Most possible this issue where here earlier...... sorry, but I don,t see keyword search option in the forum. After all I detected, DIAKOIM air conditioning circuits some confusion.
According the wiring diagram first stage relay 15 amp fused for pre resistor mode ,activated ECT sensor , second stage 30 A fused relay activated the A/C compr. pressure switch. In case I close pressures witch auxiliary fan must run full speed without ignation.

Because not run, I checked the relay (below the fuse box), surprise: 15 A fuse burned out, on the first stage relay. I put a new fuse in, the fans running with closed pressure switch run slow speed -

What is that? it is possible the wiring diagram not correct, something is there some connection what not show.....???