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  #1  
Old 07-01-2011, 01:06 PM
webster426 webster426 is offline
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Default A/C Compressor issue

My compressor seems to randomly stop working. Electrically, everything checks out, blend door is operational, and fan is fully functional. For whatever reason, the A/C will work, then it will randomly turn off.

Any thing I can troubleshoot? I cannot imagine the compressor is going bad if it it working fine most of the time. Thanks in advance.....
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Old 07-01-2011, 01:53 PM
spoons896 spoons896 is offline
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Default Re: A/C Compressor issue

Check the low pressure switch it on top on the dryer, you can check it by jumping round the plug, if it work after doing that ether u are low on R134 or the switch is bad. you might look around here there are a TON of threads about this issues and it seems most of the time it was the low pressure switch or the high pressure switch.
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Old 07-01-2011, 04:10 PM
webster426 webster426 is offline
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Default Re: A/C Compressor issue

Is there any picks related to this issue? I have no idea where the high and low switches are located.

I am completely confused because my research shows that the compressor will turn off occasionally if it is low on freon. I guess that is possible but it will run fine for like 10 minutes, then jsut randomly shut off, then randomly turn on. It does not seem to matter how fast (or slow) I am traveling, not does it matter how hot (or cold) the components/vehicle are. If it was low on freon, wouldn't it be shutting off more frequently?
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Old 07-01-2011, 04:47 PM
djfllmn djfllmn is offline
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Default Re: A/C Compressor issue

if the system is low on freon the compressor will cycle constantly...and there is a switch/sensor im not sure which it is...but it should be on the one line going into the condensor or in that general area
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Old 07-01-2011, 04:55 PM
webster426 webster426 is offline
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Default Re: A/C Compressor issue

OK so I bridged the high low switch and the compressor pulley did NOT spin. I heard then engine kick up the RPM's, but no luck with A/C. It is the wierdest thing because I just let it run for like 20 minutes and the A/C worked great the entire time. I drove it a block, it shut off, I jumped the switches, still no A/C.

Does this sound like a low freon issue? Shouldn't the compressor turn on when I jumped the switches? Shouldn't the low freon cause the A/C to be warm even when the compressor is operational? When it works, the A/C is nice and cold, the problem is the thing only runs when it wants too.....
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Old 07-01-2011, 09:56 PM
webster426 webster426 is offline
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Default Re: A/C Compressor issue

Ideas......?
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Old 07-02-2011, 04:00 AM
Tito Tito is offline
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Default Re: A/C Compressor issue

I'm sure it's low on freon. My 1990 ranger ac wasn't working. I bought a small can of freon and turned on the ac full blast loaded the freon into low ac port and viola! Started turning but then after a few min stopped and again engaged. So I went out and bought another can filled her up and now runs perfectly. Same thing happened with my ford expedition would run then stop and engage and stop within minutes. Went out bought a big can of freon and now runs all time. Hope it helps
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Old 07-02-2011, 11:12 AM
webster426 webster426 is offline
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Default Re: A/C Compressor issue

Sweet...I will top her off today and see what happens. Just was a little nervous about the bridged high/low switch not turning the compressor on. I will top it off and let you know how it turns out.....thanks!
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Old 07-02-2011, 04:24 PM
webster426 webster426 is offline
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Default Re: A/C Compressor issue

OK....I bought the nice 18oz R134a can with guage. The low pressure initially read at 28 PSI with the ambient temperature outside just over 100 degrees. The system SHOULD have charged to somewhere between 50-55 PSI. That never happened, the can is empty and it is still reading around 30 PSI. I know it is a low pressure system, but shouldnt I have been able to spot a leak? Hear a hissing? Something? Everything seemed fine. Once again, the A/C was kicking out cold air, I drive it around the block and the damn compressor wont turn on. I drive it home, let it sit for like 30 minutes, fire it up, and the compressor is on, A/C kicking. As I had previously stated, the A/C WILL still work when the vehicle is driving. It was running fine doing about 50mph on the highway. There seems to be no reason why the compressor keeps turning itself off and on. There has never been an ice issue on any of the components.

PLEASE help.....as stated, the ambient temp is over 100 degrees! Thanks....
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Old 07-02-2011, 09:27 PM
webster426 webster426 is offline
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Default Re: A/C Compressor issue

I guess I am gonna have to take her to the shop and get raped =/
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  #11  
Old 07-03-2011, 01:03 AM
Tito Tito is offline
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Default Re: A/C Compressor issue

Hmmm. Sounds wierd...is there a possibility the ac clutch isn't working properly and that's why it's engaging and disengaging? Also have u checked the fuse?
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  #12  
Old 07-03-2011, 10:07 AM
webster426 webster426 is offline
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Default Re: A/C Compressor issue

Both the fuse and relays are good. I do not know how to check the clutch, but the compressor will stay on during initial start up until the vehicle is moved. Just to reiterate, the A/C will work when the vehicle is in motion, but it will shut off after only driving like 100-200 yards. It will kick back on when the vehicle is in motion, but at various speeds and RPMs. My local auto shop does not rent or sell sniffers, or dye kits =(
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Old 07-03-2011, 08:01 PM
north44 north44 is offline
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Default Re: A/C Compressor issue

Ford A/C compressor clutches are noted for going south.

Intermittent operation of your A/C and the symptons you describe seem to indicate that your compressor clutch is failing.

If I recall correctly, they're fairly simple to remove and install, but not necessarily easy, because you may need a puller - any decent garage should be able to do it easily.

If the rest of the system is ok (compressor not seized, no leaks in the hoses/system, correct amount of refrigerant, etc.) then you won't even have to evacuate the system and all that other stuff.

May be best to take it to an accredited A/C facility and get a professional opinion - it's hard to diagnose without seeing/hearing/otherwise sensing (in person) what it's doing.

Good luck on your diagnosis.
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Old 07-04-2011, 08:41 AM
webster426 webster426 is offline
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Default Re: A/C Compressor issue

Thanks for all your help guys. I think I am going to have to take it into the shop. The vehicle was ran for 30 minutes on city/highway driving and the A/C performed flawlessly. On the way home, it began working intermitently again. I am very against taking any of my vehicles to a mechanic, but I do not see any other choice. I'll will update when I get the truck back (probably wont be for a couple of weeks cause I will be out of town).
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  #15  
Old 11-05-2012, 08:44 PM
NewShockerGuy NewShockerGuy is offline
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Arrow Re: A/C Compressor issue

Any update on this? I know it's old but looking to see what has happened or how easy it is to replace the ac clutch would be good to know.

Mine is doing the same thing.. worked fine and now nothing. I am going to bridge the switch and see what happens...

-Nigel
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