Swap the fan relay with another similar one in the fuse box (headlight IIRC) and see if the problem persists. rS&cD5Ts6'E7FdU()8GHVe*9:IJWXYZftugvwhijxyz i !1AQa"q2#BR 3br$Csc%4S5&DTdEU' Like any other part, fan clutches can develop issues that, if left unchecked, can be both devastating and costly. A cooling fan clutch is expected to fail over time. PDF IK0900075 - Horton Stratis Fan Hub Diagnostics Page 1 of 13 o! Most clutches will fade with time as spring-type clutches lose thermal sensitivity and fluid-filled clutches lose fluid viscosity. This should lock the clutch and pull air like a dump truck. Viscous drives tend to have the first two issues. Quick tutorial on how to refill your viscous fan clutch with proper fluid and reseal the chamber. I keep using it as an example on how to test the fan so thought it would be prefect for this article. B=uJqc-I]-Y;6?VGx#qL.Vb&3Lv.EA5NYH$9&V=%n" A Alternatively, an optical tachometer can be used to measure fan speed. Fan clutch have a patented System Sentry, which goes about as an early cautioning fuse to alarm the administrator. DIY: Viscous Fan Clutch - Silicone Oil Refill Pine Hollow Auto Diagnostics 450K views 7 years ago 1995-2004 Toyota Tacoma fan clutch rebuild. Ed Beery is an Automotive Specialist and the Owner of InTechgrity Automotive Excellence based in Denver, Colorado. Viscous fan clutches are belt-driven and found on many older rear-wheel-drive passenger cars. 0000069649 00000 n This is true, especially if the fault is in the engine cooling system and youre unsure the fan clutch symptoms to look for. A bum fan clutch drains horsepower from the engine to keep the mechanical fans running, which can ultimately lead to critical overheating, decreased fuel economy, and poor general performance. Usually a bad or failing fan clutch will produce a few symptoms that can alert the driver of a potential issue. Some viscous properties of the fan hub may vary the res . 3000000/10000 0000025483 00000 n '06 Trailblazer LS, '14 Silverado LT Z71, and '17 Jeep Renegade Trailhawk, "Chance Favors The Prepared Mind" Dr. Louis Pasteur, You can't have my fish, but if you ask nicely, I'll help you catch your own. Im pretty sure that is why this method is posted. All rights reserved. tt4*ittd830z02OL0 p These elements are natural in the process of Writing in a foreign language. 1. Thank you! Troubleshooting Common Condenser Fan Problems, Signs and Symptoms of Spark Plug Problems, Reasons Why Your Car's Idle Speed Might Be Too High, Engine Ignition and Cam Timing for the Novice, Troubleshooting Engine Driveability Problems: Surging or Misfiring. Engine fan consume the largest portion of the energy supply from the engine, up to 10%. The valve is activated by a pulse width modulation (PWM) output signal from the powertrain control module (PCM). The sensor returns a signal pulse through the cooling fan speed signal circuit. ELK\KHA(gYIm|eTjQ Gb$cqla7?Nf$77X!ry~1h1,amo 2jI&zI? Z;:QJ-uvgMq4Z(*n *ER"Mvz. How to Test a Fan Clutch: 11 Steps (with Pictures) - wikiHow There is an air leak in the fan drive. This includes heavy- and medium-duty trucks, agricultural tractors, vocational and specialty vehicles. If you want to determine the extent of the problem, you can use a probe thermometer to read the exact temperature of the air flowing through the radiator. With more than eight years of experience, he specializes in providing maintenance and repair services for both individuals and companies. I replaced it earlier this year while chasing an overheating condition (along with the Water Pump and Thermostat). Wire check - See if the wire to ECU is normal, 4. It's often compared to a jet engine. Suggestion: Normally it has nothing to do with clutch fan. But in the late 1950s, viscous fan clutches began to appear. endstream endobj startxref This is because the clutch will seem to be in perfect working order, as the fault is on the inside. If the noise from the engine is too loud, try popping the hood to prevent the sound from being muffled. Virtually any on- or off-highway engine can benefit from viscous cooling technology. They can cause a vehicle to overheat at idle and in heavy traffic. For your own safety, you should never attempt to manually test your fan clutch while the vehicle is running. Locked-in fan clutch symptoms. Check the gauge for proper operation (especially electric gauges). I'm open to ideas. This animation of Horton's latest variable-speed fan drive, the LCX, shows viscous cooling technology in action. Secondly, if your viscous fan hub is electronically controlled, check if the wire is unplugged or damaged. Squeaks while doing it too. Check Mechanical Integrity of Clutch With engine off, rotate fan by hand. Thanks for the quick response. It disengaged once at 206 degrees, another time at 217 degrees but sometimes it stays engaged. We use cookies and similar web technologies to recognize your repeat website visits and preferences and to analyze traffic. From the exterior, a locked-in fan clutch will be hard to diagnose with just a visual check. 0000052661 00000 n Yes, the one in this video is bad. X Has the waterpump bearing seized around the fan shaft? Viscous Fan Clutch Not Working and Troubleshoot Guide (The previous clutch had loose bearings.) Overheating constantly, in trafc and on long pulls Check the coolant level. Get Started > Always in stock Fan Clutch Replacement - Popular Mechanics Even if I pull the relay or unplug the fan it still runs fast. 0000001016 00000 n 1988467. 