Hi everyone, I replaced the AC condenser on my 2017 Kia Forte LX, vacuumed the system, and let it sit for 30 minutes to ensure the vacuum held. When recharging, the high side pressure is low while the low side pressure seems normal. The compressor is activating (confirmed by feel and scanner), and the low-pressure line feels cold, but the air coming from the vents is still warm. I checked the blend door, and it seems to function correctly—extreme heat on hot, and warm air on cold. Does anyone have suggestions on what else to check?
If the high side pressure is low, it could indicate an issue with the thermostatic expansion valve (TXV). That might be restricting refrigerant flow.
Livia said:
If the high side pressure is low, it could indicate an issue with the thermostatic expansion valve (TXV). That might be restricting refrigerant flow.
Thanks! I’ll check the TXV next to see if it’s the cause.
Have you confirmed the refrigerant charge amount? An incorrect charge can cause issues with pressures and cooling performance.
Terryanne said:
Have you confirmed the refrigerant charge amount? An incorrect charge can cause issues with pressures and cooling performance.
I tried to follow the recommended charge amount, but I’ll double-check to make sure. Thanks for the tip!
Since one line is cold and the other is warm, the evaporator might not be getting enough refrigerant. Check the system for blockages or restrictions.
Lenox said:
Since one line is cold and the other is warm, the evaporator might not be getting enough refrigerant. Check the system for blockages or restrictions.
Good idea. I’ll inspect for blockages and make sure the refrigerant flow is clear.
Blend doors can sometimes appear to work but still cause issues. Have you inspected the actuator to make sure it’s not sticking or partially closing?
Callen said:
Blend doors can sometimes appear to work but still cause issues. Have you inspected the actuator to make sure it’s not sticking or partially closing?
I haven’t checked the actuator yet, but I’ll give it a closer look. Thanks for the suggestion!
If everything else checks out, it might be worth testing the compressor efficiency. Sometimes they activate but don’t compress as effectively due to internal wear.
MegWhitgal said:
If everything else checks out, it might be worth testing the compressor efficiency. Sometimes they activate but don’t compress as effectively due to internal wear.
That’s a good point. I’ll test the compressor if the other steps don’t solve the issue. Thanks!