shutters are used to control the FD-2. A fan clutch is a temperature-controlled coupling between the water pump shaft and the fan which allows the fan to be operational at low speeds and disconnected at higher speeds. Changed it out again this past weekend stopped over heating but now less power? These rapid, high speed engagements aren’t good for the fan clutch and can cause the liner to prematurely wear out. The timer limits fan cycling and can extend the life of fan clutches and related equipment. In contrast, in a front-wheel drive vehicle, the engine is usually mounted laterally, with the crankshaft and typically all the major accessory shafts parallel to the front axle, so as to directly drive the transaxle; a fan mechanically mounted on an accessory pulley would blow sideways and would not face the radiator. Clutch should lock up and be difficult to turn by hand. Fan settings above 2 will set the rear fan speed to high. The temperature within the vehicle is thermostatically controlled. So let’s start with the basics: All clutches—whether K&L’s mechanical clutches, air clutches, or hydraulic clutches—work essentially the same way, and provide the same larger function. Clutch fans are available via two operations: thermal and non-thermal. 1. K30 Aluminum Rear Air Clutch 5” Diameter Fan Pilot 1090-09750-01 –K32 1090-29750-01 –DuroSpeed™ Revision 20150417 / 033-CM-0000163. … A bi-metal thermal spring is located on the front of the fan that expands or contracts based on heat from the air passing through the radiator. The key terms and parameters used in selecting fans, designing systems, and controlling fluid flow are discussed. Because the crankshaft drives this fan, check the accessory drive belt for wear and glazing. An object of the invention is to provide a fan and clutch control circuit for controlling the operation and speed of a fan of an air conditioner over a preselected temperature range and for also controlling the operation of a magnetically operated clutch to drive a compressor of the air conditioner at selected temperatures. The main types are non-thermal, thermal, and electronic — all of which use a silicone fluid to engage and disengage your fan. Repair Kits Clutch Repair Kit and Replacement Guide - 12 - On/Off Fan Drive Diagnostic and Service Guide K32 Steel 2 9/ 16 ” Fan Pilot Pictured PartNumber Product Description 1090-09650-0xx K32 SteelRear Air Clutch 2 9/ 16 ” Diameter Fan … Steps 1-2 1. valve (see Figure 5). What should the normal cut in and cutout temp. The valve then releases a heavy silicone fluid, which locks the fan blades to the fan pulley. Armed with this information, you can identify a bad fan clutch and replace it with the proper aftermarket option. Also, when the air pump is not rotating, air can not flow backwards due to the unique sealing design. Has the radiator been flushed within the last 4 years? Steps 1-2 1. At one level, clutches really are that simple. REBUILD KITS REMANS 2-SPEED VISCOUS FANS. You are talking about electric fans. The thermal fan clutch operates in response to underhood temperatures. operation, or maintenance information which is important but not hazard related. Verify clutch operation. These provide the potential to control the level of engagement depending on any number of inputs. Clutch operating correctly, Kysor fan drives are spring engaged and air released. 3. A viscous fan clutch … I. Connect air … If the clutch is always engaged, the vehicle will suffer from poor gas mileage and loss of horsepower. Does Your Fan Clutch Cycle Too Much? Incorrect air pressure to the fan clutch. Users already familiar with fan system operation may want to skip this section. I replaced the heat senser located near the themostat. Fan speed does not increase when engine is hot. If so what would be its location on the engine? This heats up a small bi-metallic coil in the face of the fan clutch, releasing an internal valve. NOTE To assure maximum horsepower carrying capacity of the Fan Clutch and to prevent damage to the Fan Clutch, there must be an operating pressure of 90 to 120 PSI to the Fan Clutch upon engagement. The fan clutch is a device controlling the engagement of the EC fan. Re-engagement bleeds the air out of the system, a set of springs release, and the clutch reattaches to the flywheel. Thermal Fan Clutches, however, are the most efficient form of engine driven fans. Fan blade tip moves more than 1/4-inch front to back. Leaking fluid or oily build up around the bearing or thermal spring. On modern vehicles the solenoid receives signals to turn on and off from the engine’s ECU. What should the normal cut in and cutout temp. Any interruption of the air supply will allow the fan to run, keeping it in fail-safe mode. Engine fan with viscous drive. Grab. Wait for the engine to cool down to dead cold and start it up; most fans will turn some whenever the engine's running, but they shouldn't be running hard enough to hear from inside the car with the hood