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. There are three types of fan clutch, depending on the vehicles design. If the air flow feels suspiciously hot or weak, it could just be a bad vent. 0000052661 00000 n Were kidding of course. It was a junkyard unit off an 03 Envoy. 42 36 0000060915 00000 n HWyTSW; * 1d!y ZmK*8gA:s9hG{F;3U9Q]DMNDIBM. We don't all go to a dealer to get work done right away. A failing fan clutch could leave you stranded with expensive repair bills, so pay attention to these symptoms. Ed Beery is an Automotive Specialist and the Owner of InTechgrity Automotive Excellence based in Denver, Colorado. Engine fan consume the largest portion of the energy supply from the engine, up to 10%. [KpB0G8/F7Xl u@qLTAUzpT0F,)xb7J+%*u)EkZ2mJikWc[B, Posted - 02/07/2008 : 5:47:26 PM. It should turn smoothly with some drag. 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 0000001895 00000 n 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. The fan clutch should always engage when the system head pressure reaches in the 240 to 270 lbs range. There is an air leak in the fan drive. If an open or shorted condition has developed in the electronically controlled viscous fan clutch circuit, a Diagnostic Trouble Code (DTC) can be set. As a result, you may think that your fan clutch has seized. My issue was the fan would only engage intermittently using the Tech 2 and commanding full engagement. Fan clutch have a patented System Sentry, which goes about as an early cautioning fuse to alarm the administrator. The fan clutch won't dis engage. ` Wire check - See if the wire to ECU is normal 4. DT Check to make sure each of the bolts holding the fan clutch in place is secure and intact. Truck Repair; Viscus fan on MP8 MACK engine on all the time, happened. The "drive disc" spins freely in the housing except for the silicon fluid. A small amount of resistance always keeps the fan spinning, but its basically free-wheeling until the fan clutch engages. This is considered normal and may last more than 3 minutes in cooler climates or at lower driving speeds resulting in fan roar. Equally frustrating is diagnosing the fault. The fan clutch should be disengaged with no voltage applied. No CEL. 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. Engine fan check - See if any damages on fan, 2. If your unit has one, keep an eye on the temperature so youll know about when the fan speed should begin ramping up. GB 447 5091 38. Resurrecting this old thread. Very good info on the function of the EV Clutch however, the quick function test requires a Tech 2. A bit obvious, but make sure to check the engine management system on your vehicle before anything else. 0000001551 00000 n Standard thermostatic fan clutches will only be present on cars and trucks with rear-wheel drive. Alternatively, an optical tachometer can be used to measure fan speed. ~HO8$/` qAXwx$XA, uHfX m@;d;Hh22Ig 7Ya %%EOF Simply follow the steps below and you rill receive a replacement part number. This article has been viewed 118,630 times. If you are getting that tugging, the clutch is working. One last thing, check the wiring, especially at the clutch connector to ensure there are no broken wires. A For a better experience, please enable JavaScript in your browser before proceeding. the cooling fan using a Hall effect sensor, which reads a reluctor track inside the fan clutch. This fluid's flow is regulated by a bi-metallic spring that opens and closes a control valve. Success stories from users of variable-speed cooling solutions. 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. Overheating constantly, in trafc and on long pulls Check the coolant level. Inspecting the Fan Clutch Manually Download Article 1 Pop the hood. 0000069993 00000 n They contain a drive and driven plate with annular grooves that fill with a thick viscous silicon fluid. Solenoid coil / Actuator check - Try rotating solenoid coil / actuator and see if it's stuck 5. I'm open to ideas. It relies on temp sensor to detect temperature and send signals through ECM/ECU and switches the clutch fan to different levels accordingly. If the ground breaks it's the same. endstream endobj startxref I went out and started up the truck and the fan was spinning FAST. This means that the fan should power down at higher speeds because the rushing air is sufficient for cooling the engine. JavaScript is disabled. I've been trying to read as many of these waterpump/fan post as possible. Too fast to try and slow it with a rag. Here, you can see where the fan and fan clutch are driven by the engine. Thank you! Viscous fan clutch is going to be the norm when more industrial engine uses ECM/ECU. 