07 diesel car.
seems to me ,you have a 2007 toyota COROLLA verso.
2.0 L 1AD-FTV I4
turbo diesel, ?
Ill quote wiki.
"The European specification Corolla Verso was available in Europe, Morocco, Kenya and South Africa."
sorry we cant get books on your car, here.(a usa forum)
you have HVAC issues. (heater is that it?)
try to say what works and dont, with heater.
do you have heat in any mode? y/n
does the fan blow? and make that normal blower sound?
if only one part of vents make heat, and not the others
that means the vent damper is failing, or controls to it are failing.
the FSM book covers HVAC, all tests. buy one.
this is USA forum so our books do not match non usa cars.
so what country are you in, ???? we cant guess that.
what to do:
check fuses first.
so got to your (DIY?) dealer buy the factory service manual
read HVAC chapter.
or get car serviced,
my guess is you have a bad damper actuator, cause unknown..
can be controls , wires or a bad damper actuator (or motor)