my a/c is not working so i thought i had a leak so i hooked up my a/c manifold gauges to add a can or two to get me going till i have the time to track down the leak but the system is charged? the fuses are all good wiring looks good i tried to jump the pressure switch still no luck? i hooked up my HP tuners and was able to kick the compressor on, it would go on for around 5 to 10 seconds then turn off (HP tunes dont run stuff long just long enough to check function) when the a/c clutch was kicking on the a/c was getting cold

so wheres the problem?

fuses, wiring, relay, a/c clutch is working, jumping the pressure switch didnt kick it on so i'm guessing thats good

the light for the a/c button is lighting up but can it be the a/c controller? any thing else to check before i swap it out?

 

Is there enough freon in it?

That's the only thing I can think of that would make the clutch act up, outside of a switch or something.

If there isn't enough freon in it, it'll do what you described, spin a few seconds and then cut off.

 

There are 2 pressure switches, a low pressure one on the accumulator, and a high pressure one on the line from the compressor to the condenser.

 

gotcha! i didnt see the lower one in the line from the condenser till i read you post and checked, i'll try jumping that one see what happens

the a/c manifold gauges show enough pressure so it should kick on

 

just tried to jump the pressure switch in the condenser line nothing happens

i swapped to electric fans ran by the pcm would that have something to do with it?

 

If your truck has a pressure sensor on the high pressure line then the fans can be controlled by AC system pressure. If not, they can only be controlled by AC clutch engagement. I believe only the electronic TB trucks have the pressure sensor, although it can be added to the cable TB trucks with enough effort. This doesnt really help you, just background info.

 

ok i just wasn't sure if the pcm has to be programed for the a/c since i swapped to the electric fans

at this point the only time i can get it to kick on is with the HP tuners so i'm leaning on the a/c control panel

if it was do to low pressure when i jumped the pressure switch the a/c clutch should of engaged i dont know of any thing else it can be?

 

This gots me stumped ��

I replaced the control panel no help, system has freon, jumped the sensor on the dryer no help, swapped relay nothing, fuses are good, HPTuners I can kick the clutch on and get cold air

The lower sensor is 3 wires what's the correct way to jump it to test the system?

 

Perhaps these will help

 

thanks atomic but i'm not really good at reading those