1988467. Truck Repair; Viscus fan on MP8 MACK engine on all the time, happened. This is because the clutch will seem to be in perfect working order, as the fault is on the inside. By using our site, you agree to our. uuid:2ce534b2-d8a3-11d8-a54e-a63691f3af4c A bit obvious, but make sure to check the engine management system on your vehicle before anything else. 0000049755 00000 n endstream endobj 45 0 obj 216635 endobj 46 0 obj<>stream We don't all go to a dealer to get work done right away. 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 Normally it's caused by faulty clutch fan, Possible Cause: Clutch fan wire got cut/pulled by foreign factors. 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 PCM supplies a 5-volt reference and a low reference to the Hall effect sensor. trailer But in the late 1950s, viscous fan clutches began to appear. It's often compared to a jet engine. I just checked, and yes the speed increase and decrease with rpm. Check it by releasing it from its seat and measuring the distance between the spring and its retainer. 42 0 obj <> endobj These fans are needed at slow speeds, typically below 35 mph and at idle. For more information about ASE, visit the official ASE website at www.ase.com, Copyright 2008-2023 All Rights Reserved Privacy Policy Disclaimer Sitemap. >Vyzy{=sUt\z^{W{7^sU:GWEzz5x=^s^[=^s+^o=^s{O=:y{^o==r. I think its doing what u r saying, just hard to tell how hard it should be trying to pull out of hand. It may be a good idea to check the temperature of a few different vents. All proceeds go to supporting the site. You should probably slow your role a little and do more reading. If you are getting that tugging, the clutch is working. Most truck fan clutches will fail-safe in this instance (i.e. Before you go looking for your fan clutch, make sure your vehicle is in park, with the engine off and the handbrake firmly engaged. References. [KpB0G8/F7Xl u@qLTAUzpT0F,)xb7J+%*u)EkZ2mJikWc[B, I have a 2003 EXT 4WD Trailblazer 235,000 miles. gave the two in question a little twist with a fine nosed pliers. Set the PDF Subject: Troubleshooting Vehicles Equipped with Viscous Fan Drives The 2 halves opened. tt4*ittd830z02OL0 p 1 hz on the cooling fan speed signal circuit equals about 1 rpm of actual fan speed. How to Test a Fan Clutch | Hot Rod Forum If the air flow feels suspiciously hot or weak, it could just be a bad vent. Search by part number to find a replacement for your fan clutch. will continue at full speed if the electrical circuit is faulty). I fixed the pictures in my thread. Engine belt stuck on clutch fan, causing solenoid coil/actuator unable to rotate, 1. Quick tutorial on how to refill your viscous fan clutch with proper fluid and reseal the chamber. Resurrecting this old thread. Ed and the InTechgrity Automotive Excellence Team are approved by the American Automobile Association (AAA) for repairs and are Automotive Service Excellence (ASE) certified. 0000060915 00000 n . 3000000/10000 This is true, especially if the fault is in the engine cooling system and youre unsure the fan clutch symptoms to look for. 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. GMTNation.com uses SSL to secure all traffic between our server and your browsing device. A cooling fan clutch is expected to fail over time. When this happens, many of the symptoms described above can be experienced. 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. 0000002090 00000 n When the fan clutch engages, it spins up greatly, increasing air flow through the radiator and over the engine. Fan Clutches for Commercial Vehicles - SACHS - ZF Friedrichshafen Check the gauge for proper operation (especially electric gauges). As fan clutch specialists, weve seen plenty of faulty viscous drives in our time. 0000030485 00000 n As a result, you may think that your fan clutch has seized. JavaScript is disabled. One of two conditions is possible. Thank 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. I only found it while trying to force it to overheat. The pwm feed is positive so if that breaks it defaults to unlocked. You do realize that you are posting things that don't work for the everyday person trying to figure out his problem. Alternatively, an optical tachometer can be used to measure fan speed. Solenoid coil / Actuator check - Try rotating solenoid coil / actuator and see if it's stuck, 5. Next, locate the fan clutch bolted to the water pump in the engine compartment. Not everyone has a scanner that can command the fan clutch. We recommend that you check the transducer and fan clutch assembly. If it feels the same, then I would assume the clutch is done. A failing fan clutch could leave you stranded with expensive repair bills, so pay attention to these symptoms. No CEL. rS&cD5Ts6'E7FdU()8GHVe*9:IJWXYZftugvwhijxyz i !1AQa"q2#BR 3br$Csc%4S5&DTdEU' Secondly, if your viscous fan hub is electronically controlled, check if the wire is unplugged or damaged. Some fan clutches are designed with a built-in thermometer somewhere on the instrument panel. 0000060428 00000 n We use cookies to make wikiHow great. 2 Simply follow the steps below and you rill receive a replacement part number. AC little warm. 0000000016 00000 n May daughters use it now. You should be able to hear it from where you're sitting inside the cabin of the vehicle. Electronic-Viscous Fan Clutch Troubleshooting During engine start up, the EV fan clutch will engage and match engine speed for up to 3 minutes. They contain a drive and driven plate with annular grooves that fill with a thick viscous silicon fluid. Resurrecting this old thread. Horton VMaster Ultra (Stratis) Viscous Fan Drive Troubleshooting Guide Engine feature code 12THX GENERAL OPERATION (ALL ENGINES) Horton VMaster is a variable speed drive. g? Hope you don't mind me referencing your video? Motorhomes and RVs | Engine cooling systems How to Tell If Your Fan Clutch Is Going Bad - LiveAbout One last thing, check the wiring, especially at the clutch connector to ensure there are no broken wires. Has the waterpump bearing seized around the fan shaft? Tuning and Understanding your Toyota Viscous Fan Clutch 77 0 obj <>stream By . It should turn smoothly with some drag. 0 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? You must log in or register to reply here. I am going to do a re test of mine, I think it is bad and I want to be sure. 