shut. Fan Control Air Conditioner TimerSpecify the minimum amount of time the fan will run after activation due to Air Conditioner Pressure switch input. In this feature, we’ll explain how the Horton fan clutch works, what maintenance it requires and importantly what to keep an eye on . The first sign of a fan clutch stuck in the permanently engaged position is a fan that never shuts off. Align two holes in clutch plate with two holes in sheave. As the spring is heated, it turns and allows valve ports to open within the clutch. I have changed out my fan clutch 3 times already and my car is still over heating? If the fan clutch is spinning from the moment the cold engine is started, you will need to replace the fan clutch. Highest Torque Rating . n Maintenance: Clutch Series Fan clutch maintenance should be performed at every "A" PM schedule, at every oil drain, or every 25,000 miles (40,225 KM), which ever comes first. Thermal Fan Clutches are a little more sophisticated in operation than non-thermal fan clutches. Some clutches are electronically controlled (instead of bi-metallic strip). This is easier to accomplish because the engine is mounted longitudinally, with the belt accessory components mounted facing the radiator. Fleetrite Fan Clutches . Silicone fluid stored inside a reservoir is allowed to pass through these open ports and enter the working area of the clutch. When the engine’s coolant reaches the fan-on coolant temperature, compressed air inside the fan hub is exhausted to let the internal fan clutch spring apply pressure on … Sustaining fan blade engagement requires a large amount of torque. I want to replace my fan clutch but when I go to the auto parts store they ask me for the ratios and say there is supposed to be a stamp on the old part but I don’t see it how do I know which one I need ? It is controlled by a temperature sensitive air. Is there another senser I should replace? Maintenance Fan clutch maintenance should be performed at every “A” PM schedule, at every oil drain or every 25,000 miles (40,225 km), whichever comes first. A fan clutch is a thermostatic engine cooling fan that can freewheel at low temperatures when cooling is not needed, allowing the engine to warm up faster, relieving unnecessary load on the engine. Verify clutch operation. FAN CLUTCH CATALOG. GENERAL. The air pressure is vented to ENGAGE the fan. The fan clutch is just what the name says, it is a mechanism that will clutch the fan on and off depending on the need for more or less cooling air to flow thru the radiator. The valve releases heavy silicone fluid, which locks the fan blades to the fan pulley. Special hubs for clutch integration Combined with our hubs specifically designed for the integration of clutches, mimimum installation depth can be kept without the typical added space requirement. Poor A/C performance at idle or low vehicle speeds. Turn key or jump the control system so that 90 -120 PSI air pressure is supplied to the clutch. Since you have an electric fan clutch, did you check to see if it’s getting a signal from the ECM? Fan Clutch test First, lets discuss what the fan clutch does and why it is there. The electromagnet controls a spring arm valve element which is deflected to a spring loaded position by the generated magnetic field so that viscous clutch operation is terminated. Learn more. Remove air supply. As the radiator heats up, the air passing through it also gets heated which heats up a small bi-metallic coil in the face of the fan clutch. 3. Check clutch plate for discoloration, blistered paint or other signs of overheating. be? A non-thermal clutch provides a steady flow of cooling air but is always engaged, so it offers lower fuel savings than a thermal-style fan clutch. Excessive fan noise at all speeds due to failed bearing. Fan clutch its self is fairly new but Im pretty sure thats not the problem. Heavy-Duty Thermal Fan Clutch: This fan style turns the fan at 70-90 percent of the shaft speed when engaged for increased cooling. NOTE To assure maximum horsepower carrying capacity of the Fan Clutch and to prevent damage to the Fan Clutch, there must be a minimum pressure of 90 to 120 PSI to the Fan Clutch upon engagement. The air clutch on the cooling fan will not engage until 210 deg F. on the gage. Using a bi-metal thermostatic coil they sense the engine bay temperature and engage or disengage the fan from the water pump shaft. Turn key or jump the control system so that 90 -120 PSI air pressure is supplied to the clutch. What is wrong with my car?? It should disengage and turn freely. The temperature is detected by a bimetallic sensor system or by an electronic control. Its a 2002 Oldsmobile bravada. This saves power, since the engine does not have to fully drive the fan. should always be taken at the Fan Clutch air inlet port. Standard thermostatic fan clutches will only be present on cars and trucks with rear-wheel drive. As temperatures increase, the clutch engages so that the