CORRECTION : What I called a 'diverter valve' is actually an 'expansion valve'.
Look to the inside of the big black brake booster against the firewall, you will see a silver thing with a round top-hat.
That's it.
Be aware that to replace it, a complete evacuation and recharge is required, and it's illegal here to just vent the freon, probably there too.
Requires a dedicated machine to accomplish that task.
And, anytime you do this, you also need to replace the drier-receiver ( part # 12 ).

( the valve is part #26 below, and the hose that should be cold is part # 6 )