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</html>";s:4:"text";s:27630:"01 2001 Ford F150 Control Arm Kit Upper 5.4L 330Cu. If the clutch engages, the fuse or relay was at fault. Shut the engine off. Starter motor relay. After a few minutes, you may be able to build up enough pressure to close the low pressure switch. This module takes the place of 4 standard relays and eliminates unsightly wiring. for $39.99. Chris Stevenson has been writing since 1988. Connect the negative battery cable with the socket. Have an assistant turn on the AC controls to maximum. This fault indicates the clutch circuit is open or the wiring between the BHM and the AC compressor clutch is high resistance or open. Replace the fuse if the filament has melted or blown apart. Moisture reacts with the refrigerant and oil to cause acid and sludge that can destroy the system. Why buy Auto Parts from CPD? Charge the AC fully with the correct refrigerant. If your vehicle is an orifice tube system, the refrigerant gas will flow through one of the open compressor reed valves and into the condenser coil. The three components of a car’s air conditioning compressor clutch. If the clutch fails to engage, it means the clutch has an internal short. Do NOT hot wire the low pressure switch. Clean the contacts on both wire connector sides with electrical contact spray and a cotton swab. For the R134a type refrigerant, push the high-side gauge hose onto the quick release 16 mm nipple on the compressor. But chances are some of it will still reach the orifice tube and flow into the evaporator coil. Start the engine and let it warm up. This safety device was installed to prevent the driver from losing control of the vehicle. Raise the hood. Engine coolant blower motor relay 3. With 4 channels providing up to 200 Amps of momentary or 80 Amps constant combined … Special Offers. NEVER try to bypass the low pressure switch. If the fuse is good, pull the compressor clutch relay and check for power and ground on the relay control coil terminals in the socket. Eautorepair is a professional grade shop manual. Determine if your vehicle uses R12 or R134a refrigerant. AC compressor clutch — current below expected value The BHM measures the current on this circuit when the AC compressor is commanded ON. Touch the positive lead of a voltmeter to the positive battery terminal. No more than 1/4-inch of free-play should be allowed. This is … The high-side reading should fall between 200 and 225 PSI. Pull out the AC fuse and examine the filament inside the fuse. For the R12, hook up the low-side hose of an AC gauge to the low-side nipple on the compressor. If your air pressure is normal but the air is hot, you may have a compressor problem. If one or a few of these system components fails, cool air cannot be produced. Connect the high-side hose of the gauge to the high-side compressor nipple, which will be a 3/8-inch screw-on fitting. Engine coolant blower motor relay-high speed (except 2,4Turbo) R7. Transmission system relay. Listen for any internal buzzing or clicking from the clutch. Loosen the bottom AC compressor mount bolts and the top adjusting bolt with a socket. Air conditioning compressor and clutch assembly. Technician A says this noise may be caused by too narrow gap between the compressor's armature and rotor. Touch the negative lead of the voltmeter to the negative battery terminal. If the clutch doesn’t engage, the air conditioning compressor can’t pump refrigerant. You’ll find in-depth information, technical service bulletins, code definitions and step-by-step tests, and easy-to-understand wiring diagrams, along with descriptions of how the systems work. 12. R8. Turn the key to the RUN position and turn the blower fan to HI. R11. You may get it to accept a charge, but you may have already damaged the compressor. ... optional ac relay overrides temp switch and turns on fans when a/c is turned on adjustable fan switch/thermostat with radiator probe (12v switching, non-variable speed Shift the vehicle into neutral or park. This technician-invented, time and money saving tool cuts motor shafts in squirrel cage blowers and condenser fans … In order for the computer to provide ground, it must receive a good signal from the low pressure switch, high pressure switch, and evaporator temperature sensor. 4 independent channels can be activated using either power or ground. If you still get a low reading, the battery has a shorted cell and must be replaced. So try starting the engine and checking the compressor. a/c clutch. 