fan is driven by engine power and moves air to cool the engine. Remove air supply. Any interruption of the air supply will cause the fan to run, keeping it in fail-safe mode. Air supplies of less than 90 psi (621 KPa) can cause the fan clutch to slip as it attempts to disengage the clutch. Check fittings and air lines for leaks or pinching. When the engine temperature drops to the cut-off point, the fan clutch solenoid valve vents air pres-sure, and the clutch disengages. Clutch On vehicles without a belt driven pulley, the water would be circulated either by a water pump driven by the timing belt, or by an electrical water pump. This allows the engine to operate more efficiently by removing the load that the fan places on it. We manufacture four different types of thermal fan clutches: standard duty, heavy duty, severe duty and truck fan drives. It’s made for fans with a lighter pitch. The fan clutch operation is regulated by a valve that is opened and closed by a thermostatic spring. A bi-metal thermal spring is located on the front of the fan that expands or contracts based on heat from the air passing through the radiator. The oft-overlooked fan clutch doesn’t get a ton of credit or attention, but it’s an essential piece of the cooling equation in many vehicles. fan clutches. This heats up a small bi-metallic coil in the face of the fan clutch, releasing an internal valve. The fan clutch is a device controlling the engagement of the EC fan. This saves power, since the engine does not have to fully drive the fan. Severe-Duty Thermal Fan Clutch: Severe duty thermal fans turn the fan at 80-90 percent of the shaft speed when engaged and 20-30 percent when disengaged. With engine stopped and clutch disengaged, check for air leaks at front of clutch and between the clutch and drive hub. I have a 1999 Mack Ch613 and my fan clutch wont stop. A thermal fan clutch reacts to temperature of the air rushing over it from the radiator. Conversely, at lower engine speeds, the fan will turn at lower speeds. Repeat. So I have a Nissan Frontier 2016 , we I start the truck the fans are normal then I turn the a/c on fans star working but then when I turnt the a/c the fans don’t stop so….? With engine stopped, and clutch disengaged, check for air leaks at front of clutch and between the clutch and drive hub. Are you saying that, if you grab a fin and try to spin the fan but it stops very nearly as soon as you let go of it, the clutch is bad? I replaced the heat senser located near the themostat. The line includes a replacement fan clutch for Kysor's K22RA; Major Kits, Seal Kits and Lining Kits for repairing Kysor rear- or front-air fan clutches; and five Hub Bearing Kits for Kysor's K22RA fan clutches. Verify clutch operation. Bimetal Clutches Air-sensing viscous clutches are ideal for a wide range of applications where quiet operation, excellent cooling performance, and cost efficiency are important. This style of fan clutch operates like a thermal clutch, but the ECM/PCM signal controls the level of engagement of the EV clutch. The fan clutch can be driven by a belt and pulley or directly by the engine when mounted on the engine’s crankshaft. Even though the air has been heated by passing through the radiator, it is still much less hot than the engine surface, so the airflow over the engine helps with cooling. This allows remote engagement and disengagement of the air pump. the water pump pulley) and will spin in between the radiator and the engine, drawing air back through the radiator and blowing it over the engine. Most do. This can be traced to leaks in the airline or air pressure that is sourced (drawn off) for other air operated accessories. Then you’re ready to go. At low and idling speeds, the clutch allows the fan blade to turn at almost a 1:1 ratio. When it rises above the preset level, a switch is closed, sending electrical current to the clutch coil. Some times driving down the road I hear it come on and off about 3-4times per Second, like if has a faulty relay or sensor. Viscous fan drive utilizing a bimetal precision sensor which modulates fan speed based on temperature of air through the cooling package. A valve inside the clutch regulates the flow of a special silicon oil. When disengaged, it turns the fan at 25-35 percent. L-22459-O-1293 CONTINUED ON OTHER SIDE o HORTON FAN CLUTCH WITH SYSTEM SENTRY ™ TROUBLESHOOTING GUIDE Why on earth would you continue to replace it after the first replacement didn’t change anything? The valve releases heavy silicone fluid, which locks the fan blades to the fan pulley. DM Advantage Two-Speed ® The DM Advantage alternates between eddy-current and spring-actuated cooling to moderate operating noise, increase available horsepower for auxiliary systems and minimize radiator abrasion. Incorrect air pressure to the fan clutch. On the Summit Racing website, for example, you’ll find three different types of thermal fan clutches from Hayden alone: Standard-Duty Thermal Fan Clutch: