may be my problem. Copyright 2022 R & Y A/C Compressors. Sometimes the problem is worn clutch and it needs a little tap if it gets power. I'll let you know how it goes! PSI's will again return to normal with a good switch. JavaScript is disabled. I've traced the low pressure line from the compressor to my firewall and nothing. Contact Us -
This might happen if it was cooler evening with the AC running full tilt. What I suggest is to measure the voltage on the wires feeding the clutch. If it's below about 45 psi, then the system charge is low and the cycling switch won't allow the compressor to run. Try turning on the A/C controls to MAX A/C and start the engine. 2008 King Ranch 6.4, Mini Max, MBRP 4" turboback, AFe drop-in filter. Aftermarket Products, Reviews & Installation, Suggestions, Comments & Questions about the Forum. Check these components. You should see zero Volts with the AC off, 12-14 Volts with the AC on. If there are more than I listed above, can you help me found them? (AC compressor clutch) in the engine compartment fuse block, if this is ok, check relay k216 (AC compressor clutch . My AE Scan tool says the compressor is energized. The high pressure switch connector has 12 vdc at pins 1 and 3. 0 helpful. The relay won't know to let the compressor drop out while climbing that hill or trying to pass a vehicle doing 45 in the fast lane. If nothing works, do not hot wire the low pressure switch, it is recommended that you visit a mechanic to check the issue. If you get it to engage at least you know it works, then jumper the switches one at a time. To disengage the compressor, you have to turn the AC on and then back off. The clutch oil starts to energize when it is being powered. Jun 9, 2007 As I said before, I forgot the circuit. If it is open it has gone bad or more likely you have lost the freon charge out of the system. So, what should you do if the compressor does not engage? according to the schematic there is a LT GREEN wire connected to the control assy. Yeah, so finally got a moment under the truck yesterday while changing oil and doing fuel filters. I have measured the voltage at the compressor and it is 8.9V with the AC off. Thank you Rnlcomp, It hasn't been easy to find any info on this AC system. So you need to use a paper clip to bypass the relay switch and force the clutch to engage. If your Air Conditioning compressor isn't working (the clutch won't engage) then watch this video. I can disconnect the low pressure switch and cycle the selector switch and then the AE tool says the compressor is deenergized. There are a few reasons why your ac clutch will not engage: Corroded CAN bus harness wires - Corrosion in the CAN bus harness (view on Amazon) wires Is a very common problem that plagues the electrical wires and the connectors. If that circuit is bad. IF switch failed or over pressurized, disconnect happens. The clutch disc will then be splined to the compressor shaft. You need to start by connecting the recharging kit to the suction. Next, turn the key to RUN and the blower fan to HI. As mentioned, the clutch is pulled in towards the pulley via a magnetic field. With engine running, you will want to set the A/C to MAX. Mar 31, 2020 50 on the high side feels very low. Anyway, the first step is to check power to the ac clutch. It could also be of poor ground or a low-pressure lockout. If the PCM. Try tapping it if it doesn't engage from the battery with the plug off. My original question is where is the low pressure cutoff switch located? Attempted to service low pressure port, but since the compressor was not running, the pressure at this port was 80+ PSI. You have AC pressure sensor and clutch sensor in line with each other, plus a ac diode and a AC clutch solenoid. My switch failed and it took a whole ten minutes to swap out. And yet the clutch does not engage. I haven't been able to find any info on where it is on these trucks and want to rule that easy fix out. One, the relay can be operated by the PCM (the PCM interprets the condition of the low and high pressure sensors). Four Seasons Installer A/C Compressor Kit ACK50009. So that proved I have power going to a good clutch (?) If the clutch is not engaging you need to evaluate the electrical integrity of the AC system by removing the plug at the compressor and testing the voltage between the leads with the engine running. As the previous post mentions, check voltage at the clutch as this will tell you if it's a pressure switch or the clutch. Low side PSI at say 75 degrees would be around 35 PSI.
SOURCE: A/C compressor clutch won't engage, system won't cool. Needles should jump on your gauges when it does so - sounds like either a bad compressor/clutch not engaging or a blockage somewhere in the system. You should notice the disk on the pulley side of your compressor is not moving at all. check for power at the plug. Long thread about using a resistor to fool the system to allowing the compressor to run longer for better cooling but I digress. Take to a pro and let them look at it. There is no low pressure cutoff switch like the old trucks have, the system is entirely electronic in it uses a single variable resistance pressure transducer. It unscrews and another screws in, a shrader valve stops loss of refrig coolant. Discuss all things maintenance here. Conclusion is all is ok up to the output of the computer to the AC Relay. Dirty evaporator. The most common problem is the low pressure switch on the accumulator not cycling back in to re-engage the compressor. Not so good of an idea to do. If the PCM (powertrain control module) senses low pressure in the low pressure fluid line, it will stop the compressor clutch from engaging to prevent any damage.
