This article has been viewed 118,630 times. hbbd``b`:$@. Anyone seen a case where the EV Fan Clutch DISENGAGES completely? Success stories from users of variable-speed cooling solutions. 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. Firstly, check to make sure something hasnt gotten caught or wrapped up around the back of the viscous fan clutch. Simply follow the steps below and you rill receive a replacement part number. All rights reserved. It was a junkyard unit off an 03 Envoy. The PCM never puts it to 100%, 90% is the highest and that's at very high engine temps. On the other hand, too much heat can be a big problem, melting non-metal engine parts and rendering lubricating oil useless. PDF Electronically Controlled Viscous Cooling Fan This fluid's viscosity is measured in CST or centistokes and degrades over time. Fan clutch ticking | Ford Explorer - Ford Ranger Forums - Serious 0000002179 00000 n As engine temperature increases, look for a sudden jump in fan speed. It may work at 100% but maybe not at 20-30%. The engine temp reads a little low all the time, about 2-3 notches below 210. 0000035192 00000 n In our 97-98 AmTran REs, the 444s run 210* all the time, sometimes a little less in the winter, in the summer, the fans are almost constant on, and if it's hot enough (85-90* outside) they'll hit 230* under load. During engine start up, the EV fan clutch will engage and match engine speed for up to 3 minutes. . All Tsab 36K views 4 years ago How to know if. Solenoid coil / Actuator check - Try rotating solenoid coil / actuator and see if it's stuck, 5. 0000014403 00000 n A bad fan clutch can cause engine problems like excessively high temperatures and poor performance. Traces of oil are perfectly normal, and wont necessarily be an indication that your clutch is shot. They contain a drive and driven plate with annular grooves that fill with a thick viscous silicon fluid. 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? wikiHow is where trusted research and expert knowledge come together. 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. T444E overheat problems - School Bus Fleet Magazine Forums Normal solenoid coil electric current should be 40mA to 60mA. We recommend that you check the transducer and fan clutch assembly. Some fan clutches are designed with a built-in thermometer somewhere on the instrument panel. 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. I feel like I reset something because I've never seen it go slow then engage. 0000070596 00000 n 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. 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. It would definitely do damage. Yes, the one in this video is bad. Viscous Fan Clutch Operation Symptoms - FreeASEStudyGuides.com Resurrecting this old thread. My issue was the fan would only engage intermittently using the Tech 2 and commanding full engagement. JavaScript is disabled. Inspecting the Fan Clutch Manually Download Article 1 Pop the hood. startxref It was a junkyard unit off an 03 Envoy. Listen out for a gentle roar from the fan clutch when youre driving at least 50 miles per hour, as this can indicate that its binding or locking up. All browsing and transactions within are secured by an SSL Certificate with high-strength encryption. This fluid's flow is regulated by a bi-metallic spring that opens and closes a control valve. If the fan clutch requires repair, take the vehicle to a qualified mechanic. 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. Give us some info about your project, and a Horton rep will contact you. This includes heavy- and medium-duty trucks, agricultural tractors, vocational and specialty vehicles. rS&cD5Ts6'E7FdU()8GHVe*9:IJWXYZftugvwhijxyz i !1AQa"q2#BR 3br$Csc%4S5&DTdEU' If the noise from the engine is too loud, try popping the hood to prevent the sound from being muffled. You should probably slow your role a little and do more reading. I replaced it earlier this year while chasing an overheating condition (along with the Water Pump and Thermostat). This means that the fan should power down at higher speeds because the rushing air is sufficient for cooling the engine. 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. Company No. Thanks to all authors for creating a page that has been read 118,630 times. 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. Posted - 02/07/2008 : 5:47:26 PM. Hold your hand a few inches away from the vent so slight variations in temperature will be more noticeable. Check the assembly for leaks through the seams and around the shaft. Tuning and Understanding your Toyota Viscous Fan Clutch % of people told us that this article helped them. Clutch fan check - See if any visible damage on clutch fan, 3. Anyone seen a case where the EV Fan Clutch DISENGAGES completely? 0000002090 00000 n Electronic-Viscous Fan Clutch Troubleshooting During engine start up, the EV fan clutch will engage and match engine speed for up to 3 minutes. The 2 halves opened. Swap the fan relay with another similar one in the fuse box (headlight IIRC) and see if the problem persists. If the clutch is constantly engaged, the vehicle will suffer from poor gas mileage and loss of horsepower. 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. By . Also when I first press the gas pedal it seems like the engine wants to stall which is probably something totally different? Seek the source of issue elsewhere, Possible Cause: The outer part or solenoid coil has signs of fluid leaking. {"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":"