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Home >> Volvo >> 2000 >> S70 L5-2.4L VIN 61 B5244S >> Repair and Diagnosis >> Heating and Air Conditioning >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Checking Air Conditioning (A/C) System Function and Noise >> Checking Air Conditioning (A/C) System Function and For Noise >> Checking Pressure Switch (Pressostat)
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Checking Pressure Switch (Pressostat)




Checking Pressure Switch (Pressostat)







- Filling point low pressure side (blue hose) connected to service valve.
- Engine idling.
- Place blower fan switch to position 0.
- Place Air Conditioning (A/C) switch to off,
- Disconnect the pressure switch (Pressostat) connector,

Start the compressor by connecting the magnetic clutch cable to the battery positive terminal.


WARNING
The compressor may be connected like this for a maximum of 3 minutes.


Connect an ohmmeter over both pressure switch (Pressostat) terminals.


NOTE: If the pressure falls below 140 kPa, but the ohmmeter continues to display 0 [ohm], stop and disconnect the compressor.


The ohmmeter should read infinite resistance at a compressor pressure of 150 - 170 kPa.

OK - Test Complete

Not OK - Refer to Replacing the Component.


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