DT Tuning and Understanding your Toyota Viscous Fan Clutch A Thank you! 0000001016 00000 n If your unit has one, keep an eye on the temperature so youll know about when the fan speed should begin ramping up. It would definitely do damage. Sometimes a customer will complain about a roaring noise coming from the engine bay. DIY: Viscous Fan Clutch - Silicone Oil Refill - YouTube If not, it's defective. This article has been viewed 118,630 times. 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. X 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 one in this video is bad? 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. Common Fan Clutch Noises And What They Mean | GMB Blog 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 When I said DO NOT TEST, that's with the method described with the rag. Honestly, that sounds like normal behavior to me. By landing on this page, were guessing you know exactly what one does: This is what a fan clutch does, if youre unsure. 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 the noise from the engine is too loud, try popping the hood to prevent the sound from being muffled. By clicking I Accept on this banner you consent to the use of cookies unless you disable them. Found loose internal connections at the harness connector on the clutch and tightened them up a bit. Check the assembly for leaks through the seams and around the shaft. The fan clutch experts at Kit Masters can help you identify your fan so that you can determine the correct replacement. Standard thermostatic fan clutches will only be present on cars and trucks with rear-wheel drive. Like all viscous fan clutches it may be turning, but is it working correctly? 0000070596 00000 n Your vehicles fan clutch is an often overlooked but important little partits responsible for gauging the temperature of the air passing through the radiator and keeping the engine from overheating. Check to make sure each of the bolts holding the fan clutch in place is secure and intact. They also have a thermostatic spring. 0000037348 00000 n This animation of Horton's latest variable-speed fan drive, the LCX, shows viscous cooling technology in action. You should probably slow your role a little and do more reading. 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. image/tiff Normal solenoid coil electric current should be 40mA to 60mA. Engine still runs great! I just want to add another thing to check before declaring the clutch dead. Could not find any bad wires, just looseness in the actual pins inside the connector. This condition will cease shortly upon disengagement. . 1 hz on the cooling fan speed signal circuit equals about 1 rpm of actual fan speed. HWyTSW; * 1d!y ZmK*8gA:s9hG{F;3U9Q]DMNDIBM. Most clutches will fade with time as spring-type clutches lose thermal sensitivity and fluid-filled clutches lose fluid viscosity. The info I posted regarding a locked clutch (beyond a few minutes) is still accurate. Fan Clutch Symptoms of a Locked-in Fan Clutch. It will also set a code if the fan clutch is not running at the set RPM - too slow or too fast. "By perseverance, study, and eternal desire, any man can become great." You are using an out of date browser. 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 . GMTNation.com uses SSL to secure all traffic between our server and your browsing device. Make sure your new fan clutch is the same type as the original. Initially I get a Trans Flush at Hello, everyone. Its possible to upgrade from a non-thermal clutch to a more efficient thermal model, but not the other way around. Original fan and water pump. Some fan clutches are designed with a built-in thermometer somewhere on the instrument panel. As engine temperature increases, look for a sudden jump in fan speed. Most truck fan clutches will fail-safe in this instance (i.e. 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 Company No. 450 . We had a few overheating issues at Bremer Bay Why is it overlooked? You must log in or register to reply here. The "drive disc" and the "front half" share these closely spaced rings. The PCM supplies a 5-volt reference and a low reference to the Hall effect sensor. If the air flow feels suspiciously hot or weak, it could just be a bad vent. 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. I dont want to go near the fan and try and stop it. 0 The sensor returns a signal pulse through the cooling fan speed signal circuit. Keep an eye out for any visible components that are bent, crooked, or missing. No CEL. Too fast to try and slow it with a rag. adobe:docid:photoshop:f99bcbb8-4863-11d9-b0f7-b8eb50f766bb 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. Some viscous properties of the fan hub may vary the res Possible Cause: Damaged engine fan usually caused by friction, wear or entry of foreign objects. `han_aHS{%2hp\MJXB (o_ya;b'aT^)s,_8<9|J]ba[||T-=%9k8^q+dzn.fmUO~7t~4=FiSuY>Q0? Install the Horton EC450 TM Fan Clutch on the engine. Adobe d A viscous fan clutch enables the fan to more or less freewheel . 