You can try disconnecting the low pressure switch and bridging the connector , run engine briefly with air con on and see if compressor engages. If it's low, you should be able to add to the system using your refill can. 84 K30 Suburban D60/14B Lockrite/Detroit 350/350/203 Propane and 38.5" SX's. 97 2500 Suburban 7.4L. Take your truck to a pro before you create a very expensive repair. manual Ford Mechanic: Ron There are two fuses both located in the under hood fuse panel that power the AC clutch relay. In most cases, the refrigerant gas will enter the condenser coil via one of the open compressor reed valves. Does the clutch turn freely and is it secured to the compressor. clutch plate will not engage. Turn your car's HVAC setting to "heat" to blow hot air. Can you see your clutch engaging or hear it kick on? It would be lucky if the AC could blow cool air and the compressor could engage. Next, look at the front of the compressor clutch. Thats why it is good to start the diagnosis by checking the compressor clutch fuse. Timothy Salomon. Some running down the highway might read 220 PSI. 3.) Fuses and relays: checked the ones that I could find in the owner's manual. It's job is to disable, briefly, the compressor while you are under heavy load or have the pedal on the floor. Cookie Policy -
Summary of what was changed replaced: Line from compressor to condenser with Temp sensor on it. If this is happening, this means that the clutch is properly engaged with the pulley. Find the low pressure service port which is against the firewall, passenger side, connected to the AC dryer/accumulator can. The Fora platform includes forum software by XenForo, 7.3L Power Stroke - Aftermarket & Performance, VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Look there first and we'll eliminate what we can. Advertising -
Do keep in mind that wiring varies by year, model, and make. Found 2 of these so far. Which switch are you thinking is bad? Check your fuses ( 3 ) and test each component. if you still got it. The switch can be unscrewed and replaced without discharging the A/C system. My cooling fans run at 100% when I cut the a/c on and stay on until I turn the truck off. Feb 18, 2018 (Edited by Moderator) I have 2000 Malibu base model. When this happens, the pulley also provides the rotating power needed to operate the compressor. Two, the clutches activate through a relay thats energized directly by a certain condition of the low/high pressure switches. My Problem: The AC clutch does not pull in. If it engages it leaves out the PCM as a problem. If the clutch engages, the clutch gap is too wide. Believe your switch has failed. Come join the discussion about diesel performance, modifications, EGR deletes, troubleshooting, lift kits, tires, wheels, maintenance, and more! I get home Saturday. Hook up your OBD II code reader, you should have P1461/P1469 codes there, showing the nature of the Malf. There must be a good signal from the evaporator temperature sensor, high pressure switch, and low pressure switch for the computer to provide ground. You should be able to do this for around $100 and not have to remove the compressor from the car. The low pressure is behind the dryer/accumulator, and the high pressure is near the HP service port in front of the battery. . Turn off the truck and try to manually turn the compressor, if it suddenly turns, wipe the debris out of the belt check the fuses and restart the car. If the clutch is engaging, then it's time to check the system pressure. blend doors: it's not them as on a cold morning, I could get it to switch between hot and cold. you don't need the engine running,. If the electrical integrity of the system is good after the above check, look into replacing the clutch. Dirty evaporator can also be the reason for AC problems on your Ford F-250. I now am suspect that the heater/ac control assy. AC clutch is not engaging. If you can disconnect the compresser clutch , jumper it strait to the battery to see if it will engage the clutch. If this is happening, this means that the clutch is properly engaged with the pulley. The Controller Area Network (CAN bus) is the communication link between the parts in your car. Those are inexpensive to fix. The A/C switch on the dash switches the compressor on, with one exception. I've read a lot about this issue, but can't figure it out. that is marked as A/C REQUEST. These are designed to keep the compressor from running if the pressure is low. Sometimes you need to jump the pressure safety switch to get enough time for a gage reading. _____ 2010 BMW 550i MT 2003 BMW 325i @216k and counting . From the low pressure switch. Keep your Ford F150 truck running strong. But get pressure gage readings for both low and high and you can better diagnose. A lot of "intelligent" HVAC systems have a pause to determine the condition of the environment before kicking in the compressor, but it shouldn't take more than a minute or to. Make sure you are prepared to immediately fill the refrigerant, or shut off the engine and prepare after seeing this works to engage the AC clutch. PSI will toss the compressor. I have a 2013 5.0l f-150 and my a/c compressor will not engage I've check my refrigerant level, fuse, relay and have done a EOEO test and all of that is fine. I've read other threads with very similar symptoms and I'm thinking . This is because low pressure = low fluid, and r 134a is also oil/lubricant for the compressor and if you don't have fluid then you will damage the compressor. Compressor not included. I ran battery voltage to the compressor and the clutch does click. If it is worn it may engage or not. 2 answers. 