Air Mix Door Motor

* Manual Air Conditioning System *
TROUBLE DIAGNOSIS PROCEDURE FOR AIR MIX DOOR MOTOR

Inspection Flow:

COMPONENT DESCRIPTION
Air Mix Door Motor
The air mix door motor is attached to the bottom of the heater unit. It rotates so that the air mix door is opened to a position set by the PTC. Motor rotation is then conveyed through a shaft and air mix door position is then fed back to the push control unit by PBR built-in air mix door motor.

Air Mix Door Control Specification / Manual A/C:

CONTROL SYSTEM INPUT COMPONENTS
Potentio Temperature Control (PTC)
The PTC is built into the control unit. It has a variable resistance which changes according to the set temperature. This resistance is connected to the temperature control lever.


DIAGNOSTIC PROCEDURES

PTC
After disconnecting PTC harness connector, measure resistance between terminals 1 and 2 at PTC harness side.









PBR
Measure resistance between terminals 1 and 2 at vehicle harness side.






Ignition Switch: ON
Ensure tester pointer deflects smoothly when PTC is moved from full cool to full hot and vice versa.

Step 1 - 4:

Step 5:

AIR MIX DOOR MOTOR CIRCUIT

CONTROL LINKAGE ADJUSTMENT




Air Mix Door
1. Install air mix door motor on heater unit and connect it to the air mix door motor harness.
2. Set PTC at full cool and air mix door motor at "full cold".
3. Move air mix door lever by hand and hold it at the full-cold position.
4. Attach air mix door lever to rod holder.
5. Check that air mix door operates properly when PTC is moved from full cool to full hot.




Water Cock Control Rod
- Remove the air mix door motor before adjusting water cock control rod.

1. Push air mix door lever in direction of arrow.
2. Pull control rod of water cock in direction of arrow so as to make clearance of about 2 mm (0.08 in) between ends of rod and link lever and connect the rod to door lever.

After connecting control rod, check it operates properly.