One smart strategy is to have your vehicles fan clutch and water pump replaced together. g? AC little warm. 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. . Posted - 02/07/2008 : 5:47:26 PM. Due to their control by the engine computer, they don't experience air leaks. Honestly, that sounds like normal behavior to me. Here's a list of the most common fan clutch noises and what each one could mean: 1. 0000025483 00000 n Check to make sure each of the bolts holding the fan clutch in place is secure and intact. For a better experience, please enable JavaScript in your browser before proceeding. Inspecting the Fan Clutch Manually Download Article 1 Pop the hood. References. Roaring. This is true, especially if the fault is in the engine cooling system and youre unsure the fan clutch symptoms to look for. Virtually any on- or off-highway engine can benefit from viscous cooling technology. 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. I dont want to go near the fan and try and stop it. 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. A small amount of resistance always keeps the fan spinning, but its basically free-wheeling until the fan clutch engages. Registered in England. 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! Adobe d 450 If your unit has one, keep an eye on the temperature so youll know about when the fan speed should begin ramping up. Clutch fan check - See if any visible damage on clutch fan, 3. The sensor returns a signal pulse through the cooling fan speed signal circuit. Coolant temperature sensor circuit problems can set a DTC. Very good info on the function of the EV Clutch however, the quick function test requires a Tech 2. The oil flows to and from the main chamber as engine heat fluctuates, engaging and disengaging the clutch. If you still need assistance, contact our customer service team at (800) 810-9110. We use cookies to make wikiHow great. 1. It relies on temp sensor to detect temperature and send signals through ECM/ECU and switches the clutch fan to different levels accordingly. Global Parts Distributors has the electronic fan clutch assembly: part number 2911297. Then let it get hot. For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. Viscous fan clutch is going to be the norm when more industrial engine uses ECM/ECU. They also have a thermostatic spring. Ed and the InTechgrity Automotive Excellence Team are approved by the American Automobile Association (AAA) for repairs and are Automotive Service Excellence (ASE) certified. Engine fan check - See if any damages on fan, 2. 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. B=uJqc-I]-Y;6?VGx#qL.Vb&3Lv.EA5NYH$9&V=%n" 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. The fan clutch won't dis engage. <<59055635F8F5FE459E851E498E113946>]/Prev 686576>> 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. Initially I get a Trans Flush at Hello, everyone. Motorhomes and RVs | Engine cooling systems Front-wheel drive vehicles are equipped with a completely different cooling system due to the way the engine is configured. I just checked, and yes the speed increase and decrease with rpm. You do realize that you are posting things that don't work for the everyday person trying to figure out his problem. 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. Viscous Fan Clutch. A viscous fan clutch enables the fan to more or less freewheel . 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. Overheating constantly, in trafc and on long pulls Check the coolant level. that did the trick. this will apply to T1N sprinters as well as NCV3 equipped with a. If you want to determine the extent of the problem, you can use a probe thermometer to read the exact temperature of the air flowing through the radiator. Suggestion: Clutch fan isn't the source of the issue. &\cUj Too fast to try and slow it with a rag. The fan clutch unit is approximately 1 foot tall by 1 foot wide. By clicking I Accept on this banner you consent to the use of cookies unless you disable them. Could not find any bad wires, just looseness in the actual pins inside the connector. There is a very easy way to test the fan clutch for staying fully engaged all the time. The fan clutch should be disengaged with no voltage applied. 0000030485 00000 n When the fan clutch engages, it spins up greatly, increasing air flow through the radiator and over the engine. Paying attention to your vehicle is the first step in an accurate diagnosis, effective repair, and reliable vehicle. Consider the symptoms listed above and be aware of potential failure. For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. All it does is freewheel and has no resistance. Vehicle overheating One of the first symptoms that is commonly associated with a bad or failing fan clutch is an overheating engine. 