14. It won’t be under pressure since the compressor isn’t running. They will just lead you astray. Both the pulley and the clutch should be spinning. Clean up your wiring with an MSD Solid State Relay Block. Have your assistant hold a jumper wire on the positive battery terminal while you touch the wire to the "hot" wire inside the wire connector (on the clutch side). Find the required Mercedes-Benz parts from our online catalog and place your order now. Charge the battery. We provide genuine Original Equipment Manufacturer (OEM), rebuilt, and new aftermarket components for domestic and imported passenger cars and trucks. DC current does not. In some vehicles the compressor clutch relay is turned on and off by the low pressure switch and the evaporator temperature sensor. Engage the emergency brake. Checking an A/C clutch relay is a process of eliminating possible connection failures. The clutch assembly accomplishes this using the clutch plate, flywheel, and pressure plate. I like the wiring diagrams in Eautorepair.net better than the hard-to-read factory diagrams on Alldatadiy. So start your diagnosis by determining if the compressor clutch works. While performing the checks, do not leave the relay … Magnetism attracts the hub and shaft to the pulley, allowing the clutch to turn the compressor. READSPREDSEAL - Readspeed Lambretta Red Seal AC Stator £75.00 Buy Now Details; READSPEEDSHOCKLAM - Readspeed Lambretta Rear Adjustable Shock Absorber £159.99 Buy Now Details; READSPEEDLUKASPROCDI - Readspeed Lukas Lambretta Pro CDI £85.00 Buy Now Details; RSL6PC - Lambretta Red Devil Six Plate Clutch Kit £299.99 Buy Now Details; RSSIPSC1 - LAMBRETTA … Wait for the AC clutch in front of the compressor body to engage and spin. Pull the plate off and look at the end of the shaft bearing seal on the clutch. When power energizes the clutch coil, the magnetic field pulls the clutch in to engage the compressor shaft. Swap it with another relay that has the same amperage and pin configuration. Engine control (EC)relay. If you have a situation where your car’s air conditioner compressor clutch doesn’t engage, try the troubleshooting techniques described here. Engine coolant blower motor relay- low speed. Connect the negative battery cable with the socket. Turn the voltmeter gauge scale to volts and read the number. Look for the AC relay in the fuse box. Checking the air conditioning clutch and compressor requires a few steps, gauges and hand tools. Horn relay. DIY recharging kits tell you to recharge through the low pressure port while the compressor is engaged. R2. Why go to a shop when YourMechanic offers over 500 services at the convenience of your home or office? Checking to see if the compressor clutch is engaging is a simple visual inspection. Wiring varies by make, model, and year. Connect the recharging kit to the low pressure (suction) port. The leak is large and should be repaired, because there’s probably air and moisture in the system. That’s because the clutch pulley is connected to a field coil which can be magnetized with electric current. It features industrial size electrical power and control components, typical of what students will find in the field. If you have an expansion valve system, the blower fan will prevent the sensing tube from shutting down the expansion valve while you try to add refrigerant. for $25.99, or a 4-Year (Best Value!) Then look at the front of the compressor clutch. If this technique doesn’t work, take it to a shop. With the blower fan running, any liquid that enters the evaporator will boil and turn back into a gas. Loosen and remove the three bolts that hold the circular faceplate to the outside of the clutch. Start the engine and turn the AC controls on maximum. His automotive vocation has spanned more than 35 years and he authored the auto repair manual "Auto Repair Shams and Scams" in 1990. Start the engine and have your assistant turn on the AC controls to maximum. Check them out! Who is correct? The air conditioning system on a vehicle has a number of components that work in concert with each other to deliver cool air to the passenger cabin. Clutch pulley wobble also indicates worn shaft bearings. Swap it with another relay that has the same amperage and pin configuration. Buy OEM Parts for Polaris, Side by Side, 2014, RANGER 570 EFI - R14RH57AA-AC-AR-6EAZ The clutch switch is attached to the pedal linkage and is activated by the clutch pedal arm when the clutch is pushed down. Car Parts Discount, Inc. is an