I just checked, and yes the speed increase and decrease with rpm. References. With more than eight years of experience, he specializes in providing maintenance and repair services for both individuals and companies. Even if I pull the relay or unplug the fan it still runs fast. 0000060995 00000 n You are using an out of date browser. Success stories from users of variable-speed cooling solutions. 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. Then test the fan clutch by giving it a good push. that did the trick. This means that the fan should power down at higher speeds because the rushing air is sufficient for cooling the engine. The fan needs to operate within the limits at each test point.The fan should engage and remain engaged during the entire engagement request. If you end up in full lock, the thing is somehow getting a constant positive, the pcm should see that and set a light because its command and actual are different. They contain a drive and driven plate with annular grooves that fill with a thick viscous silicon fluid. 0000001016 00000 n Possible Cause: Damaged engine fan usually caused by friction, wear or entry of foreign objects. Search by part number to find a replacement for your fan clutch. The PCM supplies a 5-volt reference and a low reference to the Hall effect sensor. Normal solenoid coil electric current should be 40mA to 60mA. It would definitely do damage. It should turn smoothly with some drag. 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. If you still need assistance, contact our customer service team at (800) 810-9110. Like any other part, fan clutches can develop issues that, if left unchecked, can be both devastating and costly. I fixed the pictures in my thread. endstream endobj 45 0 obj 216635 endobj 46 0 obj<>stream No one enjoys a vehicle or application breaking down: No one. These fans are needed at slow speeds, typically below 35 mph and at idle. For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. The actual fan speed should be approx - 250 RPM of desired.. There are 7 references cited in this article, which can be found at the bottom of the page. So, youve noticed some, or all, of the symptoms above and think a possible culprit could be a locked-in fan clutch. Suggestion: See if there's any foreign object stuck on clutch fan, if any foreign objects absent, then it is likely the clutch fan. Viscous fan drive technology Precise thermal management that does so much more than keep engines cool. 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. 0000049755 00000 n By using our site, you agree to our. Install the Horton EC450 TM Fan Clutch on the engine. adobe:docid:photoshop:f99bcbb8-4863-11d9-b0f7-b8eb50f766bb 2004-12-07T12:21:43-05:00 Get Started > Always in stock The pwm feed is positive so if that breaks it defaults to unlocked. %%EOF Not everyone has a scanner that can command the fan clutch. Appreciate the help. It's often compared to a jet engine. While youre at it, consider the performance and fuel economy benefits of upgrading to electric cooling fans. 0000014403 00000 n 2 Engine still runs great! Time for a Radiator-Heater Core Flush? the cooling fan using a Hall effect sensor, which reads a reluctor track inside the fan clutch. Benjamin Jerew is an ASE-certified Master Automobile Technician with over a decade of experience in auto repair, maintenance, and diagnosis. 42 0 obj <> endobj My issue was the fan would only engage intermittently using the Tech 2 and commanding full engagement. Vehicle overheating One of the first symptoms that is commonly associated with a bad or failing fan clutch is an overheating engine. 0 This is considered normal and may last more than 3 minutes in cooler climates or at lower driving speeds resulting in fan roar. The one in this video is bad? We are working every day to make sure our community is one of the best. One last thing, check the wiring, especially at the clutch connector to ensure there are no broken wires. Once viscous fluid is in the working chamber, shearing of the fluid results in fan rotation. 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. Viscofans is in no way affiliated to any of the brands shown on this site. One (of many) of my top things to do is service the Transmission. 2625 Locked-in fan clutch symptoms. 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. 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. 0000053141 00000 n The fan clutch should be disengaged with no voltage applied. 0000066631 00000 n 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. 