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. Thank you! A roaring noise could mean a number of things, including a bad wheel bearing, worn tires, or a differential that's low on oil. My fan seems to run fast all the time but not loud like the jet engine i've read about. If you have difficulty rotating or it's just stuck, then it could be either foreign object or clutch fan. 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. All browsing and transactions within are secured by an SSL Certificate with high-strength encryption. '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. Fan Clutch Symptoms of a Locked-in Fan Clutch. DT When I say it disengages, I mean it coasts to a stop! 0000060995 00000 n As you could imagine, trying to stop a locked fan with a rag would not be a pleasant experience. This includes heavy- and medium-duty trucks, agricultural tractors, vocational and specialty vehicles. 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. 0000053141 00000 n It would definitely do damage. 1 hz on the cooling fan speed signal circuit equals about 1 rpm of actual fan speed. No one enjoys a vehicle or application breaking down: No one. This animation of Horton's latest variable-speed fan drive, the LCX, shows viscous cooling technology in action. Any input would be appreciated. If the clutch is constantly engaged, the vehicle will suffer from poor gas mileage and loss of horsepower. You are also talking to people that have been doing this for a while on this platform. The pwm feed is positive so if that breaks it defaults to unlocked. 0000069624 00000 n PDF Electronically Controlled Viscous Cooling Fan startxref xref I have a 2003 EXT 4WD Trailblazer 235,000 miles. Tuning and Understanding your Toyota Viscous Fan Clutch Adobe Photoshop CS Windows On the other hand, too much heat can be a big problem, melting non-metal engine parts and rendering lubricating oil useless. A cooling fan clutch is expected to fail over time. These fans are needed at slow speeds, typically below 35 mph and at idle. 1 0000069649 00000 n Check for closed winterfront. 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. %%EOF 2625 Get Started > Always in stock Viscous Fan Clutch | Kit Masters Were kidding of course. LEARN MORE >>. Also when I first press the gas pedal it seems like the engine wants to stall which is probably something totally different? Keep an eye out for any visible components that are bent, crooked, or missing. DIY: Viscous Fan Clutch - Silicone Oil Refill Pine Hollow Auto Diagnostics 450K views 7 years ago 1995-2004 Toyota Tacoma fan clutch rebuild. JavaScript is disabled. Squeaks while doing it too. Like all viscous fan clutches it may be turning, but is it working correctly? 3000000/10000 DIY: Viscous Fan Clutch - Silicone Oil Refill - YouTube 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. Inside the fan clutch, there is a small reservoir filled with a viscous silicone-based oil. see page 3 of the GM Techlink Document I have attached. Also verify no indication of viscous fluid leakage. Never attempt to inspect or handle any of the mechanical components in the engine compartment while the engine is running. As engine temperature increases, look for a sudden jump in fan speed. Horton VMaster Ultra (Stratis) Viscous Fan Drive Troubleshooting Guide Engine feature code 12THX GENERAL OPERATION (ALL ENGINES) Horton VMaster is a variable speed drive. 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. Fan Clutch. 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. Clutch fan check - See if any visible damage on clutch fan 3. Right when it stop it tried to "tick" forward as I was holding it. 0000035283 00000 n The fluid wears, rendering it incapable of grabbing the drive and driven plates and offer the gripping resistance needed to hold them together. 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? adobe:docid:photoshop:f99bcbb8-4863-11d9-b0f7-b8eb50f766bb How to Test a Fan Clutch | Hot Rod Forum Install the Horton EC450 TM Fan Clutch on the engine. We don't all go to a dealer to get work done right away. Quick tutorial on how to refill your viscous fan clutch with proper fluid and reseal the chamber. Clutch slipping and eventual failure are normal with time. If it spins more than three full rotations, this indicates that it may be prone to slipping. 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. 0000037348 00000 n I only found it while trying to force it to overheat. Thanks to all authors for creating a page that has been read 118,630 times. 