Still with the A/C issue
09-13-2020, 02:57 AM
#1
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Join Date: Aug 2019
Location: Randburg
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Still with the A/C issue
Hi everyone,
I have posted about this issue before, but I have more info and I'm hoping someone might know something.
I have a 2010 JK with manual A/C.
My evaporator freezes up after about 15 to 20 minutes of A/C running.
I have since found that the compressor never cycles off but stays engaged permanently.
If I disconnect the pressure transducer the compressor cycles off.
If I disconnect the evaporator temp sensor the compressor cycles off.
I regassed the system and confirmed that the gas quantity is as per specification.
The high and low side pressures are ok.
I replaced the pressure transducer.
I replaced the evaporator temperature sensor.
Someone suggested to me to wire a resistor into the evaporator temperature sensor wiring as the sensor might be reading the temp too high, but that also doesn't help.
My Jeep stealer has no clue, in fact it turned out that they underfilled the system.
I believe that the signal from the temp sensor goes to the PCM. Could that be faulty? Or the TIPM? I don't think so because disconnecting the sensors cycles the compressor off.
Or, on the other hand, could the signals from pressure sensor or temp sensor be incorrectly processed by the control unit?
Is there a way of checking that without trying a new control unit?
I have posted about this issue before, but I have more info and I'm hoping someone might know something.
I have a 2010 JK with manual A/C.
My evaporator freezes up after about 15 to 20 minutes of A/C running.
I have since found that the compressor never cycles off but stays engaged permanently.
If I disconnect the pressure transducer the compressor cycles off.
If I disconnect the evaporator temp sensor the compressor cycles off.
I regassed the system and confirmed that the gas quantity is as per specification.
The high and low side pressures are ok.
I replaced the pressure transducer.
I replaced the evaporator temperature sensor.
Someone suggested to me to wire a resistor into the evaporator temperature sensor wiring as the sensor might be reading the temp too high, but that also doesn't help.
My Jeep stealer has no clue, in fact it turned out that they underfilled the system.
I believe that the signal from the temp sensor goes to the PCM. Could that be faulty? Or the TIPM? I don't think so because disconnecting the sensors cycles the compressor off.
Or, on the other hand, could the signals from pressure sensor or temp sensor be incorrectly processed by the control unit?
Is there a way of checking that without trying a new control unit?
11-12-2020, 03:45 AM
#3
JK Newbie
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Join Date: Aug 2019
Location: Randburg
Posts: 9
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I actually fixed it. I bought an electronic temperature control module with its own temp sensor. I set the temperature for the compressure to be switched on and off, and it's now working perfectly. Issue is that the PCM does not process the signal from the temp sensor correctly, even after I replaced the sensor.
