Isuzu — Evacuation of the Refrigerant System
Maintenance · A/C system
From a Isuzu service manual — check it applies to your exact model before use.
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Procedure
- Connect gauge manifold (HI to discharge side, LOW to suction side).
- Discharge and recover the refrigerant.
- Connect center hose of gauge manifold to vacuum pump inlet.
- Operate vacuum pump, open shutoff valve and both hand valves.
- When low-pressure gauge indicates approx 750 mmHg (30 inHg), continue evacuation 5 minutes or more.
- Close both hand valves and stop vacuum pump.
- Check pressure does not change after 10 minutes.
- Again vacuum 20 minutes or more until 750 mmHg (30 inHg), close valves.
- Close positive shutoff valve; stop pump and disconnect center hose.
Tools required
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Specs & values
- 750 mmHg (30 inHg)
Source: Isuzu service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.