Air Conditioning Questions??? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 13 (permalink) Old 03-30-2008, 02:17 AM Thread Starter
 
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Air Conditioning Questions???

It's getting close to A/C time here in CA and mine has never worked. I hadn't really checked it out to see why until today. I knew that my condenser was very dented up, so I examined it really close and found a couple of the inner tubes (not fins) actually split open. Normally I wouldn't work on the A/C myself, but since it appears to be completely empty on 134a, I figured I would replace the condenser myself.

My questions are: Since the A/C has not been ran for a while, what other things should I inspect? I have heard that o-rings like to dry up. Is there a good lube to use on them or just replace them? I wil probably have the system charged by a shop once I replace the condenser. I guess any other leaks will show up then. I may have them dye test it as well. Any other thoughts or suggestions. :thanks:
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post #2 of 13 (permalink) Old 03-30-2008, 02:27 AM
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PAG oil is what R-134 systems use. If there hasn't been any refrigerant in the system, then I would take the lines off and at least inspect the o-rings. There should be 1 at every connection. You can get the oil at almost any auto parts store. What you need to do is rent a vacuum pump (usually 15-30 bucks for a day) designed for AC systems, and draw the system under vacuum 12 psi, and then add the refridgerant. This will get all of the air out of it and let the AC system work to its fullest potential.
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post #3 of 13 (permalink) Old 03-30-2008, 02:35 AM
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You might also want to check the condition of the A/C compressor clutch. Try and move the clutch by hand, if it moves and doesn't feel like it has bad bearings then it should be ok. If it is stuck or feels like the bearings are going out (you will know when you turn the clutch) then I would replace the compressor before you have it charged.

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post #4 of 13 (permalink) Old 03-30-2008, 03:09 AM
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You're probably going to need to replace the dryer. They're not very much, but they're full of desecant which attracts moisture, and if you have a hole in the condenser than its probably drawn moisture and isn't any good.
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post #5 of 13 (permalink) Old 03-30-2008, 06:57 AM Thread Starter
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Is the "dryer" the same thing as the dehydrator or accumulator? I.e. the cylinder shaped unit near the heater box/blower?
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post #6 of 13 (permalink) Old 03-30-2008, 04:37 PM
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Quote:
Originally Posted by bluovaltruk01
PAG oil is what R-134 systems use. If there hasn't been any refrigerant in the system, then I would take the lines off and at least inspect the o-rings. There should be 1 at every connection. You can get the oil at almost any auto parts store. What you need to do is rent a vacuum pump (usually 15-30 bucks for a day) designed for AC systems, and draw the system under vacuum 12 psi, and then add the refridgerant. This will get all of the air out of it and let the AC system work to its fullest potential.
I never thought of renting a vacuum system very good idea i have thought of making my own but never renting one.
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post #7 of 13 (permalink) Old 03-30-2008, 04:46 PM
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i would just replace it, take it to your mechanic and tell him what you did, unless he has no idea whathes doing, hes going to pull a vaccum on it a let it sit for a few mins to make sure theres no leaks, this will also pull out all your moisture. then charge it up, let it run for a while then pull it all back out, and take the orphice out check it clean it and refill it and be on your way.

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post #8 of 13 (permalink) Old 03-30-2008, 06:23 PM
 
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Quote:
Originally Posted by 99fordtruckguy
Is the "dryer" the same thing as the dehydrator or accumulator? I.e. the cylinder shaped unit near the heater box/blower?
Yes it is.
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post #9 of 13 (permalink) Old 03-31-2008, 02:17 AM
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Yes you should replace the reciever dryer/ accumulator. There is an orifice tube in the small metal line near the dryer. You should remove it and check for contaminants. Looking at it will tell a good AC guy how much oil to add to the system to bring it back to the proper amount. A new Otube is $3.

Truck calls for Pag #46 oil. I would replace all the O-Rings at every connection now too.
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post #10 of 13 (permalink) Old 03-31-2008, 02:32 AM Thread Starter
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Are the o rings a Ford item only, or can I get them from another source? About how many o rings are there in the AC system?
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