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. Fan Clutch Symptoms of a Locked-in Fan Clutch. Before you go looking for your fan clutch, make sure your vehicle is in park, with the engine off and the handbrake firmly engaged. 0000070141 00000 n 2 I think its doing what u r saying, just hard to tell how hard it should be trying to pull out of hand. 0000069624 00000 n Not everyone has a scanner that can command the fan clutch. 0000070596 00000 n Manufacturers names, logos, part numbers and descriptions are used for reference purposes only and are not intended to indicate that our fans, fan clutches or fan assemblies are made by the OEM. The issue actually turned out to be a minor blown head gasket, with coolant slowly being shifted into the overflow bottle at high RPM and not being sucked back in, but the engine was able to get warmer because the viscous fan clutch wasn't working properly. A viscous fan clutch enables the fan to more or less freewheel . 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 On the other hand, too much heat can be a big problem, melting non-metal engine parts and rendering lubricating oil useless. 77 0 obj <>stream When this happens, many of the symptoms described above can be experienced. that did the trick. Squeaks while doing it too. When a leak occurs, it's at the bearing seal, at the center rear of. xref By clicking I Accept on this banner you consent to the use of cookies unless you disable them. If the fan clutch is going bad or has failed, there are a couple of ways you may notice. I only found it while trying to force it to overheat. Always check for manufacturer's specifications for any special procedures. 0000066631 00000 n 0000002273 00000 n This is because the clutch will seem to be in perfect working order, as the fault is on the inside. Okay, so in your other post to me about testing it you say that the one in this video is bad. 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. 2004-12-07T12:21:43-05:00 If it feels the same, then I would assume the clutch is done. For more information about ASE, visit the official ASE website at www.ase.com, Copyright 2008-2023 All Rights Reserved Privacy Policy Disclaimer Sitemap. 57 0 obj <>stream It may be a good idea to check the temperature of a few different vents. Viscous drives tend to have the first two issues. Its possible to upgrade from a non-thermal clutch to a more efficient thermal model, but not the other way around. 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). Locked-in fan clutch symptoms. Resurrecting this old thread. As the engine speed increases, the blades of a flex fan change their angle. Thank u LB. 3000000/10000 trailer 0000025483 00000 n Some viscous properties of the fan hub may vary the res 0000066928 00000 n No CEL. ELK\KHA(gYIm|eTjQ Gb$cqla7?Nf$77X!ry~1h1,amo 2jI&zI? Z;:QJ-uvgMq4Z(*n *ER"Mvz. There are 7 references cited in this article, which can be found at the bottom of the page. It was a junkyard unit off an 03 Envoy. adobe:docid:photoshop:2ce534b1-d8a3-11d8-a54e-a63691f3af4c These fans are needed at slow speeds, typically below 35 mph and at idle. Unit 6 Scandinavia CourtChain Bar RoadCleckheatonBD19 3QW UK. You should be able to hear it from where you're sitting inside the cabin of the vehicle. VAT No. Roaring. Usually a bad or failing fan clutch will produce a few symptoms that can alert the driver of a potential issue. Also verify no indication of viscous fluid leakage. If you still need assistance, contact our customer service team at (800) 810-9110. Quick tutorial on how to refill your viscous fan clutch with proper fluid and reseal the chamber. Our community has been around for many years and pride ourselves on offering unbiased, critical discussion among people of all different backgrounds. The fan fault is logged in your engine management system. We had a few overheating issues at Bremer Bay Why is it overlooked? 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. No one enjoys a vehicle or application breaking down: No one. Could not find any bad wires, just looseness in the actual pins inside the connector. If it spins more than three full rotations, this indicates that it may be prone to slipping. Im pretty sure that is why this method is posted. By landing on this page, were guessing you know exactly what one does: This is what a fan clutch does, if youre unsure. 