I found out this cable on my z31 model 87'. Is my dads car and i have beign working On it trying to solve some electrical problems

 

​​​​​​​that is a heater box resistor or temp sensor -heater ,

 

Thank you! where should i look to connect this wire? Thanks so much for your help!!

 

That looks like the one that goes on one of the driver side ducts. There's one in the duct that crosses under the steering column for the face vent and the other in the little foot duct on the driver side. There's also one in the defroster duct but it has a black rectangular connector.

 

Do you have any photos or a diagram of this section ? I cant find where should it goes