A/C not cooling

Tiny
STEVE W.
  • MECHANIC
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Try this chart. Should show up very large if you just click on it. The thermistor controls a couple items to keep the core from icing up, You might be able to run without it but that isn't something I've ever tried as having the core freeze up isn't a good thing.
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Monday, March 22nd, 2021 AT 3:24 PM
Tiny
A1953
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That worked to read the table. Thank you. I will check the resistance out and let you know what I find. If the resistance is correct, and the evaporator is icing up that often, what might be the cause of that?

Understood about running the A/C without the governance of the sensor. Just running it intermittently.
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Monday, March 22nd, 2021 AT 9:04 PM
Tiny
STEVE W.
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If it's still icing up it could be a few things. The system is slightly over or under charged. Or the air is very humid and the moisture is the problem. For the over/under charged issue the icing would occur because the refrigerant is lowing the temperature too far in both cases. Sounds strange but that is why the pressures are critical as either side of "correct" will cause similar problems.
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Tuesday, March 23rd, 2021 AT 1:39 AM
Tiny
A1953
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Your generous sharing of your knowledge is invaluable, Steve. I cannot thank you enough.
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Tuesday, March 23rd, 2021 AT 8:19 AM
Tiny
STEVE W.
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It's what we do. Just can be interesting sometimes when a problem just doesn't want to be repaired.
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Tuesday, March 23rd, 2021 AT 11:47 AM
Tiny
A1953
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Finally got to try for resistance.273 @ 80 degrees so I guess I will replace the thermistor. Still using A/C intermittently and still working well. Thank you again for sticking with it to the end. That was quite a puzzle.
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Wednesday, March 31st, 2021 AT 11:31 PM
Tiny
STEVE W.
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That would do it. The system thinks it's freezing up and shuts down then warms up just enough to work. Thank you for being diligent in tracking the problems. That is the bigger item. Thank you for using 2CarPros.
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Thursday, April 1st, 2021 AT 8:16 AM

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