How to jump the A/C relay?

Hi,

If the pressure readings in the pic are static pressures, that seems high. Keep in mind, that the pressures can be different based on ambient temperature when checked.

However, if the pic above shows static pressure, that is a bit high. If it is accurate, the system is overcharged. See pic 2 below for acceptable static pressures based on ambient temperatures.

As far as the relay, it is in the under-hood fuse box. Remove the relay and inspect it. Each of the four pins will have a number. The numbers are 85, 86, 87, and 30.

You need to locate pins 87 and 30 and where they connect in the box. Those are the two pins that will send power to the compressor (if power is available).

Pin 30 receives power from the compressor clutch 10 amp fuse. So, before jumping it, check that connector to see if there is power. It should be present at all times.

Keep in mind, based on the provided readings, the system may be over-charged. Pay attention to the pressure readings. You don't want a compressor to fail or a hose. Actually, you don't want anything to fail due to high pressure.

Let me know what you find. Also, here is a link you may find helpful for testing the relay and relay circuit:

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

Take care,

Joe

See pics below.

Hi,

That is my concern. When I say static pressure, it refers to the system at rest long enough for the pressures to equalize. You're are high. If you noticed, above 100 degrees the list indicates 100 psi as expected. You are well above that. I just don't want you getting hurt if something let's go. What I would recommend is to evacuate the system and then recharge it.

Here is a link explaining what I mean:

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

By any chance, did you try charging the system?

Joe

Hi,

If the compressor is engaging, what are the high and low pressures when engaged? Also, what is the ambient temperature when checked?

Let me know. Also, have you checked to make sure there isn't an issue with the blend air door in the vehicle?

Let me know.

Joe

Hi,

The high-pressure side will tell us if there is an issue with the compressor. As far as the blend air doors are concerned, that is a theory in the event the compressor is working. When it is running, do you notice any temp changes in the lines?

Let me know.

Joe

Hi,

Are both pics with it off? If so, what is the pressure with the system running? Let me know. The pressures have equalized, but they are different readings. That is why I'm asking if pic 2 was with it running.

Let me know.

Take care,

joe

Hi,

Thanks for the information. Based on the readings, I suspect the compressor itself has failed. The low side pressure should never get that high and the high side doesn't change. Other than the compressor, the expansion valve could be plugged. Something is backing up pressure on the low side.

Have you replaced the expansion valve? If so, then my first suspect is the compressor. This can happen with a faulty compressor because the compressor is not creating enough suction to draw in refrigerant effectively.

Let me know your thoughts and questions.

Take care,

Joe

Hi,

Thanks for the update. I just wish it was better news. If you plan to replace the compressor yourself, here is a link that explains in general how it's done:

https://www.2carpros.com/articles/replace-air-conditioner-compressor

If you look below, I attached the directions specific to your vehicle. Note: There are two different designs that were used. I picked the one that should be on your vehicle. If the compressor mount looks different, let me know.

Take care,

Joe

See pics below.

Hi,

Thanks for the update. I'm glad to hear it's working properly again.

Feel free to come back anytime in the future.

Take care,

joe