This design turns the fan at 60-70 percent of the water pump shaft speed when engaged, and 20-30 percent when disengaged. In this feature, we’ll explain how the Horton fan clutch works, what maintenance it requires and importantly what to keep an eye on . The Horton fan clutch has an important function in a truck’s operation, yet it is one of the most overlooked and least maintained components. Push the cardboard into the path of the fan, being careful not to put your fingers or any other body part in harm’s way. if it is set to minimum, the rear fan will not start since no heated air is needed to the cabin. With a thermal clutch fan if you remove the spring the fan will stay engaged ! The modern air conditioning compressor clutch is an integral part of a completely automated temperature control system. Air Problem 1. EMERGENCY OPERATION _____ 11 TROUBLESHOOTING _____ 12-13 TYPE 'S' & 'HT/S' EXPLODED VIEW _____ 14 ... H. Check for proper air pressure to the Fan Clutch. As temperatures increase, the clutch engages so that the fan is driven by engine power and moves air to cool the engine. Determine The Cause Of Previous Fan Clutch Failure Air leaks here can cause bearing failure Friction Disc Lining Replace Clutch when worn to 1/16" thick Emergency Operation Only! The fan clutch is a coupling device that is located between the water pump shaft and the fan. No change. Fan turns roughly or does not turn at all. This can be traced to leaks in the air line or air pressure that is sourced (drawn off) for other air operated accessories. Viscous Fan Clutch. The oil transmits the engine’s torque thus, rotating the fan. Air supply to clutch restricted. 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. What is the age of the water pump? See Section I. Viscous fan clutches are belt driven and found on many older rear-wheel-drive passenger cars. I use the manual switch to in gage the fan when I see the temperature rising. of air. I had to do that to a number of trucks to keep them running for the day R. I have a 95 Dodge ram van I replace the fan clutch because it felt like it was dragging wean it gat in normal temperature but now I replace it with a new one and now wean it get to normal temperature it’s dragging even worse than before second time I removed and replaced with a new one but no difference any idea? Replace Solenoid Valve. However, if engine temperature rises above the clutch's engagement temperature setting, the fan becomes fully engaged, thus drawing a higher volume of ambient air through the vehicle's radiator, which in turn serves to maintain or lower the engine coolant temperature to an acceptable level. Results. Learn how your comment data is processed. Fan spins excessively when engine is stopped (three or more times when hot engine is shut off). Do you think there could be another reason your engine is overheating? Electro-viscous fan clutch having an electromagnet carried by a rotatable pump plate within the confines of the clutch housing. Clutch The air pressure is vented to ENGAGE the fan. Clutch leaking. Fan clutch maintenance should be performed at every “A” PM schedule, at every oil drain or every 25,000 miles (40,225 km), whichever comes first. The thermal clutch responds based on temperature changes within the engine bay. This helps to make the rest of whatever system the unit goes into more efficient. When the engine is cool or even at normal operating temperature, the fan clutch partially disengages the engine's mechanically driven radiator cooling fan, generally located at the front of the water pump and driven by a belt and pulley connected to the engine's crankshaft. The air clutch on the cooling fan will not engage until 210 deg F. on the gage. Turn key or jump the control system so that 90-120 PSI air pressure is supplied to the clutch. When the engine is cool or even at normal operating temperature, the fan clutch partially disengages the engine's mechanically driven radiator cooling fan, generally located at the front of the water pump and driven by a belt and pulley connected to the engine's crankshaft. These fans are needed at slow speeds, typically below 35 mph and at idle. The fan clutch can be driven by a belt and pulley or directly by the engine when mounted on the engine’s crankshaft. But pneumatic clutches are just one example of what a few innovative twists can do to complicate (and improve) the process.. Thermal Fan Clutches, however, are the most efficient form of engine driven fans. Clutch fans are available via two operations: thermal and non-thermal. Incorrect air presssure to the fan clutch. If so what would be its location on the engine? The oil transmits the engine’s torque thus, rotating the fan. Remember, the operation of the fan is also dependent on the temperature setting, i.e. The modern air conditioning compressor clutch is an integral part of a completely automated temperature control system. Fan clutch maintenance should be performed at every “A” PM schedule, at every oil drain or every 25,000 miles (40,225 km), whichever comes first. 