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. Stopped with rag pushed in for a few minutes but couldnt see any temp rise, with air on, but its 55F here. If the fan still hasnt kicked in by the time temperature reaches about 200F (93C), you can be sure that theres a problem somewhere. 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. (The previous clutch had loose bearings.) I keep using it as an example on how to test the fan so thought it would be prefect for this article. No CEL. 0000001895 00000 n 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 o! These fans are needed at slow speeds, typically below 35 mph and at idle. I think its doing what u r saying, just hard to tell how hard it should be trying to pull out of hand. Swap the fan relay with another similar one in the fuse box (headlight IIRC) and see if the problem persists. %PDF-1.5 % Has the waterpump bearing seized around the fan shaft? These elements are natural in the process of Writing in a foreign language. 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. . the cooling fan using a Hall effect sensor, which reads a reluctor track inside the fan clutch. If an open or shorted condition has developed in the electronically controlled viscous fan clutch circuit, a Diagnostic Trouble Code (DTC) can be set. No CEL. If your fan clutch has gone bad, replace it as soon as possible to prevent engine damage. When a pneumatic fan clutch fails, it's likely one of three symptoms is present: The clutch won't engage. I am going to do a re test of mine, I think it is bad and I want to be sure. 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. 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. I feel like I reset something because I've never seen it go slow then engage. Last Updated: August 7, 2022 0000002090 00000 n We are working every day to make sure our community is one of the best. 0 2004-12-07T10:24:41-05:00 Check All Cooling System Components Radiator, water pump, thermostat, temperature gauge, fault codes, etc. Yes, the one in this video is bad. 42 36 How to test the electro-viscous fan clutch | GMTNation 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. 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 A failing fan clutch could leave you stranded with expensive repair bills, so pay attention to these symptoms. Perhaps the Heat Soak cannot get carried away because things may have gotten a bit "sluggish" inside of the radiating units? Engine belt stuck on clutch fan, causing solenoid coil/actuator unable to rotate, 1. uuid:2ce534b2-d8a3-11d8-a54e-a63691f3af4c Engine still runs great! 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 . y8#870S9sA1\ The engine temp reads a little low all the time, about 2-3 notches below 210. Like any other part, fan clutches can develop issues that, if left unchecked, can be both devastating and costly. Anyone seen a case where the EV Fan Clutch DISENGAGES completely? Check the gauge for proper operation (especially electric gauges). You should feel some tugging from the fan trying to get it going again. Viscous fan hub; is yours working as it should? - 4WDing Australia A properly-functioning fan clutch is critical to engine reliability, as it works to maintain a safe temperature range. If it doesn't change, it's toast. In most cases, fan blades are designed to flex up to. A little heat is a good thing, improving fuel vaporization, performance, and fuel economy it also warms up the cabin in the winter. Viscofans is in no way affiliated to any of the brands shown on this site. Viscous fan clutches are belt-driven and found on many older rear-wheel-drive passenger cars. From the exterior, a locked-in fan clutch will be hard to diagnose with just a visual check. Locked-in fan clutch symptoms. %PDF-1.4 % T444E overheat problems - School Bus Fleet Magazine Forums Time for a Radiator-Heater Core Flush? 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 They contain a drive and driven plate with annular grooves that fill with a thick viscous silicon fluid. Now what? The fan clutch experts at Kit Masters can help you identify your fan so that you can determine the correct replacement. Contact Whatsapp: +6012 879 3220 if you need any product! Its possible to upgrade from a non-thermal clutch to a more efficient thermal model, but not the other way around. How to test a fan clutch - YouTube Wire check - See if the wire to ECU is normal, 4. 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. 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. Thanks for the quick response. It may be a good idea to check the temperature of a few different vents. endstream endobj 45 0 obj 216635 endobj 46 0 obj<>stream PDF IK0900075 - Horton Stratis Fan Hub Diagnostics Page 1 of 6 6% Truck Repair; Viscus fan on MP8 MACK engine on all the time, happened. 