Anyone have this problem before

Dont know much on Volvos. If it's free while off and isn't usually that way, probably solenoid went bad. Or mechanic messed with it and got the lines backwards. Drain all the air from your tanks. Still free? Then your fan clutch is bad. If it grabs, then look at the solenoid and lines.

 

Sounds like you burned the fan clutch up from running low on air. With low air pressure, the clutch drags. Your truck should have a valve that doesn't allow air to the fan clutch until 80-90 psi, 60 is too low. Anything below 80 PSI and you're risking the fan clutch dragging, at 60-70, it's definitely not fully releasing it and burning up the clutch.

Unplug the air line going to the fan. If there is no air pressure at the fan hub, it should be locked. If it still spins free, you have a bad fan hub. If the fan hub is working, post back and we can walk you through checking the fan solenoid.

 

With out the fan clutch pulling air while stopped, your A/C pressure and temperature probably spiked. I don’t know much on Volvo, but some truck systems have a over pressure switch that shuts off the A\C in events like that. This switch could be stuck or a computer is holding it off. Hopefully you didn’t burn anything else up. When you get your fan clutch fixed, Your A/C will work just fine or it won’t. But you won’t know till then...

 

A couple things that come to mind.

First off you should never ever drive with the air getting below 80 psi with a leak. That puts you and everyone else in danger with reduced air pressure on the brakes.

Second is this, while a few are right about how it works, the air fan is controlled by the ECM and the A/C is controlled by the Body computer. I won't get into detail of what does what but if you have air up to the solenoid, and NO A/C, chances are the Body computer is the problem or the controls or something that has to do with it not telling the compressor to engage or telling the ECM that the A/C is on.