Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Hello my name is***** am an ASE Master Technician and I am glad to help you out with your question.
First, there is no high and low pressure switch on this system. It uses the AC pressure transducer located on the Filter dryer under the hood on the passenger side.The computer disengages the A/C compressor clutch when high side pressure rises above 447 psi and re-engage the clutch when high side pressure drops below 426 psi. The A/C pressure transducer will also disengage the A/C compressor clutch if the high side pressure drops below 16 psi and will re-engage the clutch when the high side pressure rises above 32 psi.Check to see if the PCM is sending a signal to TIPM to activate the AC compressor clutch. If so and the AC pressure transducer is working, then chances are the TIPM is at fault. However, the AC pressure transducer could be giving faulty readings as well.Two other sensors also could be a problem. The sun load sensor and the evaporator tempature sensor.
Based on my experience, if you jumper the Pressure transducer and the Compressor comes on, either the system is low on freon or the Pressure transducer is bad and needs to be replaced. You have indicated that the freon is full so that would only leave the pressure transducer.However, if the AC compressor still does not come on then I would suspect a bad sun sensor or evap temp sensor.IT is possible that the HVAC head unit is bad also. However, this should set a code.Check the A/C pressure in the data stream. This should match close to the actual pressure in the system. You can also see if the PCM is able to activate the AC relay by running the Actuator Test for the A/C relay. When you do this, it should turn the clutch on and off. Also, if your scanner can communicate with the automatic temperature control unit, check to see if there are any codes stored in the unit.Be sure that the evaporator temperature sensor in the Automatic Temperature control system is reading the same temp as the evaporator core.
Its integrated into the TIPM
You can jumper the light blue orange wire to the light blue brown wire at the AC pressure transducer with the AC turned on to see if the AC compressor comes on.
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ASE Master Technician