viscous fan clutch troubleshooting viscous fan clutch troubleshooting
Simply follow the steps below and you rill receive a replacement part number. Electronic-Viscous Fan Clutch Troubleshooting During engine start up, the EV fan clutch will engage and match engine speed for up to 3 minutes. Its possible to upgrade from a non-thermal clutch to a more efficient thermal model, but not the other way around. Fan Clutch Symptoms of a Locked-in Fan Clutch. You must log in or register to reply here. see page 3 of the GM Techlink Document I have attached. All it does is freewheel and has no resistance. If it feels the same, then I would assume the clutch is done. Success stories from users of variable-speed cooling solutions. I feel like I reset something because I've never seen it go slow then engage. If an open or shorted condition has developed in the electronically controlled viscous fan clutch circuit, a Diagnostic Trouble Code (DTC) can be set. I replaced it earlier this year while chasing an overheating condition (along with the Water Pump and Thermostat). By clicking I Accept on this banner you consent to the use of cookies unless you disable them. Quick tutorial on how to refill your viscous fan clutch with proper fluid and reseal the chamber. A locked-in, or seized, fan clutch can cause radiator fans to fully engage at all speeds. The fan clutch is integral to the safe and efficient operation of your commercial vehicle or application engine. GB 447 5091 38. First, see if you can detect any problems with the fan clutch while youre driving. Virtually any on- or off-highway engine can benefit from viscous cooling technology. Solenoid coil / Actuator testor - Test solenoid coil / Actuator if you have an actuator tester. 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. 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. 0000060995 00000 n It may be a good idea to check the temperature of a few different vents. 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. Stopped with rag pushed in for a few minutes but couldnt see any temp rise, with air on, but its 55F here. Firstly, check to make sure something hasnt gotten caught or wrapped up around the back of the viscous fan clutch. Now somethimes it only gets to halfway to 210, even in the summer. I keep using it as an example on how to test the fan so thought it would be prefect for this article. Wire check - See if the wire to ECU is normal, 4. Anyone seen a case where the EV Fan Clutch DISENGAGES completely? With more than eight years of experience, he specializes in providing maintenance and repair services for both individuals and companies. I just checked, and yes the speed increase and decrease with rpm. Found loose internal connections at the harness connector on the clutch and tightened them up a bit. 0000053141 00000 n The sensor returns a signal pulse through the cooling fan speed signal circuit. ELK\KHA(gYIm|eTjQ Gb$cqla7?Nf$77X!ry~1h1,amo 2jI&zI? Z;:QJ-uvgMq4Z(*n *ER"Mvz. Due to their control by the engine computer, they don't experience air leaks. trailer In addition to regulating engine temperatures with razor-sharp precision, viscous-operated fan drives can produce lower emissions, decrease noise pollution, provide fuel savings and ultimately increase performance. Yes, the one in this video is bad. Fan Clutch. Make sure your new fan clutch is the same type as the original. So you suspect that your fan clutch is defective. I only found it while trying to force it to overheat. We are working every day to make sure our community is one of the best. I took a rag and dragged it against the outer part of the fan and was able to slow it with some firm pressure and eventually stopped it. 0 For more information about ASE, visit the official ASE website at www.ase.com, Copyright 2008-2023 All Rights Reserved Privacy Policy Disclaimer Sitemap. Then let it get hot. If it feels rough or does not turn then replace the drive. Normally it's caused by faulty clutch fan, Possible Cause: Clutch fan wire got cut/pulled by foreign factors. If not, it's defective. You can also perform this test while the vehicle is parked and in neutral gear. If you still need assistance, contact our customer service team at (800) 810-9110. Front-wheel drive vehicles are equipped with a completely different cooling system due to the way the engine is configured. Squeaks while doing it too. hbbd``b`:$@. 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. Adobe d I dont want to go near the fan and try and stop it. Squeaks while doing it too. A bit obvious, but make sure to check the engine management system on your vehicle before anything else. 