Hey all, So, the dealership couldn't figure it out, other message boards couldn't. Can you???
I have a 2007 2.5i Outback 5sp. Whenever I have the A/C on the highway, every 10-30 seconds i get a hiss from the dash (what i suspect is the expansion valve.) I can hear it over the radio and get's quite irritating on long drives. Right after the hiss, i notice that the A/C blows out much colder air. I hear nothing driving around town and also notice that the cold air is more consistent, that is not this cold air/ warm air cycle.
I did a little test in the parking lot and noticed that A/C will hiss if i rev the car up to 3000rpms while in nuetral. Lower RPMs seem to be fine for the A/C
Any ideas what could be wrong? Thanks for all of your help