Our 2001 V70 -AC shuts off during driving and wont come back on until car is stopped turned off and restarted, you can hear compressor kick on but wont stay on regardless of temp control setting.

Fuel is probably stale. Pump or pump relay might be stuck.

I suggest you check the fuel delivery to the fuel rail. If no delivery the pump isn't working and the supply should be checked and then take the appropriate action depending whether the supply is good or not.

I wouldn't run it till the freon level was checked; if it's low, you could damage the compressor.

its hard to say is your ac compressor kicking on i need more details on where the clicking is coming from ac compressor is a guess due to it raising rpms when turned on and makes clicking noise turning on and off

you need to check the pressure of the system if the system is a little low on freon it will cycle more also if the cooling fan is not working the pressure will raise and also shut off

I would suspect the AC compressor cycling switch (located in low pressure line from compressor) or a AC cutoff wide open throttle relay ( in under hood fuse and relay center) would be causing this problem.

I passed this question the first time I read it, so I will take a stab at it now.
The fans don't come on until the compressor has pumped the freon pressure up to say 150 or 200 psi. And the compressor clutch has to have voltage to engage the clutch.
I wonder if the clutch is going and needs 14 volts instead of 12 to engage ? Or the relay that powers the clutch ?
Speeding up the engine would increase voltage from the alternator.
This is assuming the serpentine belt is tight and everything else is working correctly.
I think I would swap the relay with another and put a meter on that circuit to the ac clutch to see what it takes to engage it.

There may be a restriction in the plumbing of the air conditioning system that is making the high side pressure too high, thus shutting off the a/c for safety reasons.

Or, the refrigerant pressure on the low side is too low, caused by not enough r134a refrigerant in the system.

i presume it was recharged by a certified hvac tech, then take it back that should still be under warranty,otherwise check your a/c relay hvac /fan fuse control circuit,with car engine turned off switch on ignition,but dont start,you should hear a click from the clutch magnet on the compressor,and if possible check for 12volts d.c. at clutch wires lack of voltage wont let comp operate,then it needs to be diagnosed from clutch back thru to fuse/relay panel

start with having the pressures checked, sounds like your compressor is cycling off due to low pressures...

I had exactly the same problem. When your engine is cold and off check the gap on your ac compressor with a feeler gauge, it should be between 0.3 and 0.5mm. If it is larger you need to re-shim which invloves undoing a nut on the end off the compressor and removing the clutch plate, then removing the appropriate shims (look like washers) then replace. The reason it blows warm after 10 minutes or so is because the ac compressor gets hot and the clutch gap gets too large for the electro-magnetic clutch to engage. Some people would say that you need a new compressor but all you need to do is a re-shim.