0000069624 00000 n You could also put 12v+ to the white wire at the clutch (or at the relay if you can figure out which terminal it is). As you could imagine, trying to stop a locked fan with a rag would not be a pleasant experience. If the fan clutch requires repair, take the vehicle to a qualified mechanic. The fan clutch should be disengaged with no voltage applied. A little heat is a good thing, improving fuel vaporization, performance, and fuel economy it also warms up the cabin in the winter. startxref 0000014403 00000 n Initially I get a Trans Flush at Hello, everyone. I'm open to ideas. Truck Repair; Viscus fan on MP8 MACK engine on all the time, happened. Include your email address to get a message when this question is answered. Original fan and water pump. We use cookies to make wikiHow great. All browsing and transactions within are secured by an SSL Certificate with high-strength encryption. To learn more about cookies, including steps for disabling, view our Privacy Policy. hb```"wVF/3 1K6l|Z+W9"qHg6Engl!z,A& qx3h9@ -Vb5$?%?@,#Xj~aXSFe40hXmW{|o\ s2WIp?k2pUiF 0 gA The fan clutch unit is approximately 1 foot tall by 1 foot wide. There is a very easy way to test the fan clutch for staying fully engaged all the time. AC little warm. Hold your hand a few inches away from the vent so slight variations in temperature will be more noticeable. 0000060378 00000 n 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 Check the assembly for leaks through the seams and around the shaft. [KpB0G8/F7Xl u@qLTAUzpT0F,)xb7J+%*u)EkZ2mJikWc[B, 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. 3000000/10000 I agree, a T444E will get hot easily unless cooled well, so the fan clutch is critical. E&OE All information displayed on this website is correct at the time of publication but is subject to change. 2021 Viscofans. Global Parts Distributors has the electronic fan clutch assembly: part number 2911297. `han_aHS{%2hp\MJXB (o_ya;b'aT^)s,_8<9|J]ba[||T-=%9k8^q+dzn.fmUO~7t~4=FiSuY>Q0? 42 0 obj <> endobj ~HO8$/` qAXwx$XA, uHfX m@;d;Hh22Ig 7Ya Also when I first press the gas pedal it seems like the engine wants to stall which is probably something totally different? . 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. HWyTSW; * 1d!y ZmK*8gA:s9hG{F;3U9Q]DMNDIBM. All it does is freewheel and has no resistance. 2 A small amount of resistance always keeps the fan spinning, but its basically free-wheeling until the fan clutch engages. All Tsab 36K views 4 years ago How to know if. Check All Cooling System Components Radiator, water pump, thermostat, temperature gauge, fault codes, etc. Viscous fan drives | Variable speed fan clutch Set the PDF Electronically Controlled Viscous Cooling Fan When this happens, many of the symptoms described above can be experienced. No one enjoys a vehicle or application breaking down: No one. The fan won't roar. A properly-functioning fan clutch is critical to engine reliability, as it works to maintain a safe temperature range. 1 hz on the cooling fan speed signal circuit equals about 1 rpm of actual fan speed. adobe:docid:photoshop:f99bcbb8-4863-11d9-b0f7-b8eb50f766bb It may work at 100% but maybe not at 20-30%. OK. Try it again but pull the fan relay. If the air flow feels suspiciously hot or weak, it could just be a bad vent. It would definitely do damage. Standard thermostatic fan clutches will only be present on cars and trucks with rear-wheel drive. A locked-in, or seized, fan clutch can cause radiator fans to fully engage at all speeds. Has the waterpump bearing seized around the fan shaft? Clutch slipping and eventual failure are normal with time. As fan clutch specialists, weve seen plenty of faulty viscous drives in our time. Okay, so in your other post to me about testing it you say that the one in this video is bad. A failing fan clutch could leave you stranded with expensive repair bills, so pay attention to these symptoms. Now somethimes it only gets to halfway to 210, even in the summer. You are also talking to people that have been doing this for a while on this platform. If your fan clutch has gone bad, replace it as soon as possible to prevent engine damage. Solenoid coil / Actuator testor - Test solenoid coil / Actuator if you have an actuator tester. The PCM never puts it to 100%, 90% is the highest and that's at very high engine temps. Viscous Fan Clutch | Kit Masters 0000001342 00000 n I have a 2003 EXT 4WD Trailblazer 235,000 miles. How to Tell If Your Fan Clutch Is Going Bad - LiveAbout This is considered normal and may last more than 3 minutes in cooler climates or at lower driving speeds resulting in fan roar. 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. Clutch fan check - See if any visible damage on clutch fan, 3. wikiHow is where trusted research and expert knowledge come together. This means that the fan should power down at higher speeds because the rushing air is sufficient for cooling the engine. When cruising, the vehicle moving through the air pushes air through the radiator, cooling the engine. A new radiator fan and thermal fan clutch, ready to keep your engine cool. I released it and it took about 30 sec to a minute to get back up to speed and then I heard it engage and spin faster. If an open or shorted condition has developed in the electronically controlled viscous fan clutch circuit, a Diagnostic Trouble Code (DTC) can be set. DT 0000070141 00000 n 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. Possible Cause: Damaged engine fan usually caused by friction, wear or entry of foreign objects. 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. -Determine if the fault is mechanical or electrical(and then follow the appropriate troubleshooting steps) . ()*6789:FGHIJVWXYZefghijtuvwxyz ? Before you go looking for your fan clutch, make sure your vehicle is in park, with the engine off and the handbrake firmly engaged. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/4\/42\/Test-a-Fan-Clutch-Step-1.jpg\/v4-460px-Test-a-Fan-Clutch-Step-1.jpg","bigUrl":"\/images\/thumb\/4\/42\/Test-a-Fan-Clutch-Step-1.jpg\/aid9382520-v4-728px-Test-a-Fan-Clutch-Step-1.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"