Need help with AC fix.

Need more information. Truck year and model. Does it have APADS? What engine?

 

If it's new then let Volvo fix it

 

Well, does the control come on in the truck. meaning the lights on the dash when you push the little a/c button??

For you, you might have a pressure switch or the control panel might be bad.

Even though you had the system vacuum/charged, did you have a leak down test performed??? Takes at least 1 hour..

 

If there was any kind of leak, it has to be more than vac'd out. You have to flush and replace the oil. In a humid environment the oil can only be exposed for about 15 minutes. Otherwise it will pick up moisture and the AC will never work for more than a few minutes. The P.O.E. oil bonds molecularly to the oil, and can not be removed by vacuuming the system down. P.O.E. oil has Carbolic Acid (Soap) as a component. You can tell if you have P.O.E. oil if your system has the 134R Refrigerant in it, then it has P.O.E. oil in it. You also have to change the dryer.
Hope this helps,
Bill

 

Probably the trinary switch on the firewall on top of the air dryer. That's one of the devices that kicks the AC on and off. It just may be lose. They are a pain to get on. Turn your AC on and push down on the connection. Usually a rubber boot over the wires.

 

Funny, My A/C compressor comes on when the switch is turned on and the blower is turned on,but, i get hot air and the compress spins and doesn't cycle. I think there is refrigerant in the system. Both high side and low side lines are warm to the touch. Earlier outside temp were... Oh... about 100Degrees / 38c. Just a little warm in the truck.

 

Hey Skateboard, got a pic of that trinary switch??? Is that the one against the firewall with the pigtail hanging out next to the air filter??? The one you have to vacuum the system in order to replace??? Why can't these things be easy...

Also, it that considered the pressure switch???


Lol..