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AV-SCANNER / Service function guides / Cooling and climate
This guide delivers a complete professional workflow for performing a cooling system pressure test, from understanding how the system operates under pressure to interpreting the gauge readings and deciding on the correct repair. It is written for working mechanics and serious DIYers who already understand basic cooling system layout and want a repeatable, diagnostic-grade procedure. By the end, the reader will be able to safely pressurize a cold system, isolate external and internal leaks, distinguish a failed pressure cap from a failed component, and document results for the customer or their own records.
Guidance is general and covers many makes. Exact procedures and values vary by model, so confirm them in the factory service information for your vehicle.
Download all 11 sections as a branded PDF to use in the workshop.
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