industry leader among online discount auto parts stores. It’s important to note that air conditioning compressors need a constant supply of oil to prevent catastrophic failure. Then start adding refrigerant. Be warned that I take no responsibility for any damage you cause by using this technique. Forget about those cheap manuals you find at the auto parts store. Turn the air conditioning controls to MAX AC and start the engine. If you’re here, chances are you’ve tried to recharge your AC system and found a compressor clutch not engaging issue. There is a way to add more refrigerant without hot wiring the low pressure switch and running the compressor. Turn the AC to MAX to start the radiator fans. Buy Mercedes Benz parts online from Parts Geek at incredible prices. Start the engine and have your assistant turn on the AC controls to maximum. R6. Starter relay: F34: Micro relay : AC clutch relay: F35: Micro relay : Fuel pump relay: F36: Mini relay : Cabin Heater 3 relay (diesel) F38: Mini relay : Cabin Heater 2 relay (diesel) F39: Mini relay : HVAC blower relay: F40: Mini relay : ASD relay: Power Distribution Center 2008-2010. Cool air gets blown through the air conditioning vents in the passenger compartment. 11. If the fuse is good, pull the compressor clutch relay and check for power and ground on the relay control coil terminals in the socket. Push the low-side gauge hose onto the quick release 13 mm nipple on the compressor. Check the belt for the proper tension. Eautorepair.net is really Mitchell On Demand with a consumer style interface. New - The Shaft Blaster™ Motor Shaft Cutting Tool. At that point you’re running the compressor with little to no oil. The clutch drives the compressor, which sends refrigerant to the evaporator where refrigerant gets condensed. Move it away from moving parts so you can safely check for power and ground. But if the system is too low on refrigerant, the clutch will never engage. Technician B says a quick accurate test is to see if the clutch is the source is to switch on the air conditioning to see if the noise stops. However, I’m smart enough to know you probably won’t do that. And you need access to the latest technical service bulletins so you don’t waste time and money replacing parts that may misbehave due to a manufacturer’s software glitch. V8 GAS SOHC Naturally Aspirated Replacement PLEASE NOTE: 4WD ONLY; FOR VEHICLES WITH 2.5 INCH BOLT PATTERN IDLER ARM ONLY; (NOT FOR VEHICLES OVER 8,000 LBS GROSS VEHICLE WEIGHT) - XLT Crew Cab Pickup 4-Door AC current is used for the lights and then converted, by a rectifier, to DC current, to charge the Battery. R9 . Buy online, pick up in-store in 30 minutes. Look for the AC relay in the fuse box. Worn shaft bearings will build up resistance in the wiring and fail to turn on the clutch. Fuel pump relay. R5. 15. Some DIYers then hotwire the low pressure switch to force the compressor clutch to engage while they recharge. Car makers use an electro-magnetic clutch to engage and disengage the air conditioning compressor. Each channel is capable of handling 50 Amps for up to 8 seconds or 20 Amps of continuous current. The refrigerant travels though the lines and is cooled by the radiator. Get a 1-Month subscription (31 Days) for $16.99, 1-Year (Best Value!) In. AC compressor clutch relay. 13. R3. BAD MOVE. If it does not, shut the engine off and disconnect the negative battery cable with a socket. Stevenson holds a P.D.S Toyota certificate, ASE brake certification, Clean Air Act certification and a California smog license. Copyright 2021 Leaf Group Ltd. / Leaf Group Media, AA1 Car: Troubleshooting Air Conditioning, Stealth 316: Air Conditioning Troubleshooting Tips for Mitsubishi 3000GT/Dodge Stealth, Discount AC Parts: How to repair/Troubleshooting of an Auto AC Compressor, AA1 Car: How to Recharge Your Car's Air Conditioner. 