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. Like any other part, fan clutches can develop issues that, if left unchecked, can be both devastating and costly. Seek the source of issue elsewhere, Possible Cause: The outer part or solenoid coil has signs of fluid leaking. OK. Quick tutorial on how to refill your viscous fan clutch with proper fluid and reseal the chamber. You do realize that you are posting things that don't work for the everyday person trying to figure out his problem. 0000037348 00000 n Due to their control by the engine computer, they don't experience air leaks. Last Updated: August 7, 2022 Company No. It may work at 100% but maybe not at 20-30%. The PCM supplies a 5-volt reference and a low reference to the Hall effect sensor. Check the gauge for proper operation (especially electric gauges). 1 hz on the cooling fan speed signal circuit equals about 1 rpm of actual fan speed. Original fan and water pump. Suggestion: Clutch fan isn't the source of the issue. From the exterior, a locked-in fan clutch will be hard to diagnose with just a visual check. Horton VMaster Ultra (Stratis) Viscous Fan Drive Troubleshooting Guide Engine feature code 12THX GENERAL OPERATION (ALL ENGINES) Horton VMaster is a variable speed drive. 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 Honestly, that sounds like normal behavior to me. When it happens its especially hard to take when you need your vehicle or application to finish a job. Install the Horton EC450 TM Fan Clutch on the engine. Try it again but pull the fan relay. Hmmmmm.. that truck looks awfully familiar. Time for a Radiator-Heater Core Flush? I feel like I reset something because I've never seen it go slow then engage. Fan Clutch. Stopped with rag pushed in for a few minutes but couldnt see any temp rise, with air on, but its 55F here. Make sure your new fan clutch is the same type as the original. 42 0 obj <> endobj 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. Contact Whatsapp: +6012 879 3220 if you need any product! 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. X Sometimes a customer will complain about a roaring noise coming from the engine bay. It disengaged once at 206 degrees, another time at 217 degrees but sometimes it stays engaged. If you have difficulty rotating or it's just stuck, then it could be either foreign object or clutch fan. I'm open to ideas. 1988467. Any input would be appreciated. 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. DIY: Viscous Fan Clutch - Silicone Oil Refill Pine Hollow Auto Diagnostics 450K views 7 years ago 1995-2004 Toyota Tacoma fan clutch rebuild. 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? Solenoid coil / Actuator check - Try rotating solenoid coil / actuator and see if it's stuck, 5. For more information about how to test a fan clutch, such as other signs to look for which indicate damage, read on. Initially I get a Trans Flush at Hello, everyone. The pwm feed is positive so if that breaks it defaults to unlocked. gave the two in question a little twist with a fine nosed pliers. If the clutch is constantly engaged, the vehicle will suffer from poor gas mileage and loss of horsepower. Nearly unheard of on modern cars with electric engine cooling fans, people sometimes still refer to the accessory drive belts as fan belts. This term harkens to the day when cars and trucks used drive belts to drive the cooling fan or water pump. &\cUj If the clutch does not engage when the AC is turned on when a voltage is present is a sign that the fan is damaged. Adobe d 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 necessary, use the hood strut to hold the hood up so you can work unobstructed. Check the assembly for leaks through the seams and around the shaft. 3000000/10000 The fluid flows from a reservoir to the plate area at higher engine temperatures and returns to let the fan spin more freely as the engine cools. The valve is activated by a pulse width modulation (PWM) output signal from the powertrain control module (PCM). You are using an out of date browser. hb```c``Jg`e`fgc@ >(GCPa J0 The sensor returns a signal pulse through the cooling fan speed signal circuit. Throw away the ruined newspaper Rev the engine, you should notice that the fan increases speed, but not proportionally to the crank speed. {"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":"