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. 57 0 obj <>stream I dont want to go near the fan and try and stop it. If the fan still hasnt kicked in by the time temperature reaches about 200F (93C), you can be sure that theres a problem somewhere. This article has been viewed 118,630 times. Last Updated: August 7, 2022 Roaring. Firstly, check to make sure something hasnt gotten caught or wrapped up around the back of the viscous fan clutch. Fan clutch have a patented System Sentry, which goes about as an early cautioning fuse to alarm the administrator. The newest viscous drives also feature Cold-Start Disengagement, which can help trucks and agricultural tractors warm up faster during cold conditions. %PDF-1.4 % 0000001421 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. 0000052661 00000 n It will also set a code if the fan clutch is not running at the set RPM - too slow or too fast. Shows the signals to and from the the fan and how the fan operates when commanded by the PCM and the scanner. Perhaps the Heat Soak cannot get carried away because things may have gotten a bit "sluggish" inside of the radiating units? We recommend that you check the transducer and fan clutch assembly. Like all viscous fan clutches it may be turning, but is it working correctly? Now somethimes it only gets to halfway to 210, even in the summer. Check the assembly for leaks through the seams and around the shaft. I went out and started up the truck and the fan was spinning FAST. >Vyzy{=sUt\z^{W{7^sU:GWEzz5x=^s^[=^s+^o=^s{O=:y{^o==r. By clicking I Accept on this banner you consent to the use of cookies unless you disable them. The wires run in a rubber hose in front of the fan. It does not function like an on/off drive. The fan clutch won't dis engage. uuid:2ce534b2-d8a3-11d8-a54e-a63691f3af4c 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. The fan clutch experts at Kit Masters can help you identify your fan so that you can determine the correct replacement. If an open or shorted condition has developed in the electronically controlled viscous fan clutch circuit, a Diagnostic Trouble Code (DTC) can be set. All Tsab 36K views 4 years ago How to know if. When it happens its especially hard to take when you need your vehicle or application to finish a job. This fluid's flow is regulated by a bi-metallic spring that opens and closes a control valve. (The previous clutch had loose bearings.) It disengaged once at 206 degrees, another time at 217 degrees but sometimes it stays engaged. These fans are needed at slow speeds, typically below 35 mph and at idle. By signing up you are agreeing to receive emails according to our privacy policy. Due to their control by the engine computer, they don't experience air leaks. I've been trying to read as many of these waterpump/fan post as possible. 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). I just repaired a electro viscous clutch today on my 02 TrailBlazer. 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 hb```"wVF/3 1K6l|Z+W9"qHg6Engl!z,A& qx3h9@ -Vb5$?%?@,#Xj~aXSFe40hXmW{|o\ s2WIp?k2pUiF 0 gA Customer Question. Engine belt stuck on clutch fan, causing solenoid coil/actuator unable to rotate, 1. Troubleshooting Common Condenser Fan Problems, Signs and Symptoms of Spark Plug Problems, Reasons Why Your Car's Idle Speed Might Be Too High, Engine Ignition and Cam Timing for the Novice, Troubleshooting Engine Driveability Problems: Surging or Misfiring. I'm open to ideas. A viscous fan clutch contains a thick fluid that can leak from the unit. 1. It may work at 100% but maybe not at 20-30%. 0000049576 00000 n Advantages of variable-speed fan drives that use viscous technology, LA Sanitation increases uptime and driver comfort, Solving overcooling problems for generators in cold weather, Maximizing uptime and efficiency for heavy haulers, Viscous drive boosts Canadian heavy equipment supplier's value, 1,100-truck fleet parts manager: Viscous drives 'have worked flawlessly', Optimized cooling means more power to vehicle's wheels, Decreased particulate matter release/lower CO2 emissions, Faster engine and cab warmupwithCold-Start Disengagement. 1 hz on the cooling fan speed signal circuit equals about 1 rpm of actual fan speed. When the engine is off, there are a few things you can do to check the fan clutch: The internal combustion engine generates a lot of heat, which the engine cooling system is tasked with moderating. )Qo8Ni{Im'Ur$z3-XfLdE1c=e/ n4 a#I63px&LW42C`?c+fO~ lM |}&&`z`x7tv}3l6yUoo7~0EoeYf eh80/ar;)B]T# 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. Check it by releasing it from its seat and measuring the distance between the spring and its retainer. The fan clutch should always engage when the system head pressure reaches in the 240 to 270 lbs range. 