This WorkStar HVAC service manual (publication S16025, 2005) is the factory heat, ventilation and air conditioning section for International WorkStar trucks. It documents system operation, every major component and the A/C performance test.
Official document details
| Brand | International Trucks (Navistar) |
| Model coverage | International WorkStar (7000 Series) |
| System / Group | HVAC |
| Publication no. | S16025 |
| Year / Revision | 2005 |
| Pages | 246 |
| File size | 3.4 MB |
| Format | |
| Language | English |
What the WorkStar HVAC service manual covers
- Safety precautions and general description
- System operational description and air distribution
- A/C refrigerant flow
- Electrical System Controller and RCD system
- Components — compressor, condenser, evaporator, accumulator
- Orifice tube, thermistors and heater core
- Control assembly, blower, temperature and mode control
- System maintenance and A/C performance test
Publication S16025 details the compressor and clutch, condenser, orifice tube, evaporator and accumulator, the Electrical System Controller and RCD system, plus an R134A system-pressure chart and the A/C performance test procedure.
Applicable truck models
This HVAC section covers International WorkStar (7000 Series) and related medium-duty trucks. Verify your control head before testing. More at the International Trucks official website.
Who needs this WorkStar HVAC service manual
A/C specialists and fleet shops use this section to diagnose weak cooling, replace evaporators and compressors and confirm charge against the pressure chart. It is written for trained professionals.
Diagnosis leans on the pressure-versus-temperature chart and the A/C performance test: record duct temperatures, thermistor values and transducer readings, then compare them before replacing parts. The orifice-tube system depends on a clean, properly evacuated circuit, so flush when required and add refrigerant oil only per the oil-fill guidelines. Recirculation and control-head faults are traced through the Electrical System Controller with the troubleshooting charts. If a thermistor reads more than a few degrees off its partner, or the transducer differs from the gauge set by more than twenty psig, the section points you to the exact circuit to check before condemning the compressor or control head.
The full PDF is available in the DiagTechPro manuals library — a free account is required to download. Each listing shows the exact publication number so you can match the document to your VIN and build date before downloading.
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