrecting this old thread. 6.7 cooling fan problem | Ford Powerstroke Diesel Forum 1988467. 57 0 obj <>stream Tuning and Understanding your Toyota Viscous Fan Clutch The fan clutch unit is approximately 1 foot tall by 1 foot wide. It should turn smoothly with some drag. Fan Clutch A/C Problems. | Cummins Diesel Forum I only found it while trying to force it to overheat. 0000025483 00000 n Stopped with rag pushed in for a few minutes but couldnt see any temp rise, with air on, but its 55F here. No one enjoys a vehicle or application breaking down: No one. Viscous fan hub; is yours working as it should? - 4WDing Australia If an open or shorted condition has developed in the electronically controlled viscous fan clutch circuit, a Diagnostic Trouble Code (DTC) can be set. 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. '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. Inside the fan clutch, there is a small reservoir filled with a viscous silicone-based oil. that did the trick. A 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. Here's a list of the most common fan clutch noises and what each one could mean: 1. Fan Clutch. 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. It will regulate engine temperatures more efficiently compared to older direct fuel injection engine models. This fluid's flow is regulated by a bi-metallic spring that opens and closes a control valve. To learn more about cookies, including steps for disabling, view our Privacy Policy. Right when it stop it tried to "tick" forward as I was holding it. A locked-in, or seized, fan clutch can cause radiator fans to fully engage at all speeds. Even when the drive is off the fan will spin between 50-300 rpm. Wire check - See if the wire to ECU is normal 4. Ed and the InTechgrity Automotive Excellence Team are approved by the American Automobile Association (AAA) for repairs and are Automotive Service Excellence (ASE) certified. There are 7 references cited in this article, which can be found at the bottom of the page. Consider the symptoms listed above and be aware of potential failure. http://www.popularmechanics.com/cars/how-to/a302/1772922/, http://www.offroaders.com/tech/fan-clutch.htm, https://itstillruns.com/test-fan-clutch-5086903.html, https://www.2carpros.com/articles/how-a-clutch-fan-works, http://www.aa1car.com/library/cooling_fan_clutch.htm, https://club.autodoc.co.uk/magazin/how-to-check-the-engine-cooling-fan, https://www.2carpros.com/articles/fan-clutch-removal. (The previous clutch had loose bearings.) Viscous fan drive technology Precise thermal management that does so much more than keep engines cool. Now somethimes it only gets to halfway to 210, even in the summer. Very good info on the function of the EV Clutch however, the quick function test requires a Tech 2. With more than eight years of experience, he specializes in providing maintenance and repair services for both individuals and companies. If necessary, use the hood strut to hold the hood up so you can work unobstructed. 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! When cruising, the vehicle moving through the air pushes air through the radiator, cooling the engine. VAT No. Solenoid coil / Actuator testor - Test solenoid coil / Actuator if you have an actuator tester. 0000030485 00000 n A cooling fan clutch is expected to fail over time. An overheating engine could literally weld itself into scrap metal. Check for closed winterfront. Like any other part, fan clutches can develop issues that, if left unchecked, can be both devastating and costly. These fans are needed at slow speeds, typically below 35 mph and at idle. OK. Fan Clutch Symptoms of a Locked-in Fan Clutch | Viscofans Found loose internal connections at the harness connector on the clutch and tightened them up a bit. 1AQ"aq2 #BR3$bC4% In our 97-98 AmTran REs, the 444s run 210* all the time, sometimes a little less in the winter, in the summer, the fans are almost constant on, and if it's hot enough (85-90* outside) they'll hit 230* under load. LEARN MORE >>. Common Fan Clutch Noises And What They Mean | GMB Blog PDF IK0900075 - Horton Stratis Fan Hub Diagnostics Page 1 of 13 Most clutches will fade with time as spring-type clutches lose thermal sensitivity and fluid-filled clutches lose fluid viscosity. )Qo8Ni{Im'Ur$z3-XfLdE1c=e/ n4 a#I63px&LW42C`?c+fO~ lM |}&&`z`x7tv}3l6yUoo7~0EoeYf eh80/ar;)B]T# 450 Original fan and water pump. Thank you. You are also talking to people that have been doing this for a while on this platform. This article has been viewed 118,630 times. Also when I first press the gas pedal it seems like the engine wants to stall which is probably something totally different? It's often compared to a jet engine. A new radiator fan and thermal fan clutch, ready to keep your engine cool. Any input would be appreciated. ` I've been trying to read as many of these waterpump/fan post as possible. Subject: Troubleshooting Vehicles Equipped with Viscous Fan Drives Qualify by assuming the vehicle to be in OEM condition. 