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. "By perseverance, study, and eternal desire, any man can become great." 14 0 obj <> endobj The sensor returns a signal pulse through the cooling fan speed signal circuit. OK. No CEL. A bad fan clutch can cause engine problems like excessively high temperatures and poor performance. -Determine if the fault is mechanical or electrical(and then follow the appropriate troubleshooting steps) . If fan speed is not detected a DTC will be set. A viscous fan clutch enables the fan to more or less freewheel . There is a very easy way to test the fan clutch for staying fully engaged all the time. Make sure your new fan clutch is the same type as the original. 42 36 By . LEARN MORE >>. Viscous drives tend to have the first two issues. A noisy, constant droning noise from the fan. trailer Solenoid coil / Actuator check - Try rotating solenoid coil / actuator and see if it's stuck, 5. Thank you. Thanks to all authors for creating a page that has been read 118,630 times. The oil flows to and from the main chamber as engine heat fluctuates, engaging and disengaging the clutch. 0000002179 00000 n This animation of Horton's latest variable-speed fan drive, the LCX, shows viscous cooling technology in action. ()*6789:FGHIJVWXYZefghijtuvwxyz ? These issues will draw the PCM's attention, and it will turn on the check engine light to warn you about them. I think its doing what u r saying, just hard to tell how hard it should be trying to pull out of hand. When this happens, many of the symptoms described above can be experienced. Now what? Very interesting info and could be useful to anyone that has a scope and/or high end scanner or Tech 2. Possible Cause: Try rotating the bottom part (solenoid coil / actuator) with hand. Throw away the ruined newspaper Rev the engine, you should notice that the fan increases speed, but not proportionally to the crank speed. Set the Okay, so in your other post to me about testing it you say that the one in this video is bad. Global Parts Distributors has the electronic fan clutch assembly: part number 2911297. No CEL. For more information about ASE, visit the official ASE website at www.ase.com, Copyright 2008-2023 All Rights Reserved Privacy Policy Disclaimer Sitemap. DT It is possible something like a plastic bag could have got wound up where the shaft goes in to the bearing. Squeaks while doing it too. Viscous fan clutches are belt-driven and found on many older rear-wheel-drive passenger cars. The "drive disc" and the "front half" share these closely spaced rings. It may not display this or other websites correctly. I am going to do a re test of mine, I think it is bad and I want to be sure. Fan Clutch. 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 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? As you could imagine, trying to stop a locked fan with a rag would not be a pleasant experience. Company No. To learn more about cookies, including steps for disabling, view our Privacy Policy. This is because the clutch will seem to be in perfect working order, as the fault is on the inside. Give us some info about your project, and a Horton rep will contact you. 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. Inside the fan clutch, there is a small reservoir filled with a viscous silicone-based oil. As a result, you may think that your fan clutch has seized. If the clutch is constantly engaged, the vehicle will suffer from poor gas mileage and loss of horsepower. When a pneumatic fan clutch fails, it's likely one of three symptoms is present: The clutch won't engage. will continue at full speed if the electrical circuit is faulty). Electronic-Viscous Fan Clutch Troubleshooting. Always check for manufacturer's specifications for any special procedures. All rights reserved. Resurrecting this old thread. I agree, a T444E will get hot easily unless cooled well, so the fan clutch is critical. Squeaks while doing it too. They contain a drive and driven plate with annular grooves that fill with a thick viscous silicon fluid. Hmmmmm.. that truck looks awfully familiar. [JieZ`$@v*v}F)RNf-=}#>c,kc^pv5!1iiFLTL" #XjtvFHb4uubu0.-lD_r,`e)W/H]S$G+h'uqq6`G#ogkGFr'E{G=J'{GGPvR(n Unit 6 Scandinavia CourtChain Bar RoadCleckheatonBD19 3QW UK. 