We recommend that you check the transducer and fan clutch assembly. A locked-in, or seized, fan clutch can cause radiator fans to fully engage at all speeds. You must log in or register to reply here. 0000060428 00000 n 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. You should be able to hear it from where you're sitting inside the cabin of the vehicle. With more than eight years of experience, he specializes in providing maintenance and repair services for both individuals and companies. 0000037348 00000 n Fan Clutch Symptoms of a Locked-in Fan Clutch | Viscofans A Has the waterpump bearing seized around the fan shaft? It will also set a code if the fan clutch is not running at the set RPM - too slow or too fast. 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. Identify Your Viscous Fan Clutch - Kit Masters 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. Inspecting the Fan Clutch Manually Download Article 1 Pop the hood. 42 36 Subject: Troubleshooting Vehicles Equipped with Viscous Fan Drives Qualify by assuming the vehicle to be in OEM condition. HWyTSW; * 1d!y ZmK*8gA:s9hG{F;3U9Q]DMNDIBM. 0000021244 00000 n If the fan still hasnt kicked in by the time temperature reaches about 200F (93C), you can be sure that theres a problem somewhere. 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. 4294967295 If the fan clutch requires repair, take the vehicle to a qualified mechanic. Appreciate the help. 0000014403 00000 n and A Transmission Fluid & Cooler Lines Flush, too? 0000025483 00000 n Most truck fan clutches will fail-safe in this instance (i.e. 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. It does not function like an on/off drive. Give the water pump hose a quick jostle as well to see if the problem might lie there. Initially I get a Trans Flush at Hello, everyone. There are 7 references cited in this article, which can be found at the bottom of the page. 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. Engine fan check - See if any damages on fan, 2. . 0000057354 00000 n A noisy, constant droning noise from the fan. Check Mechanical Integrity of Clutch With engine off, rotate fan by hand. Some fan clutches are designed with a built-in thermometer somewhere on the instrument panel. If you are getting that tugging, the clutch is working. Try it again but pull the fan relay. 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. Check to make sure each of the bolts holding the fan clutch in place is secure and intact. It disengaged once at 206 degrees, another time at 217 degrees but sometimes it stays engaged. 0000002179 00000 n 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. uuid:2ce534b2-d8a3-11d8-a54e-a63691f3af4c By opening and closing the fluid port valve, the PCM controls the fan speed. Front-wheel drive vehicles are equipped with a completely different cooling system due to the way the engine is configured. Perhaps the Heat Soak cannot get carried away because things may have gotten a bit "sluggish" inside of the radiating units? It disengaged once at 206 degrees, another time at 217 degrees but sometimes it stays engaged. 1988467. Viscous drives tend to have the first two issues. 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. If it spins more than three full rotations, this indicates that it may be prone to slipping. Vehicle overheating One of the first symptoms that is commonly associated with a bad or failing fan clutch is an overheating engine. All it does is freewheel and has no resistance. When I said DO NOT TEST, that's with the method described with the rag. Quick tutorial on how to refill your viscous fan clutch with proper fluid and reseal the chamber. It is possible something like a plastic bag could have got wound up where the shaft goes in to the bearing. For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. Found loose internal connections at the harness connector on the clutch and tightened them up a bit. 0000035192 00000 n If it doesn't change, it's toast. 0000070596 00000 n 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. As you could imagine, trying to stop a locked fan with a rag would not be a pleasant experience. As the engine speed increases, the blades of a flex fan change their angle. I just repaired a electro viscous clutch today on my 02 TrailBlazer. hb```"wVF/3 1K6l|Z+W9"qHg6Engl!z,A& qx3h9@ -Vb5$?%?@,#Xj~aXSFe40hXmW{|o\ s2WIp?k2pUiF 0 gA tt4*ittd830z02OL0 p A new radiator fan and thermal fan clutch, ready to keep your engine cool. 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. If you have difficulty rotating or it's just stuck, then it could be either foreign object or clutch fan. Once viscous fluid is in the working chamber, shearing of the fluid results in fan rotation. Fan Clutch Failure Modes and Troubleshooting | GMB Blog PDF Ec450tm Electromagnetic Fan Clutch (Standard and Compact Styles 2 As engine temperature increases, look for a sudden jump in fan speed. Technical Services (UK) Ltd trading as Viscofans. Possible Cause: Try rotating the bottom part (solenoid coil / actuator) with hand. 6.7 cooling fan problem | Ford Powerstroke Diesel Forum Success stories from users of variable-speed cooling solutions. One smart strategy is to have your vehicles fan clutch and water pump replaced together. It will cost somewhere between $150-300 to have a new fan clutch installed, on average. I feel like I reset something because I've never seen it go slow then engage. I replaced it earlier this year while chasing an overheating condition (along with the Water Pump and Thermostat). 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. Also verify no indication of viscous fluid leakage. 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! Check the assembly for leaks through the seams and around the shaft. Viscous Fan Clutch. I dont want to go near the fan and try and stop it. I'm open to ideas. Suggestion: Clutch fan isn't the source of the issue. This should lock the clutch and pull air like a dump truck. Traces of oil are perfectly normal, and wont necessarily be an indication that your clutch is shot. Tuning and Understanding your Toyota Viscous Fan Clutch 0000035283 00000 n 3000000/10000 0000001895 00000 n Solenoid coil / Actuator testor - Test solenoid coil / Actuator if you have an actuator tester. 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. The fan clutch is integral to the safe and efficient operation of your commercial vehicle or application engine. VAT No. 