| Upper Flap Position
Motor
This is on the right hand side and is accessed by removal
of the instrument cluster Right hand drive or glove box Left
hand drive it’s the 75mm (3”) rectangular box
and is held in place by two 8mm? bolts the front one is a
breeze to undo compared to the rear one which is really close
to the firewall but it is possible (we haven’t broken
one yet) best to make sure the Upper Flap Position Motor is
faulty before removing it. You can run the motor but heed
this warning – if you let it run to the furthest extent
of its travel, that’s were it will stay as it jams and
then you’ve gotta rip it out.
You can test the motor using a PP3 (9volt) battery with the
wiring unplugged from the motor
A sticking Upper Flap Position Motor or Flap will causes
no air on the windscreen when Defrost (DEF) is selected.
Upper Flap Position Feedback Potentiometer
This is on the left side opposite the Upper Flap Position
Motor and can be accessed from the void left after removing
the glove box (RHD) /Instrument pack.(LHD)
Centre vent
The centre vent air flap is controlled by a vacuum solenoid,
once the Upper Flap Position Motor has placed its flap to
full cooling setting. The feedback potentiometer signals the
ECU to apply vacuum to the solenoid to open the vent.
Some simple tests
Remove one fan connector (pull plug or fuse) and switch system
to defrost mode and confirm that the other fan is working
then pull the tested fans connection and repeat to confirm
both are running properly. Service wise the biggest problem
with these fans is the brushes; just get some roughly the
right size but bigger than the originals and cut them down
to fit
If you disconnect both blower motors, you can hear both the
servo motors whirring in response to the temperature setting.
Just select Manual (Left Hand Control pulled out and alternate
the control between hot to cold and by sliding the blue/red
AIR control back and forth. For those who asked “What
does the control below the radio do” it biases the top
flap position only, this varies the temperature of the air
coming out of the side and centre vents. Moving it to the
blue (left) makes the air cooler at these vents than that
in the foot wells. Moving it to the red (Right makes it the
same temperature as the foot well vents.
A good indication that the ECU is controlling the system
correctly is when the car is cold, say in the morning, you
jump in, switch the control to auto, heat to hottest and turn
the ignition switch to the ACC position. You should hear the
fans start briefly and the vents motors spin. This is correct
behaviour as a cold heater matrix is detected by a sensor
on the flow pipe and tells the ECU not to activate the system
until there is sufficient heat in the matrix – this
only happens in the AUTO Mode. |