10. Look at the reading. Place a mechanic's stethoscope probe on the top of the non-moving part of the clutch while the engine idles. Starter motor relay. In a computer controlled system, the compressor clutch relay is grounded by the computer. If it reads outside of these limits or shows no charge at all, the cutout relay inside the compressor is preventing voltage from activating the clutch. If the clutch engages, the fuse or relay was at fault. This AC/DC Electrical Learning System features a heavy-duty welded steel frame with built-in AC and DC power supplies, instrumentation, component mounting surface, and component storage panel. Plus, the DIY kit fitting will only attach to the low pressure port. In other vehicles the power flows through the air conditioning switch to the fuse and from the fuse through the low pressure and evaporator temperature sensor to the clutch coil. Stand in front of the AC compressor at the front of the engine. The belt should have no cracks or oil contamination that would cause it to slip. Battery current saving relay. Listen for excessive bearing noise coming from the clutch or compressor. Doing so will force the compressor to run with inadequate oil and can destroy the compressor. A rattling noise is heard when the engine is running and the air conditioning is off. Horn relay. You must replace the shaft seal and recharge the system. We offer il changes, brakes, filters, belts, sensors, scheduled maintenance, warning light diagnostics, pre-purchase used car inspections, and much more. Internal springs ensure that the assembly is engaged by default, meaning the pressure plates are pushing the other two components together, allowing the engine to transmit energy to the transmission. If the battery voltage reads below 12.5 volts, the compressor will not turn on. Pull the compressor against the belt to remove excess slack, then tighten the bottom and top compressor bolts. The air conditioning clutch relay transfers power, like a switch, from the interior A/C controls of an automobile to the A/C compressor, engaging the compressor clutch. AC voltage current (Polarity) reverses itself 120 times a second in a 60 cycle circuit (60 Hertz), give or take a time or two. R4. F1 (20A) ABS system. If the clutch fails to engage and spin, but you hear electrical buzzing or clicks inside, it indicates an internal clutch short. Locate the main fuse box. R10 . Disconnect the wire connector on the clutch with the engine off. The low pressure tubing is always a larger diameter than the high pressure line. Look under the hood at the AC compressor clutch. Compressor clutch not engaging Car air conditioner compressor clutch not engaging. If you see any oil residue, oil film or obvious leakage, it means the compressor shaft seal has failed and discharged refrigerant from the system. If the clutch doesn’t engage, the problem could be a blown fuse, an open in the wire to the clutch coil, a bad clutch coil, a poor ground, or a low pressure lockout. The radiator fans will cause the refrigerant to condense and turn back into a liquid. Ignition main circuits relay. Fuel lift pump relay – Diesel. If it slips, the pulley will not attain sufficient revolutions to engage the clutch mechanism. 9. Fun, Fun, Fun! You may find both DC and AC current used on the same machine. note: or in an ’84 to ‘89 240 you may use the a/c power ‘on’ wire: red/white wire at ac switch microswitch in dash. Have your assistant turn on the AC controls to maximum. The low-side reading should indicate between 25 and 40 pounds per square inch (PSI). Start the engine and turn the AC controls on maximum. Some car makers trigger the relay control coil ground through the PCM or ECM. If you’re not getting battery voltage, check the fuse. And, you’ll get all that at a price you can afford. AC compressor clutch relay. While the clutch pulley turns whenever the engine is on, the compressor only activates when AC (and in some cases defrost) is in use. If only the pulley is turning, there’s a problem somewhere in the system. That’s why car makers install a low pressure switch–to prevent the compressor from running if the system is low on refrigerant. Save on Dorman - Conduct-Tite 30 AMP 12 Volt 4 Pin Universal Relay 84601 at Advance Auto Parts. Open the high- and low-side knobs on the gauge. F2 (30A) ABS system. You need a professional shop manual to work on a late model vehicle. If so, try the troubleshooting techniques described here. At FCP Euro, we're proud to offer quality replacement car parts, a hand-curated catalog, an unbeatable Lifetime Parts Replacement Guarantee, all backed by one of the best customer service teams in the Automotive industry. With engine running and the AC set to MAX, use a digital voltmeter to check for battery voltage and good ground at the connector. Inspect the clutch pulley belt with the engine turned off. Heater/AC blower motor relay. The clutch switch is normally located underneath the dash, and prevents you from starting the vehicle to start while it is in gear. The low-side will have a 7/16-inch screw-on fitting. Disconnect the electrical connector from the clutch coil. 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