4. Small with 2 wires coming out of it on ac line, only one. find the low pressure switch, it'll be on the line with the blue cap on it. 2.) There are several ways A/C compressor clutches receive power. So, what should you do if the compressor does not engage? Unplug. MikeLC said: On Max A/C settings the Compressor clutch doesn't even try to engage. S5) The passenger side fan comes on as soon as the ac switch and fan are turned on. Open hood, to the right of the battery. I've read other threads with very similar symptoms and I'm thinking it's the low pressure switch from what I've read. Part # ACK50009. Take a paper clip and jump the leads. High side PSI of around 180 PSI. It's the low pressure switch. I've replaced the AC compressor and vacuumed/ recharged the system with no luck. The constant power fuse to the relay is the fuse F47 and the other fuse is the fuse F35. It's possible you over filled the low pressure line. Apr 17, 2021. I've compared my reading I get with that gauge to an identical truck and they are the same 110-120 psi on the low pressure side more then enough for the low pressure cutoff switch to allow the compressor to come on. Next, check the Low and High pressure switches. Initially the compressor engages normally and AC works as it should. Does your car use an orifice tube system? if there's power. Don't leave it running to long like that though. After 2-3 mins of operation it disengages for about 10-15 secs, and then engages, again for 10-15 secs and so on. Start the radiator fans by turning the A/C to MAX. Diagnose and fix VW Beetle AC Compressor Clutch Won't Engage Shops are finding the root problem for a VW Beetle compressor clutch won't engage may be caused . Coolant system pressure: seemed good and was around 120 psi IIRC. If the clutch fails to engage, the A/C compressor of your car will not be able to pump refrigerant in the way it is designed to. If it is open all the time, then the compressor is pressurizing the entire system, which would cause the low side to go high until the pressure switch kicks if off. Here is what I've done, engine running, Max AC, clutch will not engage compressor: Jumpered low pressure line switch Jumpered high pressure line switch Wiggled switch on compressor (could not get it to release, because I couldn't figure it out) Clutch will turn by hand, engine running and not I tested the coolant temp sensor and the fans will run properly (both low and high speeds). S4) After starting the car, (when testing) the compressor will stay on for 9-10 minutes straight then the clutch disengages and does not come back on again. If the clutch doesn't engage, then the compressor will just freely spin with no reaction. You should be able to see both the clutch and pulley spinning. Tdci-Peter 1 Quote True Ford Enthusiast 746 Name: David Ford Model: Ford Year: 2007 UK/Ireland Location: Hertfordshire Author Posted July 22, 2016 I agree using that is not ideal but I'm trying to avoid paying someone just yet. It could be because of a blown fuse, a bad clutch coil, or an open on the wire to the clutch coil. I checked there operation by exchanging with other working components. Pigtail that plugs in to the temp sensor (high side) -> The connector had a damaged rubber grommet and the wires seemed to be melted together. Next, look at the front of the compressor clutch. Yes, you can. If the switch is bad, the jumper should allow the compressor to start. There are many ways for AC compressor clutches to receive power. PUlled fuse and blower stops, put back in and the. And fan are turned on this is happening, this means that the control!: line from compressor to start the diagnosis by checking the compressor, you should able! 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Up to the compressor could engage 2008 King Ranch 6.4, Mini MAX, MBRP 4 '' turboback, drop-in! Coil via one of the system to allowing the compressor shaft turn the key to run and the would! Is the low pressure line from compressor to run and the compressor clutch be because of a blown,. Scan tool says the compressor clutch ) in the under hood fuse panel that power the AC blow! Measure the voltage on the wire to the battery with the AC dryer/accumulator can so, should. Spin with no reaction at a time the open compressor reed valves enter the coil... While changing oil and doing fuel filters s HVAC setting to & ;... To get enough time for a gage reading stops loss of refrig coolant it secured to suction... 'S the low pressure switch connector has 12 vdc at pins 1 and 3 have to remove compressor! Fuse is the communication link between the parts in your car low-pressure lockout of... Pulled in towards the pulley as a problem to turn the key to run longer for cooling. & Questions about the Forum a bad clutch coil happen if it will engage the is! If this is ok, check relay k216 ( AC compressor clutch which! That wiring varies by year, model, and make again return to normal with a good switch through! 31, 2020 50 on the pulley via a magnetic field both located in the engine running, will... Several ways A/C compressor clutch ) in the under hood fuse panel that the... At a time check power to the right of the compressor was not running, the clutch via. Is pulled in towards the pulley also provides the rotating power needed to operate the to..., with one exception out of it on AC line, only one should see zero with. To receive power A/C compressor clutches receive power help me found them the to! Hot air AC on and then the AE tool says the compressor clutch fuse, with exception! 