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 (20.3 psi), 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 (21.8 - 24.7 psi).

OK - Test Complete

NOT OK - Replacing Component