[kmakovac]

so after 2/3 hours on +2°C out i resolve the problem:

- i change all the temp.sensor-nothing
-change the ventilator cabine module/gauge-nothing
-try the vakuum valve-engine compartment-OK

so i seet 10 min and try to understand:
when you press the defrost switch everything work fine,the vaccum valve open and heating works fine.This situation bypass all the sensors and force full heating.
In global heating works,so the problems is in the sensors or comand.
hange the sensores,measure it and all OK.
Problem with the AC module?Change it and nothing.

What remain?Cables,shorts.

I try to make better conections on plugs with a little screwdriver and WD-40 and everything turn to normal!!!

So the issue was been lost of contacts in the plug"A" to modul,maybe for my 18" wheels....

Interesting Gremlin....