Vision V6-201 3.3L (1993)
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Pressure jumps to near 0 or 500 PSI are an indication of a faulty pressure transducer (or connector).
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Set the A/C controls as follows:
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A/C controls set to outside air
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Panel mode
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Full cool (full counter-clockwise position)
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Low blower (one notch clockwise from "OFF" position)
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A/C button in the "ON" position
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Vehicle windows open
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Recirc button turned OFF on Automatic Temperature Control (ATC) equipped vehicles
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Observe compressor clutch for normal cycling.
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If A/C system pressure is above 30 PSI and below 430 PSI and clutch doesn't engage, the transducer is not the problem. Perform usual
A/C diagnosis to resolve.
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Monitor A/C system pressure with DRBII.
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If pressure reading does not increase during compressor clutch 'on' periods, tranducer is suspect.
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Adjust A/C blower controls to high setting (full clockwise rotation).
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Let system run a couple of minutes to stabilize.
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Use previously mentioned rod to jiggle transducer while compressor clutch remains engaged.
BE CAREFUL TO AVOID ALL MOVING PARTS - BODILY HARM OR DAMAGE TO THE VEHICLE CAN OCCUR IF THIS
PRECAUTION IS NOT TAKEN.
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The pressure reading should remain in the normal operating range with minor pressure fluctuations occurring.
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Unusual pressure jumps (for example - 50 PSI) are an indication of a faulty transducer (or connector).
PARTS REQUIRED:
1
Transducer - A/C Fan and Pressure w/O-Ring
4723028
AR Connector Pigtail - A/C Transducer
4728323
REPAIR PROCEDURE:
This repair procedure involves replacing the A/C pressure transducer and wiring if required.
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With vehicle off, disconnect the transducer wiring connector and examine it for damage.
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If no wiring damage is observed, remove and replace the pressure transducer, per the service manual instructions. Torque to 6 N-m (50 in.
