1990-1993 Lexus LS400, ES250/300, SC300/400 Service Manual

Comprehensive repair and technical service information covering the 1990-1993 Lexus LS400, ES250/300, and SC300/400 models. Ref: AC001-98

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Document Details

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Document Number / Seller:
26608 / Amy Lopez
File Size:
79.57 MB
File Type:
PDF
Language:
English
Pages:
4087
Printable:
Yes
Category:
Car
Last updated / verified
Dec 26, 2025

Models Covered & Key Technical Specifications

Lexus LS 400, ES 250, ES 300, SC 300 & SC 400 (AC001-98) - 1990-1993

The applied reference vault | applied segment.

  • Reference Power Draw: 10-14V signifies the standard operating voltage range.
  • Integral Ambient Limits: For optimal operation, 25°C (77°F) defines the ambient temperature limit.
  • General Feed Speed: 2000 rpm achieves the target engine speed for A/C operation.
  • Certified DPI Rating: The wiring harness requires 1 MΩ or higher for proper circuit continuity.
  • Factory Volume Data: 950 ± 50 g represents the standard refrigerant charge volume.
  • Established Circuit Specs: Below 1V determines the voltage for the manual magnetic clutch.

Professional Workshop Service Manual & Technical Specifications

Authoritative Factory Technical Manual: Lexus LS 400, ES 250, ES 300, SC 300 & SC 400 - Comprehensive Repair Manual & Technical Service Information Guide 1990-1993 Transmission-Guide

Model-Designation: 1990-1993 Lexus LS400, ES250/300, SC300/400 // Engine-Type: Air Conditioning System // Reference-Category: Technical Manual. Methodically calling for... Service sections detail...

Integrated-Framework Value Context
Air Conditioning System AC001-98 Technical Service Bulletin
Repair Procedures Page 3 Detailed steps for component service
Troubleshooting Page AC-21 Diagnostic procedures and solutions
Parts Information Page 1 Required parts for retrofit
Refrigerant Charge 950 ± 50 g Specified refrigerant volume

The microprocessor controlled automatic air conditioner is a system which controls the cabin air conditioning automatically using a microcomputer. The microcomputer senses the air temperature outside and inside the cabin, the amount of sunlight, the compressor operating condition and temperature setting, etc. and maintains the optimum blower air temperature and air flow at the intakes and outlets automatically. The document includes coverage of various diagnostic codes and troubleshooting procedures. Repair information is provided for specific components and systems within the air conditioning unit. Verification procedures are included for checking system performance and component functionality.

FAQ

Calculate the **precise** pressure specifications for the A/C system? keyboard_arrow_down

13-15 kgf/cm (185-213 psi) is the high pressure reading to check for expansion valve function.

What values for **proper** assembly sequence are included? keyboard_arrow_down

10 N⋅m (100 kgf⋅cm, 7 ft⋅lbf) is specified for liquid tube connections to the condenser.

Assess the **standard** service interval parameters for the compressor clutch? keyboard_arrow_down

0.5 ± 0.15 mm (0.020 ± 0.006 in.) is the standard clearance for the magnetic clutch.

What components are **necessary** for system architecture? keyboard_arrow_down

ND OIL 6 or SUNISO NO. 5 GS is the specified compressor oil for receiver or evaporator replacement.

Confirm the **recommended** tool requirements for refrigerant handling? keyboard_arrow_down

AC-15 details the manifold gauge set installation and use, including charging hoses with stop valves.

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Reviews (4)

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This digital manual is comprehensive and very user-friendly. I appreciate being able to access it on my phone while working on my car. The download process was seamless, and I received a prompt response when I had a question. Very satisfied!
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This manual has been a lifesaver for my SC400! The troubleshooting section is incredibly detailed and easy to follow. The download was smooth and I received the link quickly after purchase. Highly recommend!
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If you own a Lexus SC400, you need this manual! It covers everything you need to know, and the maintenance schedules are a great help. The support team was quick and professional when I reached out for assistance. Great purchase!
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As a DIY enthusiast, this manual is perfect for tackling my Lexus SC400 repairs. The diagrams are clear and the instructions are thorough. Plus, the email support was super helpful—got answers to my questions within hours!