In the past, when the AC blower wouldn't come on, I used to be able to jump start it by pressing the defrost button. Now that no longer works. The following have been tested and shown to be in working order:

Blower fuse
Blower
Blower regulator
I'm assuming CCU is working because I can hear the compressor click when pressing the buttons

Any ideas?

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'83 SD, 2x '85 SD
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