• 8 Posts
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Joined 1 year ago
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Cake day: June 23rd, 2023

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  • When you flushed and replaced the coolant did you draw the lines down with a vacuum pump before filling with new oil/coolent? If it got moisture in the line it might have caused junk to form in the metering tubes? You can use an inspection camera to see if there is frost covering and blocking the airflow through the evap coil

    Also as @jk43 said check the schematic and see it there is a high temp thermostat on the compressor, might just be a bad thermal switch or something wrong with the compressor


  • Not an HVAC pro but these are a couple of things I can think of,

    1. check to see if the compressor pump is turning when it stops cooing, might be an issue with the electric clutch on the compressor. also check the voltage at the clutch if it stops engaging to see if it’s the clutch or something else causing it to stop
    2. to much coolant line, is it over pressure? have you been filing the R134 yourself from small cans? it could be “icing up” due to to high of a head pressure at the compressor. check the pressures both at the high side and low side with a gauge set
    3. blocked drain line, the coil in the car will condense water that drips down and out of the car with the drain line blocked drain could cause it to ice up
    4. blocked/low air flow will also cause it to ice up make sue that both the evaporator and condenser coil are free of junk, a layer of dust can often form lowering the airflow past the coil causing it to ice up, you might need a inspection camera to look at the coil inside the car without taking the dash apart














  • I know someone who is in engineering at one of the big Auto makers, we where discussing this issue and the person told me that even if you remove the SIM (disable cellular internet) The dealer we still upload all the data from the “black box” to the auto maker when they connect to OBD / CAN diagnostic port in your car during service. The manufacturer’s service software just does that now the tech does not even have to initiate it. Also some dealers can automatically connect using RF to your car as soon as you enter their lot, This can be by Bluetooth, WiFi, and/or the CAN bus via the keyless entry module or TPM (Tire Pressure Monitor). There was an issue a several years ago with hackers gaining access to Jeeps while on the road via RF.

    https://www.pcmag.com/news/hackers-remotely-hijack-a-jeep-crash-it-into-a-ditch