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. Inspecting the Fan Clutch Manually Download Article 1 Pop the hood. These fans are needed at slow speeds, typically below 35 mph and at idle. 0 0000052838 00000 n The valve is activated by a pulse width modulation (PWM) output signal from the powertrain control module (PCM). 1 Viscous fan drives | Variable speed fan clutch The fan clutch won't dis engage. I found this video by Scanner Danner where he's trying to diagnose a fan code. PDF Visctronic 12 Volt 732/842/882 Fan Drives - BorgWarner I just repaired a electro viscous clutch today on my 02 TrailBlazer. . Fan Clutch Symptoms of a Locked-in Fan Clutch | Viscofans Vehicle overheating One of the first symptoms that is commonly associated with a bad or failing fan clutch is an overheating engine. 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 I just want to add another thing to check before declaring the clutch dead. Fan Clutch A/C Problems. | Cummins Diesel Forum Clutch slipping and eventual failure are normal with time. ` xref 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. 42 36 If your fan clutch has gone bad, replace it as soon as possible to prevent engine damage. 0000060846 00000 n Make sure your new fan clutch is the same type as the original. DT Also when I first press the gas pedal it seems like the engine wants to stall which is probably something totally different? Viscous drives tend to have the first two issues. Any input would be appreciated. 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. Fan Clutch Replacement - Popular Mechanics Found loose internal connections at the harness connector on the clutch and tightened them up a bit. Customer Question. Engine still runs great! My fan seems to run fast all the time but not loud like the jet engine i've read about. 0000001342 00000 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. Common Fan Clutch Noises And What They Mean | GMB Blog Benjamin Jerew is an ASE-certified Master Automobile Technician with over a decade of experience in auto repair, maintenance, and diagnosis. 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. If you still need assistance, contact our customer service team at (800) 810-9110. It was a junkyard unit off an 03 Envoy. During engine start up, the EV fan clutch will engage and match engine speed for up to 3 minutes. Throw away the ruined newspaper Rev the engine, you should notice that the fan increases speed, but not proportionally to the crank speed. 450 The sensor returns a signal pulse through the cooling fan speed signal circuit. A viscous fan clutch enables the fan to more or less freewheel . 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. 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. A noisy, constant droning noise from 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. Clutch fan check - See if any visible damage on clutch fan, 3. There is an air leak in the fan drive. When a pneumatic fan clutch fails, it's likely one of three symptoms is present: The clutch won't engage. So, youve noticed some, or all, of the symptoms above and think a possible culprit could be a locked-in fan clutch. 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. Develop the tech skills you need for work and life. 1. 0000002273 00000 n Here's a list of the most common fan clutch noises and what each one could mean: 1. Viscous fan clutches are belt-driven and found on many older rear-wheel-drive passenger cars. When it happens its especially hard to take when you need your vehicle or application to finish a job. 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. If you need advice on replacing a faulty fan clutch, please get in touch. o! 57 0 obj <>stream OK. I replaced it earlier this year while chasing an overheating condition (along with the Water Pump and Thermostat). Electric cooling fan clutch. | The Truck Stop 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. As engine temperature increases, look for a sudden jump in fan speed. From the exterior, a locked-in fan clutch will be hard to diagnose with just a visual check. 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. 0000070596 00000 n 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. 0000066928 00000 n Tech Tip: Electric viscous fan clutches in 2003-09 5.9L Dodge Ram 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 . )Qo8Ni{Im'Ur$z3-XfLdE1c=e/ n4 a#I63px&LW42C`?c+fO~ lM |}&&`z`x7tv}3l6yUoo7~0EoeYf eh80/ar;)B]T# Clutch fan check - See if any visible damage on clutch fan 3. No CEL. Viscous fan drive technology Precise thermal management that does so much more than keep engines cool. Then let it get hot. The oil flows to and from the main chamber as engine heat fluctuates, engaging and disengaging the clutch. 0000069649 00000 n 0000049576 00000 n The fan clutch experts at Kit Masters can help you identify your fan so that you can determine the correct replacement. Unit 6 Scandinavia CourtChain Bar RoadCleckheatonBD19 3QW UK. By clicking I Accept on this banner you consent to the use of cookies unless you disable them. 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. Yes, the one in this video is bad. For your own safety, you should never attempt to manually test your fan clutch while the vehicle is running. 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. This means that the fan should power down at higher speeds because the rushing air is sufficient for cooling the engine. Short of a relay sticking, I see no possible cause that it would be electrical. For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. 0000069624 00000 n Hmmmmm.. that truck looks awfully familiar. 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! Ideally, the fan shouldnt spin more than 1-1 times. For a better experience, please enable JavaScript in your browser before proceeding. Possible Cause: Try rotating the bottom part (solenoid coil / actuator) with hand. A bad fan clutch can cause engine problems like excessively high temperatures and poor performance. Firstly, check to make sure something hasnt gotten caught or wrapped up around the back of the viscous 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. Luckily, there are a few symptoms you can look for to diagnose whether the fault is a seized fan clutch or not.
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