QuestionA/C clutch seized a while back so I had the whole compressor
replaced. The problem is that there is no current coming to
the compressor when turning on the A/C. Compressor works
fine when I jump it and I have made sure there is enough
freon in the system so low pressure should not be the
problem. Have checked A/C fuses and relay and even the
radiator fan fuses as I heard that would prevent AC from
coming on. Could it be the pressure switch that gone bad? If
so where is it located on a 300m (99)?
Answer/C PRESSURE TRANSDUCER
CAUTION: A/C pressure transducer switch connector terminal contacts can be damaged by probing tools during system diagnosis and repair. Failure to use their respective mating terminals or pin gauge to check for tightness will cause contact beam spreads. This will result in loss of continuity.
O-ring replacement is required whenever the pressure transducer is serviced. Be sure to use the O-ring specified for this vehicle.
The A/C pressure transducer is screwed on to a valve on the discharge line. The transducer can be removed or installed without evacuating the refrigerant from the A/C system.
NOTE: For 3.2/3.5L applications, the passenger side headlamp must be rotated out of the way to access the A/C pressure transducer.
REMOVAL
Open hood and disconnect the negative battery cable remote terminal from the remote battery post Negative Battery Cable Remote Terminal
Disconnect the wire harness connector from the A/C pressure transducer
CAUTION: A slight release of pressure trapped in the fitting may be experienced. It is not necessary to discharge the refrigerant system.
Remove the transducer with a counterclockwise rotation using a 14 mm open-end wrench.
INSTALLATION
For installation, reverse the above procedures. Tighten pressure transducer to 6 N·m (50 in. lbs.)
