a/c problems

[Sirthor1881]

So I had a clutch failure on my a/c compressor. I replaced the compressor, orifice tube /In the hose, and the Accumulator. I held a vacuum on the system till 30 in hg. and left it on for about 45 mins to hour. I then charged the system. It has about 2, 12 ounce cans in it. I know it holds something around 1.6 lbs or so decal said.

I am having trouble with the system not cycling the clutch. I replaced the low pressure switch that mounts to the accumulator. Does the system use that switch and the high pressure switch to regulate the pressures? I have worked on many a/c systems on construction equipment, but they all used a capillary tube going to the a/c switch and the evaporator and that was what hepled to cycle the system off/on.

Maybe I don't have enough charge in the system? I don't think that it is able to pull all of the can into the system.

Any help would be appreciated.

Richard

 

[Sirthor1881]

Anyone have any ideas or guidance?

 

[simond]

Have you bleed it ?

 

[tjkj2002]

Your very undercharged.Those single cans are a very bad way to fill a AC system as you really have no idea how much is actually going into your system.Plus if the can states 12oz's you may actually only get 8-10oz's useasble.

Just have a shop do it,almost all are having super cheap specials now anyways.


Also did you add the correct amount of PAG oil? Very important when chaning all that stuff out.

 

[Sirthor1881]

Yes, when I filled it with PAG, I drained the old compressor measured and the new one. I put back in the amount oil that was removed from the old compressor. I added the amount listed that you(TJKJ2002) had listed in a previous post for the accumulator.

I put a good vacuum on it to 30 in Hg. and held it to that point for about 30-45 mins it was about an hour with the vac. pump.

I have never ran into an a/c system that will stay on and run if still undercharged. I guess it's just not low enough to kick the LP switch?

I will take it and have a recovery machine put on it and vac'd and recharged to spec.

 

[TnRebel]

Yes, when I filled it with PAG, I drained the old compressor measured and the new one. I put back in the amount oil that was removed from the old compressor. I added the amount listed that you(TJKJ2002) had listed in a previous post for the accumulator.

I put a good vacuum on it to 30 in Hg. and held it to that point for about 30-45 mins it was about an hour with the vac. pump.

I have never ran into an a/c system that will stay on and run if still undercharged. I guess it's just not low enough to kick the LP switch?

I will take it and have a recovery machine put on it and vac'd and recharged to spec.

did you shut the pump off and watched you vac. pressure to see if it held or you had a leak ?

 

[Sirthor1881]

Oh yeah definately....held right at 28-30 in Hg for about 25mins or so and didn't move.