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\n<\/p><\/div>"}, How to Fit a Clutch Plate: Everything Home Mechanics Need to Know, How to Choose The Right Torque Converter: Stall Speed, Brand and Size Guide. GB 447 5091 38. GMTNation.com uses SSL to secure all traffic between our server and your browsing device. tt4*ittd830z02OL0 p %PDF-1.5 % Firstly, check to make sure something hasnt gotten caught or wrapped up around the back of the viscous fan clutch. How to Test a Fan Clutch | Hot Rod Forum 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. 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. 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. Solenoid coil / Actuator check - Try rotating solenoid coil / actuator and see if it's stuck, 5. Warning: This post may contain misspelling, grammatical errors, disorganized sentence structure. Squeaks while doing it too. 0000002179 00000 n %%EOF I'm open to ideas. Fan Clutch Replacement - Popular Mechanics 0000060995 00000 n Tuning and Understanding your Toyota Viscous Fan Clutch I just repaired a electro viscous clutch today on my 02 TrailBlazer. Alternatively, an optical tachometer can be used to measure fan speed. You are also talking to people that have been doing this for a while on this platform. see page 3 of the GM Techlink Document I have attached. They also have a thermostatic spring. These fans are needed at slow speeds, typically below 35 mph and at idle. I dont want to go near the fan and try and stop it. It disengaged once at 206 degrees, another time at 217 degrees but sometimes it stays engaged. Equally frustrating is diagnosing the fault. Electronic-Viscous Fan Clutch Troubleshooting During engine start up, the EV fan clutch will engage and match engine speed for up to 3 minutes. Perhaps the Heat Soak cannot get carried away because things may have gotten a bit "sluggish" inside of the radiating units? As the engine speed increases, the blades of a flex fan change their angle. You can also perform this test while the vehicle is parked and in neutral gear. 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. I keep using it as an example on how to test the fan so thought it would be prefect for this article. Original fan and water pump. startxref 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. If fan speed is not detected a DTC will be set. 0000060915 00000 n This condition will cease shortly upon disengagement. It relies on temp sensor to detect temperature and send signals through ECM/ECU and switches the clutch fan to different levels accordingly. When a leak occurs, it's at the bearing seal, at the center rear of. 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. 42 0 obj <> endobj The oil flows to and from the main chamber as engine heat fluctuates, engaging and disengaging the clutch. LEARN MORE >>. 0000014403 00000 n The fan clutch won't dis engage. 0000069993 00000 n If you are getting that tugging, the clutch is working. These elements are natural in the process of Writing in a foreign language. The PCM supplies a 5-volt reference and a low reference to the Hall effect sensor. Like any other part, fan clutches can develop issues that, if left unchecked, can be both devastating and costly. 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. The wires run in a rubber hose in front of the fan. Stopped with rag pushed in for a few minutes but couldnt see any temp rise, with air on, but its 55F here. I think its doing what u r saying, just hard to tell how hard it should be trying to pull out of hand. Viscus fan on MP8 MACK engine on all the time, happened - JustAnswer Front-wheel drive vehicles are equipped with a completely different cooling system due to the way the engine is configured. 0000049576 00000 n The fan needs to operate within the limits at each test point.The fan should engage and remain engaged during the entire engagement request. Once viscous fluid is in the working chamber, shearing of the fluid results in fan rotation. I agree, a T444E will get hot easily unless cooled well, so the fan clutch is critical. 0000001421 00000 n Set the Quick tutorial on how to refill your viscous fan clutch with proper fluid and reseal the chamber. and A Transmission Fluid & Cooler Lines Flush, too? 14 0 obj <> endobj It will regulate engine temperatures more efficiently compared to older direct fuel injection engine models. Here, you can see where the fan and fan clutch are driven by the engine. 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? 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 wikiHow is where trusted research and expert knowledge come together. I just want to add another thing to check before declaring the clutch dead. Fan Clutch Failure Modes and Troubleshooting | GMB Blog 0000066631 00000 n Fan Clutch Symptoms of a Locked-in Fan Clutch | Viscofans Simply follow the steps below and you rill receive a replacement part number. 1. Wire check - See if the wire to ECU is normal 4. PDF IK0900075 - Horton Stratis Fan Hub Diagnostics Page 1 of 6 6% It may work at 100% but maybe not at 20-30%. A viscous fan clutch enables the fan to more or less freewheel . Too fast to try and slow it with a rag. 