A/C compressor pressures?

Hi,

It sounds like either the compressor is failing, or the compressor clutch isn't fully engaging.

I question the pressures. If the ambient temperature was 90 degrees F, the low-pressure reading you have is perfect, but the high pressure is very low. I would expect it to be around 250 PSI to 270 PSI.

When the system starts to build pressure, are there any odd sounds you are noticing? Also, take a look through this link and let me know if anything helps:

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

Let me know.

Take care,

Joe

Hi Joe, thanks for the reply. The compressor is quiet as a mouse, no strange noises. The temperature was 87 when I got those pressures. I believe my compressor is variable displacement. On cloudy days it works great, but when the sun comes out or in the heat of the day it barely keeps the car cool. Thanks again.

Hi,

If it is variable, I would still think the high pressure would have been higher, especially if it wasn't cooling and the temperature was near 90.

Do me a favor. Let me know if the system has automatic climate control or manual control. I want to read through the diagnostic info, but it goes two different ways based on the system. See pic below

Let me know.

Joe

See pic below.

Hi Joe. It is manual.

Hi,

Thanks. I went into the manual diagnostics and found nothing. See pic 1.

Since it takes a couple of minutes until the pressure builds, my first suspects are low refrigerant, or the compressor is failing. The compressor itself would be more likely with the pressures.

Have you tried vacuuming the system down and then recharging it?

Let me know.

Joe

See pic below and sorry for the manual's lack of help.

Hi Joe. I fixed my A/C today. I changed out the solenoid valve and my pressure returned to normal. At 85 degrees I'm now getting 35 low, 210 high and cooling at 50 degrees. Thanks for your help.

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