AC compressor cycling
Cargo Master
Joined: Nov 2017
Posts: 3,110
Likes: 540
From: Rock Hill, SC
Hopefully you're not over on the oil. Especially if this is the first time the system has ever been opened. It would actually be wise at this point to check the rear strainer, and most likely flush the entire system, then add the proper amount of oil, and you're done with that.
Once you're all buttoned up, and your fully evacuated, charge the system with the standard Freon cylinder on a scale, or Dial-A Charge cylinder pre-filled with just more than your 4.4 pounds. Open both gauge handles till the charge consumes the vacuum, and equalizes , then close your high side manifold handle, and leave it closed, you're done opening that side of the manifold gauge set. Start the vehicle, and with the low side manifold handle left open allow the system to suck in the freon, (vapor only) not liquid till you reach the full required charge of the 4.4 Lbs. If the compressor does not to run when you start the vehicle with the small amount of freon it accepted from your state of vacuum, than as suggested above, you'll need to jumper the low pressure switch till you have enough freon in the system to keep the switch engaged. If the compressor short cycles as mentioned above, let it short cycle as it's slowly taking in more freon, and will eventually cycle normally.
Once you're all buttoned up, and your fully evacuated, charge the system with the standard Freon cylinder on a scale, or Dial-A Charge cylinder pre-filled with just more than your 4.4 pounds. Open both gauge handles till the charge consumes the vacuum, and equalizes , then close your high side manifold handle, and leave it closed, you're done opening that side of the manifold gauge set. Start the vehicle, and with the low side manifold handle left open allow the system to suck in the freon, (vapor only) not liquid till you reach the full required charge of the 4.4 Lbs. If the compressor does not to run when you start the vehicle with the small amount of freon it accepted from your state of vacuum, than as suggested above, you'll need to jumper the low pressure switch till you have enough freon in the system to keep the switch engaged. If the compressor short cycles as mentioned above, let it short cycle as it's slowly taking in more freon, and will eventually cycle normally.
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New User
Joined: Mar 2018
Posts: 20
Likes: 0
From: League City Texas
Hopefully you're not over on the oil. Especially if this is the first time the system has ever been opened. It would actually be wise at this point to check the rear strainer, and most likely flush the entire system, then add the proper amount of oil, and you're done with that.
Once you're all buttoned up, and your fully evacuated, charge the system with the standard Freon cylinder on a scale, or Dial-A Charge cylinder pre-filled with just more than your 4.4 pounds. Open both gauge handles till the charge consumes the vacuum, and equalizes , then close your high side manifold handle, and leave it closed, you're done opening that side of the manifold gauge set. Start the vehicle, and with the low side manifold handle left open allow the system to suck in the freon, (vapor only) not liquid till you reach the full required charge of the 4.4 Lbs. If the compressor does not to run when you start the vehicle with the small amount of freon it accepted from your state of vacuum, than as suggested above, you'll need to jumper the low pressure switch till you have enough freon in the system to keep the switch engaged. If the compressor short cycles as mentioned above, let it short cycle as it's slowly taking in more freon, and will eventually cycle normally.
Once you're all buttoned up, and your fully evacuated, charge the system with the standard Freon cylinder on a scale, or Dial-A Charge cylinder pre-filled with just more than your 4.4 pounds. Open both gauge handles till the charge consumes the vacuum, and equalizes , then close your high side manifold handle, and leave it closed, you're done opening that side of the manifold gauge set. Start the vehicle, and with the low side manifold handle left open allow the system to suck in the freon, (vapor only) not liquid till you reach the full required charge of the 4.4 Lbs. If the compressor does not to run when you start the vehicle with the small amount of freon it accepted from your state of vacuum, than as suggested above, you'll need to jumper the low pressure switch till you have enough freon in the system to keep the switch engaged. If the compressor short cycles as mentioned above, let it short cycle as it's slowly taking in more freon, and will eventually cycle normally.
Cargo Master
Joined: Nov 2017
Posts: 3,110
Likes: 540
From: Rock Hill, SC
It's either an inline, or in the TXV, if your rear was working properly, than you may want to pass on opening any of the rear parts.
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New User
Joined: Mar 2018
Posts: 20
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From: League City Texas
When I opened the system how can I tell if I need to replace the o-rings?
The new o-rings are the same diameter but appear a tad thinner. Will they swell after their installed?
Cargo Master
Joined: Nov 2017
Posts: 3,110
Likes: 540
From: Rock Hill, SC
No, they do not swell, if they're original O rings and you're opening the system for the first time, or for all areas that are being opened for the first time, than you really should replace the O rings that you disturb. I replaced my Condenser about 2 years ago, I can't remember but it must have come with new O rings as I know I didn't buy any. Most replacement components come with O rings, but aftermarket may not be up to spec. If that's the case check with your Ford dealer, for either individual rings, or a service kit if it exists.
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New User
Joined: Mar 2018
Posts: 20
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From: League City Texas
Amount of PAG oil
I have drained the new drier/accumulator.
I flushed the condenser.
Once i put the system back together, how much PAG oil should I add back to the system?
How much for the evaporator and which port do i pour it in high or low?
How much for the condenser?
How much for the drier/accumulator?
Before I removed the evaporator and drier and flushed the condenser, I replaced the compressor and drier and poured 14 oz of PAG into the system.
Is it better to be a bit lower than higher with the PAG oil quantity in the system?
Thank you for the advice in advance!
Happy Good Friday!
Cargo Master
Joined: Nov 2017
Posts: 3,110
Likes: 540
From: Rock Hill, SC
Attached is a good and quick read, the oil amount that Ford requires in the system is based on a completely dry system, or when new. With the exception of the hoses, feeding the rear, and the rear evap, you will probably be fine to follow the recommendations of that article. The oil migrates throughout the system with the oil and thus small amounts will end up in various system components. If you added the 14Oz, but never drained any part of the system, then you defiantly would have an issue. Be sure to rotate the compressor by hand before you start everything up, either rotation direction is fine, I often rotate once or twice when pulling a vacuum too.
PAG Oil For A/C Maintenance Helps To Avoid Compressor Failure
PAG Oil For A/C Maintenance Helps To Avoid Compressor Failure
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