Ford Super Duty (1999-2016) :: Air Conditioning Won't Turn Off - Clutch Disengage
May 16, 2014
I have verified that my AC clutch does disengage (and re-engage), but it seems like the AC is on all the time. Normally you don't notice this in the Northwest because I always overpower it with the heater, but now that it's above 70 on occasion, in vent and full cold, it still blows 20 degrees colder or more than outside air temp.
Is it possible that the clutch disengages but that the bearings are bad and its somehow still turning the compressor? Would a mechanic be able to diagnose this or would I just have to throw money at buying a new compressor? My first indication should have been that I get about 15-16mpg when I used to get 18+ occasionally.
View 14 Replies
Advertisement
I have a 2001 F550 flatbed tow truck with a 7.3 and the ZF 6 trans. i put a Luk clutch flywheel pressure plate new throw out bearing new clutch fork New clutch slave cylinder and master set up. When i push the clutch in it is VERY EASY compared to the way it was before. Ane when you push the clutch in and put it in gear you can hear the clutch disc rubbing on the flywheel and if you lift your foot the thickness of a hair the truck takes off. Also i can't engage my PTO because the clutch is not disengaging all the way. there is No adjustments on this set up. What Now.
View 2 Replies
I've got a 2000 F250, 5.4L 4x4 with the ZF5 5-speed transmission. Three years ago I replaced the complete clutch assembly, pressure plate, throw-out bearing, etc, and had the flywheel re-machined. Put it back in and all has been well. Only has about 15k miles on it. Earlier this week I went to drive it and all of the sudden it started getting harder to shift and by the end of the trip the clutch will not disengage at all when I push the pedal in.
Furthermore the pedal is much harder to push than it always has been. Checked the reservoir and it's fine. After some searching it seems to most likely be an issue with the master and/or slave cylinder either needing to be bled or replaced. Further reading revealed that bleeding and recommends just replacing the whole system, so I've priced that out. Was it a master/slave issue? Anything else I should check in case it isn't?
View 2 Replies
2011 F250 - AC works perfect sometimes. When it does not there is not clutch action or signal. Pressure is good, will work for many hours when working. Sometimes it will not turn on at all. I'm looking at installing a resistor in the evap temp sensor circuit.
View 6 Replies
I've read many posts about ESOF and fault vacuum lines and how that will prevent 4x4 from engaging. I experienced a different problem this past weekend. Here's the situation...
Was about 1.5hr drive up to the mountains. Outside temp when we left the house: 10F. Outside temp when we arrived at destination: 9F. Quite a bit of road grime on the way up from sand, slush, and that magnesium chloride (or whatever they hell they put on the roads in an attempt to keep it from freezing). 4x4 worked fine on the way up. 4x4 light on dash was on, and I KNOW I could not have climbed the snow-covered forest roads without being in 4x4. Also, I could hear and feel the front hubs turning.
On the way home, once I got to where the roads were sufficiently ice free, I turned the dial on the dash back to 2WD. 4x4 light goes out. But I can hear and feel the front hubs are still turning. Toggled the switch back and forth a few times. 4x4 light would come and go with the toggled switch. But the hubs didn't disengage.
When I got back into town (outside temp now about 5), we stopped at a red light and I toggled the switch again. This time, the hubs disengaged. Is this a sign of bad vacuum? Or more an indication of faulty hubs??
View 7 Replies
For about a week or now i have been trying to track down a sound from my truck, i had another post up and was finally with jhl3 able to determine that the sound is coming from my transfer case. The other thread with video of sound is located here : [URL] .... I've got a little bit of time to mess with i now
Quick rundown, began hearing odd sounds about a week ago, determined that it is transfer case. Front hubs are unlocked, esof switch is set to 2wd. Can not turn front drive shaft. I just put some zip ties on front drive shaft and went for a short spin, determined front drive shaft IS turning. Hubs are not locked and 4x4 is not engaged, did the sharp slow turn test, no feel of pull from front end.
Im not quite sure where to go from here, going to check connections at tcase motor and some relays.
