A/C problem.... Help

[Big08f250]

Ok I drove my truck day before yesterday ac was perfect. I got in it yesterday and it will not get cold just blows hot air, the compressor kicks on and off every few seconds from what I have read it low of freon due to a leak some were. I was going to add some freon but I dont know on a diesel what the pressures are suppose to be?

[psd_va]

Yea most likely low charge but not sure what pressures are suppose to be off the top of my head right now. One thing you can do is if you have a black light or uv light of some sort you can shine it on the the a/c components and lines and see if you can find any dye showing up.

[Capt dong]

there are a lot of leak tester kits out there.

my ac system was doing the same and i added a can of freon and the manifold lowside gauge stabilized at 35 psi. i think the acceptable range is 35-45 psi.

i think both my vavles are leaking. none of the auto parts stores carry or rent out the valve remover that maintains pressure/freon inside the system. tools cost from 80-150 bucks. with the addition of system tester and more freon i might as well take it in and have it properly diagnosed and serviced. i think itll cost the same but i just dont the dealership or established a rapport with any of the local garages.