Defrost not working

Hi and thanks for using 2carpros.com

It sounds like the mode door actuator has failed. You said you replaced the "climate control" unit, which leads me to believe you are referring to the air temp actuator which has nothing to do with air flow direction. The mode door actuator is what directs air flow to different locations, including defrost. Here are the directions for removal and testing.

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MODE DOOR MOTOR

REMOVAL
1) Remove instrument panel.

2) Remove mode door motor.


INSPECTION



1) When approx. 12 V is applied to the mode door motor terminals, mdde door motor operates as tollows:


2) Check mode door motor position switch. When the mode door motor is moved to each mode position by using the mode selector switch, check if continuity exists between each terminal as follows:

INSTALLATION
- Installation is in the reverse order of removal.

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The last two pictures correlate with testing.

Let me know if this helps or if I misunderstood what you have already done.

Take care,
Joe