A/C blowing warm air?

Hi,

Are you seeing 150 PSI on the low-pressure side of the system? What is the high-side reading? Also, what was the outside temperature when you checked the pressure? If the static pressure is 150, the outside temperature should have been approximately 110 degrees F.

Next, I realized you checked the relay and fuse. I attached a pic below showing the fuses related to actuating the compressor clutch. At the relay, there are 4 pins. If you remove the relay, there will be numbers identifying each pin.

On the relay primary side will be pins 85 and 86. On the relay secondary will be 30 and 87.

Here is how this works. When the A/C is requested on, the powertrain control module provides a ground path to the relay primary side (either pin 85 or 86. Each manufacturer can be different). When that ground is provided, then power from fuse 36 (under the dash fuse box) runs through the relay creating an electromagnet. The magnetic field draws the switch closed on the secondary side and power is then able to reach the compressor clutch.

Here is a link that explains it in more detail:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

What we need to do is check if the fuses are good and have power first. Then, remove the relay and with a test lamp, check the connectors. One of the pins will have constant power regardless of the ignition key position. (Secondary pin 30 or 87) If that is present, we need to check the primary side for power and a ground signal from the PCM. First, determine if it is pin 85 or 86 that has power with the key on. Once that is determined, check the other primary pin (55 or 56) for a ground path.

To check for a ground path, connect the alligator clip of a test lamp to the battery positive and probe the light to the ground pin. If a ground is present, the light will turn on. Note: the key has to be on and A/C requested.

I know that sounds like a lot, but it isn't too difficult. If you have questions, let me know.

Take care,

Joe

See pic below.

When the low side spikes to 150 PSI is the compressor running/have power to the clutch? Also, when the system is running does the condenser fan operate.

Check out this guide:

https://www.2carpros.com/articles/comprehensive-guide-troubleshooting-intermittent-automotive-air-conditioner-problems

Please go over this guide and get back to us.

When this happens what is the high side readings?

To confirm the low side is 150 and the high side 200 at this just happens at times. When the compressor kicks off the high side stays at 200? Can you please shoot a quick video so we can see what's going on?

Sounds good, let us know.