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Evacuating A/C System
Use this procedure to remove air and moisture from vehicle A/C
system.
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If gauges indicate pressure, recover refrigerant from
service hoses before proceeding. Refer to Evacuating
Service Hoses in this Chapter.
1. Open the following:
— Red service hose hand valve or coupler,
— Blue service hose hand valve or coupler,
— High side manifold hand valve, and
— Low side manifold hand valve.
2. Turn Compressor switch ON.
3. Turn vacuum/recycle valve to VACUUM.
Low side manifold gauge shows vacuum increasing.
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Follow manufacturer recommendations for evacuation
time, usually at least 30 minutes.
4. Close manifold hand valves when desired vacuum and
duration have been reached.
5. Turn Vacuum/Recycle valve OFF.
6. Turn compressor switch OFF.
COMPRESSOR ON indicator goes out and compressor
stops running.
7. Monitor low side pressure for 5 minutes.
Any rise in vacuum indicates a leak in vehicle system.
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If source of leak cannot be determined, partially charge
system and perform leak test using electronic leak
detector.
8. When leak is identified, repeat Recover/Recycle
proceedure, repair leak and attempt Evacuation
proceedure again.
Evacuation is complete.
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