a/c hissing noise from under dash

[tngolfnut]

Hi, I have a 2002 dodge grand caravan 3.8lt v6 with rear a/c. I have had a hissing noise from under the dash for a couple of years now. I replaced the evaporater/drier and expansion valve acouple of years ago because the evaporator started to leak. But, I had that noise before I replaced everything. My a/c is still charged and does cool, but I still have that hissing noise on and off and only when the a/c is on. Any body know what is causing it and how to fix it? Thanks.

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[mr_mahoney]

Same here on my 2000 Dodge Grand Caravan. I replaced the evaporator, had a shop fill the system, I have the hissing sound, but I also have hot air. Please keep us posted on what fixes it.

[chopper]

A vacuum hose might be cracked or disconnected causing the hissing sound.This will also cause hot air to blow or the vents might not change .

[ecruz]

I've got an 05 Grand Caravan with separate climate controls. I've got the hissing and warm/hot air coming from only the driver side. Passenger side and rear is cold.

Anybody figured out the fix?

Thanks

[tenntech]

A/c hissing generally means the refrigerant level is low. Try adding a little freon.