%PDF-1.5 % Horton Fan Clutch - Troubleshooting - Diesel Components, Inc 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. 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. 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. Resurrecting this old thread. Original fan and water pump. How to tell if your Viscous Fan Clutch is Bad - YouTube 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 . No CEL. I replaced it earlier this year while chasing an overheating condition (along with the Water Pump and Thermostat). Overheating constantly, in trafc and on long pulls Check the coolant level. Viscous fan hub; is yours working as it should? - 4WDing Australia While youre at it, consider the performance and fuel economy benefits of upgrading to electric cooling fans. Benjamin Jerew is an ASE-certified Master Automobile Technician with over a decade of experience in auto repair, maintenance, and diagnosis. Motorhomes and RVs | Engine cooling systems Quick tutorial on how to refill your viscous fan clutch with proper fluid and reseal the chamber. 0000060428 00000 n We are working every day to make sure our community is one of the best. It was a junkyard unit off an 03 Envoy. The fan clutch is integral to the safe and efficient operation of your commercial vehicle or application engine. Now what? There are three types of fan clutch, depending on the vehicles design. I just repaired a electro viscous clutch today on my 02 TrailBlazer. ()*6789:FGHIJVWXYZefghijtuvwxyz ? (The previous clutch had loose bearings.) I just want to add another thing to check before declaring the clutch dead. If you need advice on replacing a faulty fan clutch, please get in touch. Like all viscous fan clutches it may be turning, but is it working correctly? One (of many) of my top things to do is service the Transmission. Viscous fan drive technology Precise thermal management that does so much more than keep engines cool. 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. hb```c``Jg`e`fgc@ >(GCPa J0 You should feel some tugging from the fan trying to get it going again. My issue was the fan would only engage intermittently using the Tech 2 and commanding full engagement. 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. I just joined today and been digging into whether I should replace EV on 2004 Buick Rainier 5.3. Adobe Photoshop CS Windows Very interesting info and could be useful to anyone that has a scope and/or high end scanner or Tech 2. [KpB0G8/F7Xl u@qLTAUzpT0F,)xb7J+%*u)EkZ2mJikWc[B, Squeaks while doing it too. 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. They can cause a vehicle to overheat at idle and in heavy traffic. If the fan clutch requires repair, take the vehicle to a qualified mechanic. Include your email address to get a message when this question is answered. Once viscous fluid is in the working chamber, shearing of the fluid results in fan rotation. Then let it get hot. It relies on temp sensor to detect temperature and send signals through ECM/ECU and switches the clutch fan to different levels accordingly. Fan clutch ticking | Ford Explorer - Ford Ranger Forums - Serious Here, you can see where the fan and fan clutch are driven by the engine. PDF Subject: Troubleshooting Vehicles Equipped with Viscous Fan Drives Solenoid coil / Actuator check - Try rotating solenoid coil / actuator and see if it's stuck, 5. The sensor returns a signal pulse through the cooling fan speed signal circuit. This is because the clutch will seem to be in perfect working order, as the fault is on the inside. One of two conditions is possible. %PDF-1.4 % It would definitely do damage. . ` Company No. The fan clutch won't dis engage. This includes heavy- and medium-duty trucks, agricultural tractors, vocational and specialty vehicles. First, see if you can detect any problems with the fan clutch while youre driving. 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? AC little warm. I just repaired a electro viscous clutch today on my 02 TrailBlazer. One smart strategy is to have your vehicles fan clutch and water pump replaced together. Appreciate the help. Secondly, if your viscous fan hub is electronically controlled, check if the wire is unplugged or damaged. Global Parts Distributors has the electronic fan clutch assembly: part number 2911297. These fans are needed at slow speeds, typically below 35 mph and at idle. A viscous fan clutch contains a thick fluid that can leak from the unit. 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. Tech Tip: Electric viscous fan clutches in 2003-09 5.9L Dodge Ram I only found it while trying to force it to overheat. 0000052838 00000 n Thank you! Even if I pull the relay or unplug the fan it still runs fast. 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 hks8>Gw3Lg^Y They contain a drive and driven plate with annular grooves that fill with a thick viscous silicon fluid. The fan won't roar. 0000060995 00000 n (The previous clutch had loose bearings.) Solenoid coil / Actuator check - Try rotating solenoid coil / actuator and see if it's stuck 5. A We had a few overheating issues at Bremer Bay Why is it overlooked? Customer Question. The valve is activated by a pulse width modulation (PWM) output signal from the powertrain control module (PCM). All proceeds go to supporting the site. Equally frustrating is diagnosing the fault. Hope you don't mind me referencing your video? It may not display this or other websites correctly. 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. I just checked, and yes the speed increase and decrease with rpm. The "drive disc" and the "front half" share these closely spaced rings. Resurrecting this old thread. 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. `han_aHS{%2hp\MJXB (o_ya;b'aT^)s,_8<9|J]ba[||T-=%9k8^q+dzn.fmUO~7t~4=FiSuY>Q0? Engine belt stuck on clutch fan, causing solenoid coil/actuator unable to rotate, 1. Has the waterpump bearing seized around the fan shaft? Traces of oil are perfectly normal, and wont necessarily be an indication that your clutch is shot. 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.

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