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Old 10-15-2007, 10:09 PM   #1
andrave
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Tried to recharge my AC system-its at 120psi on the low pressure side, what next?

I tried to recharge the AC system on my vitara cause it quit working back in the spring. I got a kit with a gauge that says to hook it up to the low pressure line where it goes into the firewall. the gauge went all the way up into the red (like 120 or above) and the instruction manual with the recharge kit says "for pressures above 40 psi consults a professional technician."

so obviously I couldn't recharge it. I thought it would be low pressure (leaking?) and I might have to find a leak. Now I find out its high pressure and I have no clue what to do. advice?
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Old 10-15-2007, 10:26 PM   #2
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well if its already 120psi. in the system then its obviously charged. Next u need to make sure that ur a/c compressor is coming on.. then make sure your condenser fan is working.. after that its time to take it to a tech

wrong forum?
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Old 10-15-2007, 10:40 PM   #3
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well, mark is right... but your vehicle should also have an over-charged switch, so the compressor won't turn on when it gets too high a pressure. Usually it should be 20-40 psi on the low side running, depending on ambient temp and humidity. With car off you should see close to 100 psi on both sides.

Once again, without the proper pressures the a/c may not attempt to turn on the compressor. If you can see the compressor on, and the pressures continue to climb, as mark said, check the electric fan up front. It should turn on when not moving and will cause that pressure to go up to a dangerous level before the compressor is cut off.

Again, pressure is critical, even a quarter pound, as little as it seems, makes a big difference in the efficiency of the system.

Mark and I are at BMW, but i'd recommend Ellis any day.... Good people and they'll serve you right...
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Old 10-15-2007, 10:47 PM   #4
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when you're a/c is not working....it doesn't mean your freon was low. it could be 1 of many problems. to tell you the truth, you might've made the situation worse by overcharging the system.

i'd definately get it checked out....Ellis performance are good people, they have free rental cars also
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Old 10-15-2007, 10:58 PM   #5
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the car and AC have to be running, AC on max and doors open to be sure it does not shut off, MAKE sure the compressor is on when you check and freon
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Old 10-15-2007, 11:45 PM   #6
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freon has to be just right too low and the a/c won't cool to high and it won't cool. I wouild evacuate the system and start over. should be be between 30-40 on the low side and the high side goes up depending on how hot it is outside. I've seen the high side as high as 195-200 when it is dog days of summer. when you pull vaccuum I usually leave it under vacuum for 30 min.
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Old 10-16-2007, 05:49 AM   #7
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your low side will never get below 30psi in this climate. high side should never go above 350psi. if your low side is high on pressure then you have either over charged the system, your condenser is not condensing, or your reed valves on the compressor are no good.
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Old 10-16-2007, 08:06 AM   #8
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Quote:
Originally Posted by andrave View Post
I tried to recharge the AC system on my vitara cause it quit working back in the spring. I got a kit with a gauge that says to hook it up to the low pressure line where it goes into the firewall. the gauge went all the way up into the red (like 120 or above) and the instruction manual with the recharge kit says "for pressures above 40 psi consults a professional technician."

so obviously I couldn't recharge it. I thought it would be low pressure (leaking?) and I might have to find a leak. Now I find out its high pressure and I have no clue what to do. advice?
we can help just give us a call
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Old 10-16-2007, 08:08 AM   #9
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we can help just give us a call
Yes they can, they fixed my AC and it's a frickin' blizzard in 95 degree weather.
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Old 10-16-2007, 08:21 PM   #10
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Quote:
Originally Posted by LoneStar954r View Post
well if its already 120psi. in the system then its obviously charged. Next u need to make sure that ur a/c compressor is coming on.. then make sure your condenser fan is working.. after that its time to take it to a tech

wrong forum?
did u pulled vaccum before?
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Old 10-16-2007, 08:30 PM   #11
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Quote:
Originally Posted by maskale View Post
the car and AC have to be running, AC on max and doors open to be sure it does not shut off, MAKE sure the compressor is on when you check and freon

+1

Just read about t last night. I don't need the work done, I just read stuf like that. Anyway, do what he said.
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Old 10-16-2007, 10:38 PM   #12
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Actually, efficiency of system can diliburate different pressures on the system. We have cars like the x5, as big as it is, has less then 1 lb of freon in the system and regularly goes to 20 psi due to its efficiency... Just thought I'd add that....
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Old 10-17-2007, 04:27 AM   #13
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Quote:
Originally Posted by Caligonetx View Post
Actually, efficiency of system can diliburate different pressures on the system. We have cars like the x5, as big as it is, has less then 1 lb of freon in the system and regularly goes to 20 psi due to its efficiency... Just thought I'd add that....
pressure is not relative to volume. A Tractor can hold anywhere between 2-6lbs of the same type of freon and the pressures will still be the same if working correctly. it can all be compressed to the same psi. Like you said the efficiency of the compressor and condenser is what is going to decide how low the psi gets and how cold it will be. Lower pressure is colder higher pressure is hotter. That would be cool to see some vehicles get down in the 30-40's with that low of pressure. I just have never heard of it down here with the heat and hummidity.
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Old 11-06-2007, 02:09 AM   #14
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screw it I just moved someplace where its 44 degrees. and the heat works fine.
so I'm good till at least may or so.
lol
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Old 11-06-2007, 02:12 AM   #15
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Quote:
Originally Posted by andrave View Post
screw it I just moved someplace where its 44 degrees. and the heat works fine.
so I'm good till at least may or so.
lol
hahaha. nice. that's what i would do.
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Old 11-06-2007, 10:46 AM   #16
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Quote:
Originally Posted by marlboroman71818 View Post
pressure is not relative to volume. A Tractor can hold anywhere between 2-6lbs of the same type of freon and the pressures will still be the same if working correctly. it can all be compressed to the same psi. Like you said the efficiency of the compressor and condenser is what is going to decide how low the psi gets and how cold it will be. Lower pressure is colder higher pressure is hotter. That would be cool to see some vehicles get down in the 30-40's with that low of pressure. I just have never heard of it down here with the heat and hummidity.
ya. our new two door 3 series(not for 4 door) the E92/3 runs even lower in pressure. I've seen a properly working system just below 30 psi on the low side. I say proper cause we're starting to get alot of problems with a/c leaks on the new two doors... so we need to know what the pressures should be at and not just a low-freon system. But that's job security for us. If they can't build them, we get paid
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