3. Verify clutch operation. Install two Grade 8 5/16-18 x I" bolts, tighten to 25 ft. Lbs. Your email address will not be published. Verify clutch operation. Here are some bad fan clutch symptoms you hopefully don’t experience. When it rises above the preset level, a switch is closed, sending electrical current to the clutch coil. 2. Like all components, fan clutches will wear out and need replaced. be? Air supplies of less than 90 psi (621 KPa) can cause the fan clutch to slip as it attempts to disengage the clutch. should always be taken at the Fan Clutch air inlet port. Is there another senser I should replace? It is a thermostatically controlled device that when operating normally will vary the fan speed independently of the engine speed. The temperature within the vehicle is thermostatically controlled. A valve inside the clutch regulates the flow of a special silicon oil. The speed at which a thermal fan clutch spins a fan depends largely on the exact fan you choose. Did you ever see an old hose collapse? These variables are manufacturer-specific and fan speed is dictated based on the level of cooling required. Clutch should lock up and be difficult to turn by hand. Wait for the engine to cool down to dead cold and start it up; most fans will turn some whenever the engine's running, but they shouldn't be running hard enough to hear from inside the car with the hood shut. 3. 3. A thermostat controls the solenoid operation. Front-wheel drive vehicles are equipped with a completely different cooling system due to the way the engine is configured. This is why electric engine-cooling fans are used virtually universally in front-wheel drive vehicles. The two terms "fan clutch" and "fan drive" are interchangeable. Fan Control Air Conditioner TimerSpecify the minimum amount of time the fan will run after activation due to Air Conditioner Pressure switch input. Most fan clutches are viscous or "fluid" couplings, combined with a bi-metallic sensory system similar to that in a thermostat. As hot air blows across the radiator, it heats a thermal spring mounted at the front of the clutch. 2. References. temperature. Air supplies of less than 90 psi (621 KPa) can cause the fan clutch to slip as it attempts to disengage the clutch. Fan speed does not increase until engine is excessively hot. in the engine block, the control valve directly senses coolant. See Section I. 2. As the radiator heats up, the air passing through it also heats up. Not at all relative to this site. STEEL CHASSIS #10 STEEL CHASSIS #16 GROUND FAN GROUND T E M P S W #18 #10 STEEL CHASSIS TO A/C COMPRESSOR FROM A/C THERMOSTAT RAD FAN SW RAD FAN SW AC CLUTCH SW AC CLUTCH SW TRINARY SWITCH (Installs on High Pressure refrigerant line) The radiator fan … This engages the clutch and drives the fan. They contain a drive and driven plate with annular grooves that fill with a thick viscous silicon fluid. At higher engine bay temperatures, a thermally activated fan clutch will activate, allowing the fan to rotate faster and pull more air through the radiator to provide maximum cooling. Required fields are marked *. the fan to run, keeping it in fail-safe mode. While many newer vehicles now use electric cooling fans to keep the engine cool, many older vehicles used a mechanical fan clutch to control the fans. Non-thermal clutches operate solely based on the shaft speed of the water pump. Most of these engagements are for air conditioning pressure, not coolant temperatures. This fan clutch requires 90-120 PSI air pressure to DISENGAGE (6.2-8.2 bar). Decouple. Two Speed. OPERATION. This parameter is required if the vehicle is equipped with an air conditioner pressure switch to control fan clutch engagement. The fan clutch is a cooling system component that controls the operation of the engine cooling fans. At high speeds, the silicone fluid within in the clutch will lose its ability to transfer the energy from the shaft to the fan clutch body (and therefore, the fan) and the fan is then allowed to almost free-wheel, removing its load from the engine. Each type is engineered to simulate the performance, fit The purpose of a fan clutch with a mounted fan is to help ensure that engines do not exceed certain operating temperatures, which are usually set by the manufacturer. The conversion of mechanical energy to electricity and back to mechanical rotary power with a fan motor is less efficient than a direct mechanical connection, but this is more than compensated by greater control of an electric fan through electronic thermostatic controls which can turn the fan completely off when the engine temperature is below the setpoint. At higher engine speeds, the clutch will rotate faster, causing the fan to rotate faster, pulling more air through the radiator. Please help me!! What are their ages? Clutch should disengage and turn freely.
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