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. We had a few overheating issues at Bremer Bay Why is it overlooked? All it does is freewheel and has no resistance. I just joined today and been digging into whether I should replace EV on 2004 Buick Rainier 5.3. Adobe Photoshop CS Windows Viscous Fan Clutch. %PDF-1.5 % There is an air leak in the fan drive. Anyone seen a case where the EV Fan Clutch DISENGAGES completely? wikiHow is where trusted research and expert knowledge come together. Thanks for the quick response. Warning: This post may contain misspelling, grammatical errors, disorganized sentence structure. Wire check - See if the wire to ECU is normal, 4. Viscous fan clutches are belt-driven and found on many older rear-wheel-drive passenger cars. 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. 450 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. . Equally frustrating is diagnosing the fault. 0000002090 00000 n One smart strategy is to have your vehicles fan clutch and water pump replaced together. 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. Sometimes a customer will complain about a roaring noise coming from the engine bay. Secondly, if your viscous fan hub is electronically controlled, check if the wire is unplugged or damaged. X Some fan clutches are designed with a built-in thermometer somewhere on the instrument panel. If not, it's defective. Most truck fan clutches will fail-safe in this instance (i.e. If the fan clutch is going bad or has failed, there are a couple of ways you may notice. 0000066928 00000 n We use cookies and similar web technologies to recognize your repeat website visits and preferences and to analyze traffic. During engine start up, the EV fan clutch will engage and match engine speed for up to 3 minutes. gave the two in question a little twist with a fine nosed pliers. Check the gauge for proper operation (especially electric gauges). This is true, especially if the fault is in the engine cooling system and youre unsure the fan clutch symptoms to look for. Its possible to upgrade from a non-thermal clutch to a more efficient thermal model, but not the other way around. Most clutches will fade with time as spring-type clutches lose thermal sensitivity and fluid-filled clutches lose fluid viscosity. One of two conditions is possible. Simply follow the steps below and you rill receive a replacement part number. A locked-in, or seized, fan clutch can cause radiator fans to fully engage at all speeds. Overheating constantly, in trafc and on long pulls Check the coolant level. By opening and closing the fluid port valve, the PCM controls the fan speed. When I say it disengages, I mean it coasts to a stop! 0000060378 00000 n Subject: Troubleshooting Vehicles Equipped with Viscous Fan Drives Qualify by assuming the vehicle to be in OEM condition. 0000037348 00000 n Too fast to try and slow it with a rag. Usually a bad or failing fan clutch will produce a few symptoms that can alert the driver of a potential issue. 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. 0000002273 00000 n Fan Clutch Symptoms of a Locked-in Fan Clutch. A failing fan clutch could leave you stranded with expensive repair bills, so pay attention to these symptoms. `han_aHS{%2hp\MJXB (o_ya;b'aT^)s,_8<9|J]ba[||T-=%9k8^q+dzn.fmUO~7t~4=FiSuY>Q0? 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 . 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 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. 1988467. When cruising, the vehicle moving through the air pushes air through the radiator, cooling the engine. Clutch fan check - See if any visible damage on clutch fan, 3. It will cost somewhere between $150-300 to have a new fan clutch installed, on average. 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 found this video by Scanner Danner where he's trying to diagnose a fan code. I'm open to ideas. It was a junkyard unit off an 03 Envoy. When the fan clutch engages, it spins up greatly, increasing air flow through the radiator and over the engine. The fan won't roar. &\cUj Has the waterpump bearing seized around the fan shaft? Thank you! They also have a thermostatic spring. 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. Electronic-Viscous Fan Clutch Troubleshooting During engine start up, the EV fan clutch will engage and match engine speed for up to 3 minutes. image/tiff 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. 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.