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. Engine overheating at low speed or when stopped is the most-common fan clutch failure symptom. From the exterior, a locked-in fan clutch will be hard to diagnose with just a visual check. If the ground breaks it's the same. 0000052661 00000 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. You are also talking to people that have been doing this for a while on this platform. Now what? It will regulate engine temperatures more efficiently compared to older direct fuel injection engine models. These fans are needed at slow speeds, typically below 35 mph and at idle. (The previous clutch had loose bearings.) trailer Even when the drive is off the fan will spin between 50-300 rpm. ~HO8$/` qAXwx$XA, uHfX m@;d;Hh22Ig 7Ya If your fan clutch has gone bad, replace it as soon as possible to prevent engine damage. I'm open to ideas. 0000060428 00000 n As a result, you may think that your fan clutch has seized. Thank you. Then test the fan clutch by giving it a good push. When I say it disengages, I mean it coasts to a stop! and A Transmission Fluid & Cooler Lines Flush, too? . You can also perform this test while the vehicle is parked and in neutral gear. A bit obvious, but make sure to check the engine management system on your vehicle before anything else. How to test a fan clutch - YouTube Solenoid coil / Actuator check - Try rotating solenoid coil / actuator and see if it's stuck 5. Benjamin Jerew is an ASE-certified Master Automobile Technician with over a decade of experience in auto repair, maintenance, and diagnosis. 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. It may not display this or other websites correctly. 0000021244 00000 n OK. )Qo8Ni{Im'Ur$z3-XfLdE1c=e/ n4 a#I63px&LW42C`?c+fO~ lM |}&&`z`x7tv}3l6yUoo7~0EoeYf eh80/ar;)B]T# Yes, the one in this video is bad. They contain a drive and driven plate with annular grooves that fill with a thick viscous silicon fluid. Thanks for the quick response. 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. These fans are needed at slow speeds, typically below 35 mph and at idle. 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. The "drive disc" spins freely in the housing except for the silicon fluid. If you have difficulty rotating or it's just stuck, then it could be either foreign object or clutch fan. o! Short of a relay sticking, I see no possible cause that it would be electrical. The fan clutch is responsible for controlling the operation of the cooling fans. It relies on temp sensor to detect temperature and send signals through ECM/ECU and switches the clutch fan to different levels accordingly. Time for a Radiator-Heater Core Flush? One last thing, check the wiring, especially at the clutch connector to ensure there are no broken wires. Global Parts Distributors has the electronic fan clutch assembly: part number 2911297. Vehicle overheating One of the first symptoms that is commonly associated with a bad or failing fan clutch is an overheating engine. Here's a list of the most common fan clutch noises and what each one could mean: 1. GB 447 5091 38. Viscous Fan Clutch Not Working and Troubleshoot Guide When a leak occurs, it's at the bearing seal, at the center rear of. These fans are more efficient than flex fans that are controlled by engine speed instead of temperature. 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. AC little warm. Keep holding it while the engine gets hotter, As it gets hotter, you should start feeling some tugging from the fan trying to get it going. We recommend that you check the transducer and fan clutch assembly. % of people told us that this article helped them. It disengaged once at 206 degrees, another time at 217 degrees but sometimes it stays engaged. Like any other part, fan clutches can develop issues that, if left unchecked, can be both devastating and costly. %PDF-1.5 % Truck Repair; Viscus fan on MP8 MACK engine on all the time, happened. The PCM never puts it to 100%, 90% is the highest and that's at very high engine temps. 2 0000035192 00000 n Give the water pump hose a quick jostle as well to see if the problem might lie there. Viscous fan drives | Variable speed fan clutch Clutch fan check - See if any visible damage on clutch fan 3. 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. Motorhomes and RVs | Engine cooling systems If the fan clutch is going bad or has failed, there are a couple of ways you may notice.
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