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. Possible Cause: Damaged engine fan usually caused by friction, wear or entry of foreign objects. &\cUj This is considered normal and may last more than 3 minutes in cooler climates or at lower driving speeds resulting in fan roar. Give the water pump hose a quick jostle as well to see if the problem might lie there. The one in this video is bad? Squeaks while doing it too. ~HO8$/` qAXwx$XA, uHfX m@;d;Hh22Ig 7Ya 1988467. 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. The fan clutch unit is approximately 1 foot tall by 1 foot wide. 0000060378 00000 n 0 This article has been viewed 118,630 times. Inside the fan clutch, there is a small reservoir filled with a viscous silicone-based oil. Posted - 02/07/2008 : 5:47:26 PM. These issues will draw the PCM's attention, and it will turn on the check engine light to warn you about them. When I say it disengages, I mean it coasts to a stop! By signing up you are agreeing to receive emails according to our privacy policy. the cooling fan using a Hall effect sensor, which reads a reluctor track inside the fan clutch. They can cause a vehicle to overheat at idle and in heavy traffic. 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. Keep an eye out for any visible components that are bent, crooked, or missing. Ideally, the fan shouldnt spin more than 1-1 times. . The newest viscous drives also feature Cold-Start Disengagement, which can help trucks and agricultural tractors warm up faster during cold conditions. It was a junkyard unit off an 03 Envoy. A little heat is a good thing, improving fuel vaporization, performance, and fuel economy it also warms up the cabin in the winter. PDF Visctronic 12 Volt 732/842/882 Fan Drives - BorgWarner Check with diagnostic tool scanner - See if the readings reach the desired levels, 6. 2004-12-07T10:24:41-05:00 How to test a fan clutch - YouTube Fan Clutch. Will go feel it again. DIY: Viscous Fan Clutch - Silicone Oil Refill Pine Hollow Auto Diagnostics 450K views 7 years ago 1995-2004 Toyota Tacoma fan clutch rebuild. Symptoms of a Bad or Failing Fan Clutch | YourMechanic Advice %%EOF I went out and started up the truck and the fan was spinning FAST. From the exterior, a locked-in fan clutch will be hard to diagnose with just a visual check. 0000001016 00000 n 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. 0000001551 00000 n For a better experience, please enable JavaScript in your browser before proceeding. A new radiator fan and thermal fan clutch, ready to keep your engine cool. Viscofans is in no way affiliated to any of the brands shown on this site. There is an air leak in the fan drive. I just joined today and been digging into whether I should replace EV on 2004 Buick Rainier 5.3. If the fan clutch requires repair, take the vehicle to a qualified mechanic. Fan clutch engaged on cold startup on 4.6 V8? | Ford Explorer - Ford I only found it while trying to force it to overheat. Paying attention to your vehicle is the first step in an accurate diagnosis, effective repair, and reliable vehicle. How Does a Viscous Fan Clutch Work? - YouTube A cooling fan clutch is expected to fail over time. There is a very easy way to test the fan clutch for staying fully engaged all the time. `han_aHS{%2hp\MJXB (o_ya;b'aT^)s,_8<9|J]ba[||T-=%9k8^q+dzn.fmUO~7t~4=FiSuY>Q0? 0000002273 00000 n 0000030485 00000 n Honestly, that sounds like normal behavior to me. It may not display this or other websites correctly. Common Fan Clutch Noises And What They Mean | GMB Blog My fan seems to run fast all the time but not loud like the jet engine i've read about. 0000057354 00000 n I replaced it earlier this year while chasing an overheating condition (along with the Water Pump and Thermostat). 2004-12-07T12:21:43-05:00 ()*6789:FGHIJVWXYZefghijtuvwxyz ? No CEL. The fan clutch should be disengaged with no voltage applied. PDF Subject: Troubleshooting Vehicles Equipped with Viscous Fan Drives I feel like I reset something because I've never seen it go slow then engage. A viscous fan clutch contains a thick fluid that can leak from the unit. These fans are more efficient than flex fans that are controlled by engine speed instead of temperature. 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. These fans are needed at slow speeds, typically below 35 mph and at idle. Swap the fan relay with another similar one in the fuse box (headlight IIRC) and see if the problem persists. Always check for manufacturer's specifications for any special procedures. 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 Hmmmmm.. that truck looks awfully familiar. It may be a good idea to check the temperature of a few different vents. By clicking I Accept on this banner you consent to the use of cookies unless you disable them. 57 0 obj <>stream trailer T444E overheat problems - School Bus Fleet Magazine Forums 1. The valve is activated by a pulse width modulation (PWM) output signal from the powertrain control module (PCM).

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