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Old 09-26-2010, 06:55 PM   #1
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Default Air Conditioner recharge?

So I think my A/C is not as cold as it should be, and it is still 85-90 degrees. Could someone please tell me where on the truck i can check the coolant level? and if it is low, how can i recharge it? thanks
(1994, 4.9L , E4OD, 2wd, reg cab)
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Old 09-26-2010, 07:13 PM   #2
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coolant level is in the radiator...called Anti-freeze....

Freon level is in the AC system...there is no indicator other than pressure...

you want just enough to keep the clutch engaged at 2500rpm...and maybe a tad more...too much and it wont transfer heat
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Old 09-26-2010, 07:18 PM   #3
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yeah i know the coolant is rad, i meant freon

but what happens is that it will get good and cold, but then the temp will rise as if someone moved the ****, and then eventually get cold again.
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Old 09-26-2010, 07:35 PM   #4
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listen for the compressor cycling...I put a light in dash on mine so I can see when the pressure switch trips...I fill it just until it doesnt cycle any more
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Old 09-27-2010, 05:19 PM   #5
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Like the previous post mentioned, the level indicator are the hi-side and low-side pressure readings which are dependent on refrigerant level, and outside and cab ambient temperatures. The Ford service manual has pressure temperature graphs for this.

If you don't have a manufold gauge set and an A/C vacuum pump do not drain the system. Draining the system will allow air and with it moisture to enter the system. Empty systems need to be evacuated with a vacuum pump at as close to 30" vacuum the vacuum pump will do for about 30 minutes time. Usually at 29.7", since known equipment to man has reached 30" vacuum. Then when recharging, the refill ammount is measured.

The system is likely low if your A/C compressor clutch cycles with your A/C controls set to normal and fan on high blow at idle. Full systems almost never cycle at idle with these settings.

I have seen but never used kits from the auto parts store that have refrigerant and a short hose that connects to the low-side pressure port. If you have no A/C tools you can try one of these kits and add refrigerant until the compressor stops cycling at idle, then add little more. Follow the instructions because depending on how close to the compressor the low-side port is you can damage a compressor by liquid charging as opposed to the slower but safer vapor charging.
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Old 09-27-2010, 08:17 PM   #6
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^^ i'll try that tomorrow if its warmer, and then see what happens. as for the auto store kits, ive never used them, and id say you get what you pay for as far a quality.
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Old 09-27-2010, 10:05 PM   #7
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Ive used the recharge kits with no problems at all. Not on my truck, but other peoples vehicles.
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Old 07-11-2012, 09:52 AM   #8
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Default 2000 f 150 4.6 ac oil??

I had a new compressor installed last year for $ 700 rip-off dollars. I still have no ac cause the jerk didnt fix the leak. I bought new hoses, accumulator and orafice tube. I dont know how much oil to add. I was thinking of removing the compressor and draining it so I can start fresh. Truck calls for 9 oz of oil. Does this all go into the compressor? Another question is, do I vacuum before adding the oil? If not wont the vac suck out the oil? One last thing, truck calls for 42oz r134. they dont sell a 42oz can so how do I know when I have the correct amout? Is there a pressure # to go by?
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Old 07-11-2012, 06:11 PM   #9
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A/C is a closed system if it isnt up to par take it to a professional and have them check it. they will have a gauge that they can hook up to both sides and the manuals with the specs to compare to. they should then want to put dye in the system to find the leak. this way they know what needs to be fixed.

to rronnie166 sounds like with all that your replacing you are going to need to bring the system back to a vacuum to rid the system of air first. i would try to find a reputable shop to do it. it sucks that so many rip off shops are out there. i was told the reason why the compressor usually needs replaced when a/c work is done.but i cant remember what it was. though i do remember it usually needs replaced when other a/c work done and hardly ever by itself.

so for everyone else if a shop says you only need the compressor go get a second opinion. it should be- well you need a compressor and then we can get the system up and running to find the leaks. A/C's can be a pain and i have seen entire systems need to be replaced. hope for the best and prepare for the worst.
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Old 07-11-2012, 06:11 PM
 
 
 
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