A/C probs
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A/C probs
i replaced A/C components, such as accumulator, compressor, and the orifice tube and had other comps. cleaned and blown out...97 4.6L
i began to recharge the system and charged up to about 50 psi on high pressure side and it seemed to stop recharging...if i have the hose off of the low pressure line, it will blow the freon out like it should when i have it hooked to the accumulator, but it ended up stoppin charging into the low pressure side...is there air in the system and cant charge anymore? or what is the problem and why is it not recharging anymore bcuz i still have quite a bit of freon to put in it so that the compressor will start turning
i began to recharge the system and charged up to about 50 psi on high pressure side and it seemed to stop recharging...if i have the hose off of the low pressure line, it will blow the freon out like it should when i have it hooked to the accumulator, but it ended up stoppin charging into the low pressure side...is there air in the system and cant charge anymore? or what is the problem and why is it not recharging anymore bcuz i still have quite a bit of freon to put in it so that the compressor will start turning
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From: Louisville,Ky.
You must vacuum down the system before charging it. You want it down to 29.92" vacuum for at least an hour before charging.
Once you have properly vacuumed the system, recharge it thru the low side with the system running. Add the oil charge first, then the freon.
Once you have properly vacuumed the system, recharge it thru the low side with the system running. Add the oil charge first, then the freon.
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ok, where can i get the vacuum tool for pretty cheap and how much pressure does it take before the compressor kicks in? and the vacuum, do you use it like charging the system, or do i have to disconnect lines and such??
oh and the compressor already is pre-oiled with 1.5oz, the sticker under the hood says max of 7oz of oil, how much should i put in it??
oh and the compressor already is pre-oiled with 1.5oz, the sticker under the hood says max of 7oz of oil, how much should i put in it??
Last edited by Chris 97 F150; Jun 10, 2008 at 12:29 PM. Reason: addition
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From: Louisville, Kentucky
When the vacuum is pulled on the system, the oil, freon and any air will be pulled out by the vacuum pump. This is why you need to put oil back in before the freoan is added. By the way, you don't want to put too much freon in the system either as this can cause pressures to be too high and will result in other problems. Doing this job at home in the driveway under the shade tree can be done if you have the knowledge and the proper equipment. It doesn't sound much like you have either. You may want to get a qualified technicain to do this for you. Good luck! 
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yes i did use guages...and also vacuumed it down somewhere between 1 and 2 hours...but found the real problem, no voltage to the switch...checked with voltmeter at the plug and gettin no voltage
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is there a relay or fuse under the hood that controls power to the compressor, because the fuse in the fuse panel inside the truck is good...no voltage to the plug going to compressor and i have jumped both low and high pressure switches with wire
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Guys the vacuum pump doesn't remove any oil. It removes the "non-condensables" in the system (ie.air). You need to put the pump on and read the vacuum in microns not inches of mercury. The proper tools are unaffordable for the average DIYer. You are always best to take it somewhere to get it done by a pro. This is coming from a A/C expert.
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From: Louisville, Kentucky
Originally Posted by KingRanchMan02
When the vacuum is pulled on the system, the oil, freon and any air will be pulled out by the vacuum pump. This is why you need to put oil back in before the freoan is added.
I am no expert in automotive AC obviously, with a statment like that. I know enough to get around and when to get assistance.
There is oil in the compressor, the dryer, the evaporator core and the condenser core. Each of these should have a certain amount according the the manual, which varies per component.
Originally Posted by NEBFRD
The proper tools are unaffordable for the average DIYer. You are always best to take it somewhere to get it done by a pro. This is coming from a A/C expert.
I whole heartedly agree with this statement.
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I, the DIYer, have fixed the problem, i have knowledge on what to do and how to do it A/C expert, just a broke wire that my lazy *** didnt want to search the whole wiring harness for...A/C running very well like brand new, and very cold i might add 
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