Contents Wiring diagrams Section: Automatic HVAC System All sections

A/c-Heater System: Overview Lexus SC I

Automatic HVAC System 1 illustration
WARNINGTo avoid injury from accidental air bag deployment, read and carefully follow all SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM procedures in the AIR BAG RESTRAINT SYSTEM article in the ACCESSORIES/SAFETY EQUIPMENT section.
CAUTIONWhen battery is disconnected, radio will go into anti-theft protection mode. Obtain radio anti-theft protection code from owner prior to servicing vehicle.
ApplicationSpecifications
Compressor TypeNippondenso 10PA20 10-Cyl.
Compressor Belt Tension(1)
Compressor Oil Capacity (2)4.1 ozs.
Refrigerant (R-134a) Capacity31.7-35.3 ozs.
System Operating Pressures (3)
High Side199-228 psi (14-16 kg/cm 2 )
Low Side21-36 psi (1.5-2.5 kg/cm 2 )
(1) Belt tension is maintained automatically. (2) Use ND-OIL 8 (Part No. 38899-PR7-003). (3) Specification is with ambient temperature at 86-95°F 30-35°C) and engine speed at 1500 RPM.
(1)Belt tension is maintained automatically.
(2)Use ND-OIL 8 (Part No. 38899-PR7-003).
(3)Specification is with ambient temperature at 86-95°F 30-35°C) and engine speed at 1500 RPM.

A/C-HEATER SYSTEMS SPECIFICATIONS

DESCRIPTION

An Electronic Control Unit (ECU), located within the A/C-heater control panel, automatically controls all air conditioning and heating functions. Manual controls allow the driver to select air distribution mode and desired temperature. In addition to normal A/C system components, the system includes various motors, controls, and sensors. (Scheme 1) The system has self-diagnostic capabilities.

Scheme 1

Scheme 1: DESCRIPTION