AC Hiss

Searched other posts for this and it seems that if you're getting AC hiss in the passenger compartment it might only be indicating a recharge is needed. Is that a decent assumption?

And a newbie question....why would it hiss in the rear AC? Isn't there just a blower sending chilled air back there? I would expect to hear hissing only where there's pressure.

Correct assumption. It's most likely low on coolant. That's good and bad news. The bad - you have a leak. Have them put a die in the system when you have it serviced so someone can trace the leak. Most shops do it automatically but, I would make sure.

There is a seperate evaporator with it's own blower in the back of the van so essentially there are two distinct A/C systems in the van pressured by the single compressor under the hood.