View 14 Replies
2003 F250 SC Lariat. 4x4, 6spd manual transmission, Manual hubs and manual 4wd shift. The truck shifts into 4wd perfectly. When I shift back into 2wd the transfer case stays in 4wd. If I back up it will go into 2wd.
View 7 Replies
2002 F350 Super Duty 7.3 Diesel.Transmission trouble. Came off interstate - took foot off throttle at yield and hit gas as turn was clear. Did it fast and felt like hit wall. Immediately lost transmission engagement. Trans did not reengage until below 20 MPH. Tried to speed up and disengaged at 20 to 25MPH - just free wheel - engine wine. Went to 1st gear and would come up normally. Shift to 2nd and could get up to 30MPH and probably higher - didn't push. Shift to drive and trans disengage. No trans fluid leakage and level looks good and clean. What to look for? 126K miles.
View 1 Replies
I have a 2005 f350 with the power stroke I went through the hole vacuum system all new hubs, seals, vacuum actuator and fixed it all now I'm having the reverse problems everyone has my hubs are locked all the time as soon as I plug in the vacuum actuator the transfer case is still in 2wd and will switch 4x4 and work and disengage but the hubs are always in unless I unplug the actuator ...
View 6 Replies
We have a 2000 F250 7.3L Diesel. A few years ago we switched out the auto hubs for manual Warn hubs. We've had no problems with 4x4 since that time, until now!! The 4x4 Hi light is on and the transfer case is engaged. Since the hubs are manual we have them unlocked, however we can't get the 4x4 to disengage. At one point, tried changing to low and it hesitated but finally went in to 4 Lo, then we had a hard time getting it out of 4Lo and back to 4 Hi. Here's what we've tried--checked fuses, checked and replaced relays, checked wiring connection at the transfer case. Husband used volt meter to test power at transfer case wiring connector--showed 0.5 volt of power with the key on. No change in reading. Checked power at relay--about 14.5 volts there. Took truck to repair shop but their computer could not communicate with the GEM.
View 7 Replies
So I got in my truck yesterday and i started it like normal and turned air on. The air will not blow out of the vents but only the defrost vents. I have checked all vacuum lines and good, my 4x4 engages and no issue with it locking in. I am Puzzled on what it could be?
View 3 Replies
I have a 1998 C class RV with the dash Air Conditioning that is shorted out, it keeps on blowing the 15A fuse when turned on to Norm A/C or Max A/C or Mix or Defrost settings on dash only.
For troubleshooting I have disconnected the engine Air Conditioning Compressor plug to verify that it isn't the fault.
I've removed & replaced the switch that controls the dash a/c to defrost settings and worked for a minute, but now continues to blow the fuse as before. I'm not ready to buy another switch for now.
Is there a common item that may contribute to fail or common wiring that I should look at. I purchased the full electrical and service manuals but haven't dived into the ohm checks of the wiring, wire by wire yet. Tight wiring areas under the dash.
Also the fan speed controller works when in VENT or FLR modes, so I don't believe that is the problem, also temperature vacuum controls work.
View 12 Replies
My 1999 F 250 5.4 liter. I know I have a vacuum leak because whenever I accelerate the air conditioning coming from the vents switches to the defroster. So my question is how do I go about finding the leak? My hubs in the front are manual so I know I don't have lines going up there. I do have some mechanical capabilities I've changed water pumps alternators brakes etc. But never anything with vacuum lines or a/c.
View 14 Replies
I was driving to work this morning and my hydraulic clutch linkage messed up on the 1999 f-250 super duty 7.3 with zf 6 speed. It acted like any clutch master cylinder when they go out, the pedal went to the floor and the clutch would not release, but it also became very hard to shove in the clutch pedal, so I speed shifted it without the clutch and made it to work. So I figured no big deal I will swap out the clutch master and slave cylinder complete assembly in the parking lot, except I had to get a ride 30 miles to an auto parts store that had it in stock. I changed out the complete assembly and same problem with the new one, extremely hard clutch pedal, so I did not dare to push it anymore and risk damaging the new cylinders, and left the truck at work. I am thinking broken throw out bearing jammed into the clutch, or dislocated throw out arm causing the problem. The clutch disc, pressure plate and single mass flywheel were replaced by the previous owner 3 years and 15,000 miles ago.
