A/C not cooling?

Hi,

The low-pressure side is the side you charge from. It shouldn't be nearly that high. Could you confirm that is what you found on the low-pressure side of the compressor?

Also, I'm wondering if the Schrader valve may be blocked. Do me a favor, check the pressure with the system off and after it sits for about an hour. Also, let me know if you have access to an A/C manifold gauge set. Also, let me know the outside temperature when you checked and found 120 PSI and if you had the engine running with the A/C on.

Let me know.

Joe

Hi,

At 95 degrees F, the low side pressure should be between 50 and 55 psi. It could be overcharged, have a blockage, or too much PAG oil in it. However, if you didn't add any and there wasn't a problem before, that wouldn't make sense.

Take a look through this link that explains the process of recharging it with a recharge kit from a parts store. See if anything helps.

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon

Also, allow the vehicle to cool off to the outside ambient temperature. Note: engine and AC off for about an hour. By turning it off, it will allow the pressures in the system to equalize. Then take a pressure reading and let me know what it is. With it off under these conditions, that pressure is referred to as static pressure. If you had a gauge for both the high and low sides, you would see the pressures become equal. Hopefully, I will be able to tell if the system is overcharged.

Here is the thing. If the low side is too high and the high side is low, it could indicate a compressor issue or the system needing to be serviced. (Vacuum and recharge)

On the other hand, if both pressures are high, that would indicate the system is overcharged.

I hope I'm making sense. LOL I can never tell by the time I finish typing.

Let me know.

Take care and Happy 4th!!!

joe

Hi,

Okay, here is what I need you to do. When you turn the A/C on and the compressor doesn't engage, I need you to check if there is power to the clutch coil (compressor clutch assembly). If there is, then we have a faulty clutch coil.

Let me know.

Joe

I'm starting to wonder if it was overcharged. You said you allowed the pressure to lower. Since then, it has been working. Is that correct?

Let me know. Also, if it changes, see if you can get your hands on an A/C manifold gauge set from a parts store. Often times, they will lend one to you. That way, we can check both the low and high-pressure sides.

Let me know.

Joe

Hi,

That is strange. So, you had it at 80 psi and then it went back to 120? Is that after starting the vehicle? If that is the case, either we have a blockage, or the compressor is failing.

At this point, we really need to see the high side pressure as well to compare. Do you think you could get the gauges from a parts store? Usually, they lend them out to people.

Let me know.

Joe