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Diode?? You mean thermal protector??
 

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It's just there to prevent a voltage spike.....

"Audi issued a service bulletin, Group 87 # 92-02 on 4/08/92 for the 1988-91 Audi 100/200/V8/80/90 indicating that a new A/C compressor relay and a different compressor magnetic clutch wiring harness with a zener diode was used to eliminate a voltage spike that can occur when the compressor clutch cycles on and off during normal operation."
 
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