View 3 Replies
Ok AC wasn't working took it to a mechanic told me the the compressor was missing a clutch he recommended i put a new compressor. Is it possible just to put a new clutch in it and if so do i have to remove the compressor to put the clutch on it.
View 14 Replies
I've got a 2000 F350 PSD XLT. When I turn on the AC it runs and cools fine. However, the first time the clutch cycles off or you select another position then back to an AC position the clutch will not reengage. The high and low pressure check good. How to trouble shoot this.
View 14 Replies
2003 V10.. Can I replace the AC compressor clutch with out pulling the compressor out?
View 13 Replies
I have a 2000 F-550 w/7.3. I am having a bit of a problem with the hvac system. When I turn the selector switch to floor heat only or put it on vent or both the a/c clutch kicks on and off. Not when I put it on defrost but as I said only when it is in the other positions. I do know that the clutch will kick in and out when on the defrost position. That is fine. But why would it kick in and out when in the heat only position?
View 2 Replies
I was thinking my AC clutch has too much gap and was gonna do the "fix it" listed in another thread. However, my clutch wouldn't engage like it states needs to be done. The only time my AC blows cold is when it's cold/cooler outside OR I rev up the RPM's but it hardly stays engaged. I had a friend do a few diagnostics on it, with a paper clip (assuming he did it right) he feels my clutch is bad. But I've read the clutch is either good or bad, works or doesn't work, no in between.
Next, it doesn't seem to blow as hard as it used to. I replaced the blower motor last summer, but even before that, it seemed to not blow very hard. If I have it on low, it's very hard to feel it. With a crew cab and 2 little boys seated in the back, they often end up sweaty and miserable, no matter how far we go. I've read the orifice tube might need to be replaced, or something needs to be cleaned cuz it's dirty or clogged like the orifice tube. But I can't remember what.
View 2 Replies
I Have a 1999 f250 7.3 diesel with the zf5 manual transmission and to shift gears I need to push the clutch all the way to the floor. Could this possibly be the slave and master cylinder or is it the clutch?
View 14 Replies
2002 - f250... I originally posted this issue in July of '03. Nothing has changed.
1. At max ac, regardless of how hot it is, the ac clutch cycles due to low pressure once the cabin temp reaches about 78 degrees. This is not acceptable or expected in my opinion.
2. I have run extensive tests, done this for years, and the conclusion is that there is too much pressure drop in the evaporator. I'm seeing 5-7 psi drop measured using a Fluke digital temp probe, insulating the probe tip around the pipe. Compare outlet of orifice tube several as far away from orifice as possible and comparing to outlet temp of evaporator where it comes out of the plastic shrowd. Convert temp to pressure.
I've seen many posts over the years of people not happy with '99 to '04 ford truck ac operation at cruising speed. I have confirmed that the compressor is cycling way too much to cool the cab down. I even ran an experiment where I completely blocked the condensor to raise the head pressure and the compressor still cycked at 1500 rpm's with the cab above 75 degrees on a 90+ degree day.
My next step is to blow out the evaporator and see how much oil and junk I get out of it. I'm also considering taking the evaporator out and trimming the rubber gasket that is around it. It is blocking about an inch of the coil face all the way around.
My conclusion still is that the evaporator just isn't loading up enough as if it's partially clogged. There is only about 2 psi drop between the outlet of the evaporator and the compressor.
The compressor cuts out at 21 psi so the low pressure cutout switch is working properly.
What should I use to flush the evaporator out? Will mineral spirits do it as long as I blow it out real well and make sure I get all of it out? Also wondering if I should blow out the condensor thinking maybe there is something clogging it up.
In spite of some folks on this forum saying it is normal for the compressor to cycle at cruising speed, that is a correct statement depending on many factors. In my case, the cycling is not normal or expected. I have also tried:
1. VOV
2. Larger orifice
3. 14 oz charge over what the sticker says
View 14 Replies
