We use cookies and similar web technologies to recognize your repeat website visits and preferences and to analyze traffic. Quick tutorial on how to refill your viscous fan clutch with proper fluid and reseal the chamber. 1. Its possible to upgrade from a non-thermal clutch to a more efficient thermal model, but not the other way around. endstream endobj 15 0 obj <>>> endobj 16 0 obj <>/Font<>/ProcSet[/PDF/Text]/Properties<>>>/Rotate 0/TrimBox[0.0 0.0 612.0 792.0]/Type/Page>> endobj 17 0 obj <>stream Give the water pump hose a quick jostle as well to see if the problem might lie there. Fan Clutch Symptoms of a Locked-in Fan Clutch. 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. o! It should turn smoothly with some drag. 42 36 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. As you could imagine, trying to stop a locked fan with a rag would not be a pleasant experience. 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. Vehicle overheating One of the first symptoms that is commonly associated with a bad or failing fan clutch is an overheating engine. Adobe Photoshop CS Windows Solenoid coil / Actuator check - Try rotating solenoid coil / actuator and see if it's stuck, 5. Front-wheel drive vehicles are equipped with a completely different cooling system due to the way the engine is configured. Viscous fan clutches are belt-driven and found on many older rear-wheel-drive passenger cars. In most cases, fan blades are designed to flex up to. Install the Horton EC450 TM Fan Clutch on the engine. 1 The one in this video is bad? GMTNation.com uses SSL to secure all traffic between our server and your browsing device. Our community has been around for many years and pride ourselves on offering unbiased, critical discussion among people of all different backgrounds. An overheating engine could literally weld itself into scrap metal. )Qo8Ni{Im'Ur$z3-XfLdE1c=e/ n4 a#I63px&LW42C`?c+fO~ lM |}&&`z`x7tv}3l6yUoo7~0EoeYf eh80/ar;)B]T# Clutch slipping and eventual failure are normal with time. adobe:docid:photoshop:f99bcbb8-4863-11d9-b0f7-b8eb50f766bb A new radiator fan and thermal fan clutch, ready to keep your engine cool. When I say it disengages, I mean it coasts to a stop! Thank you! will continue at full speed if the electrical circuit is faulty). 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. A cooling fan clutch is expected to fail over time. The fan clutch should be disengaged with no voltage applied. Wire check - See if the wire to ECU is normal, 4. 0000069993 00000 n If your fan clutch has gone bad, replace it as soon as possible to prevent engine damage. I am going to do a re test of mine, I think it is bad and I want to be sure. Viscous fan clutch is going to be the norm when more industrial engine uses ECM/ECU. I just checked, and yes the speed increase and decrease with rpm. 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. startxref If the clutch is constantly engaged, the vehicle will suffer from poor gas mileage and loss of horsepower. EC450TM Fan Clutch NOTE Do not loosen the P-clamp attaching the wiring harness to the metal tab on the Fan Clutch. For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. Also when I first press the gas pedal it seems like the engine wants to stall which is probably something totally different? 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. Coolant temperature sensor circuit problems can set a DTC. Electronic-Viscous Fan Clutch Troubleshooting During engine start up, the EV fan clutch will engage and match engine speed for up to 3 minutes. One last thing, check the wiring, especially at the clutch connector to ensure there are no broken wires. 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. DIY: Viscous Fan Clutch - Silicone Oil Refill Pine Hollow Auto Diagnostics 450K views 7 years ago 1995-2004 Toyota Tacoma fan clutch rebuild. Engine belt stuck on clutch fan, causing solenoid coil/actuator unable to rotate, 1. 0000000016 00000 n 0000060846 00000 n Could not find any bad wires, just looseness in the actual pins inside the connector. The fan clutch experts at Kit Masters can help you identify your fan so that you can determine the correct replacement. Luckily, there are a few symptoms you can look for to diagnose whether the fault is a seized fan clutch or not. When the fan clutch engages, it spins up greatly, increasing air flow through the radiator and over the engine. 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. Ideally, the fan shouldnt spin more than 1-1 times. Short of a relay sticking, I see no possible cause that it would be electrical. 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 [JieZ`$@v*v}F)RNf-=}#>c,kc^pv5!1iiFLTL" #XjtvFHb4uubu0.-lD_r,`e)W/H]S$G+h'uqq6`G#ogkGFr'E{G=J'{GGPvR(n Viscofans is in no way affiliated to any of the brands shown on this site. When the engine starts to get too hot, the fan clutch takes the air flowing through the radiator, cools it down, and feeds it into the engine to cool it. Shows the signals to and from the the fan and how the fan operates when commanded by the PCM and the scanner. If it feels rough or does not turn then replace the drive. 