that is a statement in fact but what is the question.
DIY or what? who to diagnose cars, or just want a wild guess.?
bad HVAC, heating and air conditioning system.
Those are damper controls.
and they are failing,.and on all cars the answers is the same.
the FSM covers this, got one(factory service manual, 2001 LC)
Thius car came with front and rear HVAC systems
ill guess front unit.
one of the most complex on earth (cars) RTM and see,!
1: controls not sending damper commands right.
be it (vacuum , cable or electric)
2: commands not reaching dampers.
3: stuck damper, or damper bad, bad sevor, or damper motor.
or if cable the cable fell off.
some cars use all 3 damper types. Vac, cable, electric motors.
get it serviced, or get the FSM and read the HVAC chapter.
all answers USA, nobody has ever said here, what country and
cars do vary greatly by country , big time.
so.... ill look the USA online page, for this car, alldata.com
ok back ....
its has 3 damper motors , all electric and expensive and hard to test
in the TOy dealer they can SCAN it and cycle parts by hand,.
that tells them what is bad.
in the FSM, it may show how to test the motors with out a scan tool.
each motor , (unit) works different in each car, so there is no way
tell you a test. by hand.
on my car the FSM has bench tests. or the motors.
here is your system.
the 3 red X are the motors.
the center is the brain.
making my 3 step tests, true. above.
bad input to controller
bad controller (nah)
bad damper. or its stuck.