Hello to all of you.

I`m the owner of Volvo 960, B204FT engine. I have a problem, and I dont know where to start looking for solution.

Occasionally it happen, that car have low boost, and my AC compressor go off. I also noticed, that when this is the case, my cooling vent is ON, and my idle is high (about 1100RPM) I check blink code, but there is nothing.

By looking wiring diagram, AC compressor, and boost valve are controlled by TCU unit.

Any tought where to start?

Thanks in advance,

Peter