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Hi Im David, thanks for visiting the site. If you are hearing a hissing sound from the passenger area of the dash then its probably a broken or disconnected HVAC vacuum line. if you look up under the dash on the right side you should see a plastic clear connector with a bunch of vacuum lines going to it. make sure they are all attached.
ok, please standby
is this a manual single zone climate control or an automatic dual zone?
you need to check the yellow highlighted vacuum motors to make sure the vacuum lines havent come off. the red circle is actually where the vacuum junction connector is on your mode
i will send you the procedure
sit in the truck. key on. engine off. operate the temp selector for the passenger from hot to cold. then back to hot. tell me if you hear an actuator moving. then do it for the drivers side temp control. let me know
ok, now start the car, turn the ac on full blast, see if you can stick your head up under the dash to see if you can hear where the hiss is coming from.
thats where the air inlet vacuum motor actuator is. . you need to have the refrigerant level checked before we go ripping apart the dash
just checking in to see how its going
hows it going?
just checking in to see if you wee able to find anything out
glad to hear it.