air conditioning NISSAN PICK-UP 1999 Repair Manual

SYSTEM DESCRIPTION
Component parts
Air mix door control system components are:
1) Auto amplifier
2) Air mix door motor (PBR)
3) In-vehicle sensor4) Ambient sensor
5) Sunload sensor
6) Intake sensor
System operation
Temperature set by Potentio Temperature Control (PTC) is compensated through setting temperature cor-
rection circuit to determine target temperature.
Auto amplifier will operate air mix door motor to set air conditioning system in HOT or COLD position,
depending upon relationship between conditions (target temperature, sunload, in-vehicle temperature and
ambient temperature) and conditions (air mix door position and intake air temperature).
When target temperature is set at 18ÉC (65ÉF) or 32ÉC (85ÉF), air mix door opening position is fixed in full
cold position or full hot position.
Air mix door control specification
RHA482H
RHA457H
TROUBLE DIAGNOSESAUTO
Air Mix Door Motor (Cont'd)
HA-2053