0000021244 00000 n Identify Your Viscous Fan Clutch - Kit Masters 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. How to Tell If Your Fan Clutch Is Going Bad - LiveAbout You should probably slow your role a little and do more reading. Fan Clutches for Commercial Vehicles - SACHS - ZF Friedrichshafen These fans are more efficient than flex fans that are controlled by engine speed instead of temperature. The PCM never puts it to 100%, 90% is the highest and that's at very high engine temps. The one in this video is bad? %PDF-1.4 % 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. Check with diagnostic tool scanner - See if the readings reach the desired levels, 6. The fan clutch should always engage when the system head pressure reaches in the 240 to 270 lbs range. (The previous clutch had loose bearings.) Fan Clutch Symptoms of a Locked-in Fan Clutch | Viscofans During engine start up, the EV fan clutch will engage and match engine speed for up to 3 minutes. If not, it's defective. Luckily, there are a few symptoms you can look for to diagnose whether the fault is a seized fan clutch or not. By opening and closing the fluid port valve, the PCM controls the fan speed. Normally it's caused by faulty clutch fan, Possible Cause: Clutch fan wire got cut/pulled by foreign factors. Alternatively, an optical tachometer can be used to measure fan speed. 0000002179 00000 n This is because the clutch will seem to be in perfect working order, as the fault is on the inside. 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. 0000035192 00000 n PDF Subject: Troubleshooting Vehicles Equipped with Viscous Fan Drives Normal solenoid coil electric current should be 40mA to 60mA. 0000049755 00000 n Include your email address to get a message when this question is answered. To learn more about cookies, including steps for disabling, view our Privacy Policy. 2 0000036305 00000 n So you suspect that your fan clutch is defective. So, youve noticed some, or all, of the symptoms above and think a possible culprit could be a locked-in fan clutch. The fan fault is logged in your engine management system. 0000000016 00000 n It was a junkyard unit off an 03 Envoy. 0000008513 00000 n Electronic-Viscous Fan Clutch Troubleshooting. The engine temp reads a little low all the time, about 2-3 notches below 210. Give the water pump hose a quick jostle as well to see if the problem might lie there. If the fan clutch is going bad or has failed, there are a couple of ways you may notice. Will go feel it again. 0000060846 00000 n 3000000/10000 0000057354 00000 n When I said DO NOT TEST, that's with the method described with the rag. Possible Cause: Try rotating the bottom part (solenoid coil / actuator) with hand. A All proceeds go to supporting the site. Fan clutch have a patented System Sentry, which goes about as an early cautioning fuse to alarm the administrator. This means that the fan should power down at higher speeds because the rushing air is sufficient for cooling the engine. 0000052838 00000 n We use cookies and similar web technologies to recognize your repeat website visits and preferences and to analyze traffic. By . 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. When cruising, the vehicle moving through the air pushes air through the radiator, cooling the engine. Traces of oil are perfectly normal, and wont necessarily be an indication that your clutch is shot. One (of many) of my top things to do is service the Transmission. Make sure your new fan clutch is the same type as the original. Viscus fan on MP8 MACK engine on all the time, happened - JustAnswer VAT No. I went out and started up the truck and the fan was spinning FAST. 0000001551 00000 n Standard thermostatic fan clutches will only be present on cars and trucks with rear-wheel drive. The PCM supplies a 5-volt reference and a low reference to the Hall effect sensor. Engine fan check - See if any damages on fan 2. Engine fan consume the largest portion of the energy supply from the engine, up to 10%. I'm open to ideas. I'm open to ideas. hb```c``Jg`e`fgc@ >(GCPa J0 The fan needs to operate within the limits at each test point.The fan should engage and remain engaged during the entire engagement request. Some fan clutches are designed with a built-in thermometer somewhere on the instrument panel. HWyTSW; * 1d!y ZmK*8gA:s9hG{F;3U9Q]DMNDIBM. Has the waterpump bearing seized around the fan shaft? The info I posted regarding a locked clutch (beyond a few minutes) is still accurate. % of people told us that this article helped them. The "drive disc" and the "front half" share these closely spaced rings. 0000066631 00000 n
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