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. 1 hz on the cooling fan speed signal circuit equals about 1 rpm of actual fan speed. It may work at 100% but maybe not at 20-30%. 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. Benjamin Jerew is an ASE-certified Master Automobile Technician with over a decade of experience in auto repair, maintenance, and diagnosis. In most cases, fan blades are designed to flex up to. Company No. 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. Possible Cause: Damaged engine fan usually caused by friction, wear or entry of foreign objects. g? Suggestion: Normally it has nothing to do with clutch fan. I've been trying to read as many of these waterpump/fan post as possible. It will regulate engine temperatures more efficiently compared to older direct fuel injection engine models. If not, it's defective. This condition will cease shortly upon disengagement. For a better experience, please enable JavaScript in your browser before proceeding. The fan fault is logged in your engine management system. 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. Fan clutch ticking | Ford Explorer - Ford Ranger Forums - Serious I just joined today and been digging into whether I should replace EV on 2004 Buick Rainier 5.3. 0000069649 00000 n The "drive disc" and the "front half" share these closely spaced rings. DIY: Viscous Fan Clutch - Silicone Oil Refill Pine Hollow Auto Diagnostics 450K views 7 years ago 1995-2004 Toyota Tacoma fan clutch rebuild. The actual fan speed should be approx - 250 RPM of desired.. Even if I pull the relay or unplug the fan it still runs fast. Contact Whatsapp: +6012 879 3220 if you need any product! No CEL. 0000000016 00000 n Fan clutch engaged on cold startup on 4.6 V8? | Ford Explorer - Ford Has the waterpump bearing seized around the fan shaft? All proceeds go to supporting the site. You can also perform this test while the vehicle is parked and in neutral gear. For your own safety, you should never attempt to manually test your fan clutch while the vehicle is running. trailer AC little warm. I only found it while trying to force it to overheat. The valve is activated by a pulse width modulation (PWM) output signal from the powertrain control module (PCM). 77 0 obj <>stream The engine temp reads a little low all the time, about 2-3 notches below 210. 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. startxref Seek the source of issue elsewhere, Possible Cause: The outer part or solenoid coil has signs of fluid leaking. Also when I first press the gas pedal it seems like the engine wants to stall which is probably something totally different? My fan seems to run fast all the time but not loud like the jet engine i've read about. gave the two in question a little twist with a fine nosed pliers. Hold your hand a few inches away from the vent so slight variations in temperature will be more noticeable. This means that the fan should power down at higher speeds because the rushing air is sufficient for cooling the engine. Anyone seen a case where the EV Fan Clutch DISENGAGES completely? One of two conditions is possible. 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. No CEL. A properly-functioning fan clutch is critical to engine reliability, as it works to maintain a safe temperature range. Solenoid coil / Actuator check - Try rotating solenoid coil / actuator and see if it's stuck, 5. Fan Clutches for Commercial Vehicles - SACHS - ZF Friedrichshafen NOTE: This fix will NOT help if your fan clutch is mechanically worn, or if the thermal va. Check All Cooling System Components Radiator, water pump, thermostat, temperature gauge, fault codes, etc. Viscous Fan Clutch Not Working and Troubleshoot Guide I went out and started up the truck and the fan was spinning FAST. xref Now somethimes it only gets to halfway to 210, even in the summer. Then test the fan clutch by giving it a good push. Right when it stop it tried to "tick" forward as I was holding it. How to test a fan clutch - YouTube 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. GB 447 5091 38. Customer Question. )Qo8Ni{Im'Ur$z3-XfLdE1c=e/ n4 a#I63px&LW42C`?c+fO~ lM |}&&`z`x7tv}3l6yUoo7~0EoeYf eh80/ar;)B]T# 1. One (of many) of my top things to do is service the Transmission. Standard thermostatic fan clutches will only be present on cars and trucks with rear-wheel drive. see page 3 of the GM Techlink Document I have attached. Suggestion: See if there's any foreign object stuck on clutch fan, if any foreign objects absent, then it is likely the clutch fan. Luckily, there are a few symptoms you can look for to diagnose whether the fault is a seized fan clutch or not. Okay, so in your other post to me about testing it you say that the one in this video is bad. 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. This is considered normal and may last more than 3 minutes in cooler climates or at lower driving speeds resulting in fan roar. Ed and the InTechgrity Automotive Excellence Team are approved by the American Automobile Association (AAA) for repairs and are Automotive Service Excellence (ASE) certified. We don't all go to a dealer to get work done right away. 2004-12-07T12:21:43-05:00 hb```c``Jg`e`fgc@ >(GCPa J0 Hope you don't mind me referencing your video? Shows the signals to and from the the fan and how the fan operates when commanded by the PCM and the scanner. Clutch fan check - See if any visible damage on clutch fan, 3. 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. When this happens, many of the symptoms described above can be experienced. References. This fluid's flow is regulated by a bi-metallic spring that opens and closes a control valve. Could not find any bad wires, just looseness in the actual pins inside the connector. 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. The sensor returns a signal pulse through the cooling fan speed signal circuit. `han_aHS{%2hp\MJXB (o_ya;b'aT^)s,_8<9|J]ba[||T-=%9k8^q+dzn.fmUO~7t~4=FiSuY>Q0? Before you go looking for your fan clutch, make sure your vehicle is in park, with the engine off and the handbrake firmly engaged. 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. Its possible to upgrade from a non-thermal clutch to a more efficient thermal model, but not the other way around.
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