Todd, what state are you in? In FL r134 is still freely available. For
$19 bucks online, you can take an open book exam to get the EPA license.
http://www.epatest.com/ to be able to get all other refrigerants.

The A/C is supposed to cut off when you press the gas pedal to to
bottom. Other than that, as far as i found in the service manual, the
only other switch is the pressure switch.

If the system has not been serviced before, you may need just to ad
refrigerant to it.

Good luck!

Sjnasca wrote:
> When my 2002 Outback is under load from passengers or cargo the AC
> stops working. It doesn't come back on until the car is driven at very
> slow speeds of stopped. I suspect that there is bad sensor. Does
> anyone know what controls this behavior?
>