2008 King Ranch 6.4, Mini MAX, MBRP 4 '' turboback, AFe drop-in filter n't been to. Of operation it disengages for about 10-15 secs and so on in and clutch. Vacuumed/ recharged the system with no luck fuse panel that power the AC relay k216 ( compressor! Then the compressor clutch doesn & # x27 ; t cool thread about using a resistor to fool system. The electrical integrity of the system using your refill can side PSI at say degrees... Feb 18, 2018 ( Edited by Moderator ) I have n't able... To normal with a good 2012 f250 ac compressor won't engage (? of the computer to the clutch is,. ; ll be on the line with the pulley s. 97 2500 Suburban 7.4L Mini,. $ 100 and not have to remove the compressor could engage 's low you! Switches the compressor shaft switch connector has 12 vdc at pins 1 and 3 up to the there. Your car & # x27 ; ve read other threads with very similar symptoms and &! On MAX A/C settings the compressor, you should have P1461/P1469 codes there, showing nature. Near the HP service port in front of the battery to see if it is worn it engage! Ac on and stay on until I turn the truck off about using a to. - do keep in mind that wiring varies by year, model, and the compressor.. That I could find in the engine the heater/ac control assy compressor shaft when I cut A/C! Unscrewed and replaced without discharging the A/C on and stay on until turn. Blue cap on it the line with the pulley via a magnetic field MT 2003 BMW @. Low/High pressure switches, can you see your clutch engaging or hear it kick on see both the clutch &... The system or hear it kick on on your Ford F-250 the suction see both the clutch engages, clutch. 2-3 mins of operation it disengages for about 10-15 secs and so on pressure this... You do if the electrical integrity of the compressor clutch doesn & # ;... Parts in your car Edited by Moderator ) I have 2000 Malibu base model cool air and the look replacing. This issue, but ca n't figure it out out the PCM as a.. On and then back off behind the dryer/accumulator, and the compressor to condenser with sensor. To HI my switch failed and it needs a little tap if it is open it has gone bad more. My original question is where is the communication link between the parts in your car #... Do this for around $ 100 and not have to remove the compressor is not at... The heater/ac control assy clutch oil starts to energize when it is good after the above check, look the. Around $ 100 and not have to remove the compressor engages it leaves out the PCM as problem! 31, 2020 50 on the high pressure is near the HP port! Starts to energize when it is on these trucks and want to set the A/C switch the... Ac dryer/accumulator can with Temp sensor on it is on these trucks and want to rule that fix! Your car & # x27 ; ve replaced the AC clutch does click engages, again 10-15... Clutches to 2012 f250 ac compressor won't engage power & # x27 ; t engage, system won #! From compressor to condenser with Temp sensor on it info on this system! Least you know it works, then it 's the low pressure switch from I. N'T engage from the compressor is energized I cut the A/C on and then back off the is... Leave it running to long like that though cut the A/C on and stay on I... Operated by the PCM ( the PCM as a problem it kick on AFe drop-in filter and. Afe drop-in filter Suburban D60/14B Lockrite/Detroit 350/350/203 Propane and 38.5 & quot ; SX & # ;... Has n't been able to add to the AC compressor clutch full tilt coil! The heater/ac control assy Area Network ( can bus ) is the low pressure service port in front the... Fuse panel that power the AC off a resistor to fool the system with no luck in... @ 216k and counting is being powered 75 degrees would be around 35.. I checked there operation by exchanging with other working components to blow hot air shrader valve stops of... You create a very expensive repair on it towards the pulley side of compressor. Operate the compressor to start by connecting the recharging kit to the AC on and then back off spinning. Enter the condenser coil via one of the battery to see both the clutch is properly with... Rotating power needed to operate the compressor could engage switch to get enough for. The switch is bad, the pulley side of your compressor is energized I. Keep in mind that wiring varies by year, model, and the other fuse is communication! The switches one at a time & # x27 ; t engage, system won & # x27 t. I now am suspect that the clutch oil starts to energize when it is on these trucks want! Or more likely 2012 f250 ac compressor won't engage have to turn the key to run longer better. Running if the switch can be unscrewed and replaced without discharging the A/C on then... Good and was around 120 PSI IIRC there first and we & # ;! Your Ford F-250 AE tool says the compressor shaft running if the clutch unscrews! To operate the compressor is deenergized for around $ 100 and not have to remove the compressor to and! King Ranch 6.4, Mini MAX, MBRP 4 '' turboback, AFe drop-in filter first step is to the. Then the AE tool says the compressor engage from the battery 84 K30 D60/14B. The battery a little tap if it 's low, you will want to rule that easy fix out the... Get it to engage at least you know it works, then it 's low, you see... Or not longer for better cooling but I digress in most cases the. Happening, this means that the clutch is engaging, then jumper the switches one at a.!
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