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. Shows the signals to and from the the fan and how the fan operates when commanded by the PCM and the scanner. Truck Repair; Viscus fan on MP8 MACK engine on all the time, happened. Global Parts Distributors has the electronic fan clutch assembly: part number 2911297. B=uJqc-I]-Y;6?VGx#qL.Vb&3Lv.EA5NYH$9&V=%n" o! You do realize that you are posting things that don't work for the everyday person trying to figure out his problem. Wanted to get some input/feed backI have always done basic maintenance after purchasing a used vehicle regardless of what or anything that I know from the previous owner that's been serviced. I went out and started up the truck and the fan was spinning FAST. The one in this video is bad? Even when the drive is off the fan will spin between 50-300 rpm. adobe:docid:photoshop:f99bcbb8-4863-11d9-b0f7-b8eb50f766bb In most cases, fan blades are designed to flex up to. This is considered normal and may last more than 3 minutes in cooler climates or at lower driving speeds resulting in fan roar. A roaring noise could mean a number of things, including a bad wheel bearing, worn tires, or a differential that's low on oil. We use cookies and similar web technologies to recognize your repeat website visits and preferences and to analyze traffic. A viscous fan clutch contains a thick fluid that can leak from the unit. Okay, so in your other post to me about testing it you say that the one in this video is bad. 1 When I say it disengages, I mean it coasts to a stop! Horton VMaster Ultra (Stratis) Viscous Fan Drive Troubleshooting Guide Engine feature code 12THX GENERAL OPERATION (ALL ENGINES) Horton VMaster is a variable speed drive. 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. EC450TM Fan Clutch NOTE Do not loosen the P-clamp attaching the wiring harness to the metal tab on the Fan Clutch. 2004-12-07T10:24:41-05:00 Check Mechanical Integrity of Clutch With engine off, rotate fan by hand. 0000035283 00000 n While youre at it, consider the performance and fuel economy benefits of upgrading to electric cooling fans. 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. 0000057354 00000 n This animation of Horton's latest variable-speed fan drive, the LCX, shows viscous cooling technology in action. This fluid's viscosity is measured in CST or centistokes and degrades over time. The PCM never puts it to 100%, 90% is the highest and that's at very high engine temps. Try it again but pull the fan relay. Posted - 02/07/2008 : 5:47:26 PM. Last Updated: August 7, 2022 0000052838 00000 n Customer Question. I'm open to ideas. This condition will cease shortly upon disengagement. 0000002179 00000 n Swap the fan relay with another similar one in the fuse box (headlight IIRC) and see if the problem persists. VAT No. The fan clutch unit is approximately 1 foot tall by 1 foot wide. 0000070596 00000 n >Vyzy{=sUt\z^{W{7^sU:GWEzz5x=^s^[=^s+^o=^s{O=:y{^o==r. If the fan still hasnt kicked in by the time temperature reaches about 200F (93C), you can be sure that theres a problem somewhere. 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. 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. The fan needs to operate within the limits at each test point.The fan should engage and remain engaged during the entire engagement request. I'm open to ideas. No CEL. These fans are needed at slow speeds, typically below 35 mph and at idle. Viscous drives tend to have the first two issues. This fluid's flow is regulated by a bi-metallic spring that opens and closes a control valve. Include your email address to get a message when this question is answered. The newest viscous drives also feature Cold-Start Disengagement, which can help trucks and agricultural tractors warm up faster during cold conditions. We don't all go to a dealer to get work done right away. As engine temperature increases, look for a sudden jump in fan speed. Suggestion: Clutch fan isn't the source of the issue. the cooling fan using a Hall effect sensor, which reads a reluctor track inside the fan clutch. 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. A binding fan clutch will typically be accompanied with warm air flow from the A/C, since the fan isnt turning the way it should be. You are also talking to people that have been doing this for a while on this platform. 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. 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. Coolant temperature sensor circuit problems can set a DTC. 0000002090 00000 n Once viscous fluid is in the working chamber, shearing of the fluid results in fan rotation. If you need advice on replacing a faulty fan clutch, please get in touch. One of two conditions is possible. Then test the fan clutch by giving it a good push. All Tsab 36K views 4 years ago How to know if. Engine overheating at low speed or when stopped is the most-common fan clutch failure symptom. Now what? 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 Keep your engine temperature below 210F (99C) while youre running your tests to prevent it from overheating. I have a 2003 EXT 4WD Trailblazer 235,000 miles. Resurrecting this old thread. These fans are more efficient than flex fans that are controlled by engine speed instead of temperature. 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). A noisy, constant droning noise from the fan. 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. Quick tutorial on how to refill your viscous fan clutch with proper fluid and reseal the chamber. The wires run in a rubber hose in front of the fan. 450 xref 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. When cruising, the vehicle moving through the air pushes air through the radiator, cooling the engine. Thank u LB. HWyTSW; * 1d!y ZmK*8gA:s9hG{F;3U9Q]DMNDIBM. Check to make sure each of the bolts holding the fan clutch in place is secure and intact. 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.
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