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. By clicking I Accept on this banner you consent to the use of cookies unless you disable them. A binding fan clutch will typically be accompanied with warm air flow from the A/C, since the fan isnt turning the way it should be. %%EOF Most truck fan clutches will fail-safe in this instance (i.e. o! 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. Quick tutorial on how to refill your viscous fan clutch with proper fluid and reseal the chamber. will continue at full speed if the electrical circuit is faulty). It disengaged once at 206 degrees, another time at 217 degrees but sometimes it stays engaged. The fan won't roar. 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. Check All Cooling System Components Radiator, water pump, thermostat, temperature gauge, fault codes, etc. . 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. Hope you don't mind me referencing your video? 0000002179 00000 n We use cookies to make wikiHow great. Check Mechanical Integrity of Clutch With engine off, rotate fan by hand. If it feels rough or does not turn then replace the drive. These fans are more efficient than flex fans that are controlled by engine speed instead of temperature. PDF Subject: Troubleshooting Vehicles Equipped with Viscous Fan Drives `han_aHS{%2hp\MJXB (o_ya;b'aT^)s,_8<9|J]ba[||T-=%9k8^q+dzn.fmUO~7t~4=FiSuY>Q0? 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. 1 hz on the cooling fan speed signal circuit equals about 1 rpm of actual fan speed. Time for a Radiator-Heater Core Flush? 0000052661 00000 n 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. Suggestion: Clutch fan isn't the source of the issue. Viscous Fan Clutch | Kit Masters I feel like I reset something because I've never seen it go slow then engage. Then let it get hot. This is considered normal and may last more than 3 minutes in cooler climates or at lower driving speeds resulting in fan roar. Make sure your new fan clutch is the same type as the original. If the clutch is constantly engaged, the vehicle will suffer from poor gas mileage and loss of horsepower. I dont want to go near the fan and try and stop it. If your fan clutch has gone bad, replace it as soon as possible to prevent engine damage. Ed Beery is an Automotive Specialist and the Owner of InTechgrity Automotive Excellence based in Denver, Colorado. Company No. Always check for manufacturer's specifications for any special procedures. How to test a fan clutch - YouTube If you still need assistance, contact our customer service team at (800) 810-9110. 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. Get Started > Always in stock 0000035192 00000 n Vehicle overheating One of the first symptoms that is commonly associated with a bad or failing fan clutch is an overheating engine. When this happens, many of the symptoms described above can be experienced. When I say it disengages, I mean it coasts to a stop! xref 0000069624 00000 n adobe:docid:photoshop:f99bcbb8-4863-11d9-b0f7-b8eb50f766bb 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. Here, you can see where the fan and fan clutch are driven by the engine. 77 0 obj <>stream They also have a thermostatic spring. Solenoid coil / Actuator check - Try rotating solenoid coil / actuator and see if it's stuck 5. hb```c``Jg`e`fgc@ >(GCPa J0 3000000/10000 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. How to Test a Fan Clutch: 11 Steps (with Pictures) - wikiHow Next, locate the fan clutch bolted to the water pump in the engine compartment. 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. One smart strategy is to have your vehicles fan clutch and water pump replaced together. Now somethimes it only gets to halfway to 210, even in the summer. 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 Develop the tech skills you need for work and life. 