When I turn on the defrost it makes clicking noise on passenger side vent
SOURCE: how to reset the HVAC
You have a problem with mode mode control switch, it is either leaking vacuum or has no vacuum to it, all of the different modes are switched using vacuum operated air door motors to send air to the selected outlet, i.e. floor, dash. defrost or a mix.
SOURCE: Clicking noise when using defrost setting
maybe a coin or piece of paper or small screw has fallen into the vent from the top of the dash near the vent holes, where the air comes up to the wind shield
SOURCE: clicking noise in passenger dash
This is a motor that controls the air doors like temperature, defroster, floor air and vent air distribution. You have up to three different ones and one of them need to be replaced.
SOURCE: my 2002 trailblazer is making a clicking noise in the a/c
more likely a broken door in hvac case.with car running work controls and watch actuaters operate to locate good luck maybee a little challange
SOURCE: 2003 Trailblazer No air from front face vents
first check to see if you have power going to the actuators when you switch the switch to it location if no power replace controller if you have power and no movement from actuators replace actuator. if actuators move remove hvac box and check for broken blend doors.
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