0000001551 00000 n Some fan clutches are designed with a built-in thermometer somewhere on the instrument panel. I replaced it earlier this year while chasing an overheating condition (along with the Water Pump and Thermostat). Thanks to all authors for creating a page that has been read 118,630 times. 0000069624 00000 n 2004-12-07T12:21:43-05:00 The engine temp reads a little low all the time, about 2-3 notches below 210. Warning: This post may contain misspelling, grammatical errors, disorganized sentence structure. Some viscous properties of the fan hub may vary the res Ed Beery is an Automotive Specialist and the Owner of InTechgrity Automotive Excellence based in Denver, Colorado. hb```"wVF/3 1K6l|Z+W9"qHg6Engl!z,A& qx3h9@ -Vb5$?%?@,#Xj~aXSFe40hXmW{|o\ s2WIp?k2pUiF 0 gA 2004-12-07T10:24:41-05:00 Develop the tech skills you need for work and life. Viscous fan clutches are belt-driven and found on many older rear-wheel-drive passenger cars. 0000060915 00000 n Honestly, that sounds like normal behavior to me. Then test the fan clutch by giving it a good push. When I said DO NOT TEST, that's with the method described with the rag. 3000000/10000 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. I just repaired a electro viscous clutch today on my 02 TrailBlazer. Traces of oil are perfectly normal, and wont necessarily be an indication that your clutch is shot. 77 0 obj <>stream One (of many) of my top things to do is service the Transmission. Search by part number to find a replacement for your fan clutch. It disengaged once at 206 degrees, another time at 217 degrees but sometimes it stays engaged. Perhaps the Heat Soak cannot get carried away because things may have gotten a bit "sluggish" inside of the radiating units? References. It was a junkyard unit off an 03 Envoy. If fan speed is not detected a DTC will be set. Identify Your Viscous Fan Clutch. 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. 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. So, youve noticed some, or all, of the symptoms above and think a possible culprit could be a locked-in fan clutch. The fan needs to operate within the limits at each test point.The fan should engage and remain engaged during the entire engagement request. 0000002273 00000 n Suggestion: See if there's any foreign object stuck on clutch fan, if any foreign objects absent, then it is likely the clutch fan. The PCM never puts it to 100%, 90% is the highest and that's at very high engine temps. All rights reserved. endstream endobj startxref this will apply to T1N sprinters as well as NCV3 equipped with a. Check Mechanical Integrity of Clutch With engine off, rotate fan by hand. When it happens its especially hard to take when you need your vehicle or application to finish a job. 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 Solenoid coil / Actuator testor - Test solenoid coil / Actuator if you have an actuator tester. I feel like I reset something because I've never seen it go slow then engage. The 2 halves opened. 0000070596 00000 n A Yes, the one in this video is bad. Im pretty sure that is why this method is posted. ()*6789:FGHIJVWXYZefghijtuvwxyz ? 0000001421 00000 n 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. The valve in the EV, electro-viscous fan clutch, is intended to be controlled by PWM with an RPM sensor to provide feedback and compensate for age related slowdown. ELK\KHA(gYIm|eTjQ Gb$cqla7?Nf$77X!ry~1h1,amo 2jI&zI? Z;:QJ-uvgMq4Z(*n *ER"Mvz. You can also perform this test while the vehicle is parked and in neutral gear. Thanks for the quick response. I have a 2003 EXT 4WD Trailblazer 235,000 miles. Hold your hand a few inches away from the vent so slight variations in temperature will be more noticeable. Ed and the InTechgrity Automotive Excellence Team are approved by the American Automobile Association (AAA) for repairs and are Automotive Service Excellence (ASE) certified. Viscous fan drive technology Precise thermal management that does so much more than keep engines cool. Too fast to try and slow it with a rag. This article was co-authored by Ed Beery. These fans are needed at slow speeds, typically below 35 mph and at idle. These fans are more efficient than flex fans that are controlled by engine speed instead of temperature. that did the trick. 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. 0000066928 00000 n wikiHow is where trusted research and expert knowledge come together. 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. This means that the fan should power down at higher speeds because the rushing air is sufficient for cooling the engine. Most truck fan clutches will fail-safe in this instance (i.e. Success stories from users of variable-speed cooling solutions. This is considered normal and may last more than 3 minutes in cooler climates or at lower driving speeds resulting in fan roar. HWyTSW; * 1d!y ZmK*8gA:s9hG{F;3U9Q]DMNDIBM. Benjamin Jerew is an ASE-certified Master Automobile Technician with over a decade of experience in auto repair, maintenance, and diagnosis. %PDF-1.4 % 0000052838 00000 n NOTE: This fix will NOT help if your fan clutch is mechanically worn, or if the thermal va. Possible Cause: Damaged engine fan usually caused by friction, wear or entry of foreign objects.