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. A failing fan clutch could leave you stranded with expensive repair bills, so pay attention to these symptoms. You do realize that you are posting things that don't work for the everyday person trying to figure out his problem. If the air flow feels suspiciously hot or weak, it could just be a bad vent. Squeaks while doing it too. I fixed the pictures in my thread. DIY: Viscous Fan Clutch - Silicone Oil Refill - YouTube All Tsab 36K views 4 years ago How to know if. 42 0 obj <> endobj In most cases, fan blades are designed to flex up to. y8#870S9sA1\ Perhaps the Heat Soak cannot get carried away because things may have gotten a bit "sluggish" inside of the radiating units? DT Has the waterpump bearing seized around the fan shaft? E&OE All information displayed on this website is correct at the time of publication but is subject to change. 2021 Viscofans. By . %%EOF If it doesn't change, it's toast. I keep using it as an example on how to test the fan so thought it would be prefect for this article. Resurrecting this old thread. 0000021244 00000 n Global Parts Distributors has the electronic fan clutch assembly: part number 2911297. When a leak occurs, it's at the bearing seal, at the center rear of. Short of a relay sticking, I see no possible cause that it would be electrical. 0000052838 00000 n 0000069993 00000 n Honestly, that sounds like normal behavior to me. B=uJqc-I]-Y;6?VGx#qL.Vb&3Lv.EA5NYH$9&V=%n" 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. tt4*ittd830z02OL0 p A small amount of resistance always keeps the fan spinning, but its basically free-wheeling until the fan clutch engages. 0000001895 00000 n 0000001551 00000 n Thank u LB. Fan Clutch Symptoms of a Locked-in Fan Clutch. this will apply to T1N sprinters as well as NCV3 equipped with a. Solenoid coil / Actuator check - Try rotating solenoid coil / actuator and see if it's stuck, 5. Fan Clutch Replacement - Popular Mechanics It was a junkyard unit off an 03 Envoy. Like all viscous fan clutches it may be turning, but is it working correctly? 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. 0000035283 00000 n These issues will draw the PCM's attention, and it will turn on the check engine light to warn you about them. No CEL. Squeaks while doing it too. 0000060846 00000 n Simply follow the steps below and you rill receive a replacement part number. Engine fan check - See if any damages on fan, 2. Coolant temperature sensor circuit problems can set a DTC. The fan clutch is integral to the safe and efficient operation of your commercial vehicle or application engine. This includes heavy- and medium-duty trucks, agricultural tractors, vocational and specialty vehicles. When the fan clutch engages, it spins up greatly, increasing air flow through the radiator and over the engine. The fan clutch experts at Kit Masters can help you identify your fan so that you can determine the correct replacement. gave the two in question a little twist with a fine nosed pliers. If fan speed is not detected a DTC will be set. Success stories from users of variable-speed cooling solutions. adobe:docid:photoshop:2ce534b1-d8a3-11d8-a54e-a63691f3af4c There is an air leak in the fan drive. A viscous fan clutch contains a thick fluid that can leak from the unit. It would definitely do damage. The oil flows to and from the main chamber as engine heat fluctuates, engaging and disengaging the clutch. Listen out for a gentle roar from the fan clutch when youre driving at least 50 miles per hour, as this can indicate that its binding or locking up. The fan fault is logged in your engine management system. Identify Your Viscous Fan Clutch. Very interesting info and could be useful to anyone that has a scope and/or high end scanner or Tech 2. Okay, so in your other post to me about testing it you say that the one in this video is bad. By using our site, you agree to our. 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. 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. If the ground breaks it's the same. I'm open to ideas. EC450TM Fan Clutch NOTE Do not loosen the P-clamp attaching the wiring harness to the metal tab on the Fan Clutch. I went out and started up the truck and the fan was spinning FAST. 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.
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viscous fan clutch troubleshooting