AC not working

Check the low pressure switch, it's on the low pressure line, At compressor, If out of R134a, and compressor can run, switch is defective. This will overheat the compressor, no oil running through it!

DIAGNOSIS AND TESTING - A/C EXPANSION VALVE The expansion valve is located on the engine side of the dash panel, near the right shock tower. The expansion valve can fail in three different positions (open, closed or restricted). In an Open Position: this will result in a noisy compressor or no cooling. The cause can be a broken spring, broken ball or excessive moisture in the A/C system. If the spring or ball are found to be defective, replace the expansion valve. If excessive moisture is found in the A/C system, recycle the refrigerant. In a Closed Position: There will be low suction pressure and no cooling. This may be caused by a failed power dome or excessive moisture in the A/C system. If the power dome on the expansion valve is found to be defective replace the expansion valve. If excessive moisture is found recycle the refrigerant. A Restricted Orifice: There will be low suction pressure and no cooling. This may be caused by debris in the refrigerant system. If debris is believed to be the cause, recycle the refrigerant and replace the expansion valve and receiver/drier.

Check coolant level first to ensure there is enough coolant in system.

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HI there,

Thank you for the donation,

If the second mechanic could not find a leak, why did he have to re gas the system? Well I think that if the system was low and he could not see any evidence of a leak with the dye, there may be a small leak at the evaporator, (this is hidden under the dash and you can't see it) you may have to get an electronic gas sniffer test in the vent as if the evaporator is leaking this will pick up refrigerant in the vents, try this next.

Mark (mhpautos)

First, the person who said their was a leak and no Freon was in the system seems to be wrong. If the system was working for 2 days, there has to be freon. Could their be a leak? Yes, there could. If you have the vehicle at the shop, they should have a freon sensor that basically is like a dog sniffing out its prey. If freon is present (leak), the sensor indicates it. Also, that would tell the mechanic where the leak is located.

Has the person who had it working checked for leaks?

Hello,

It sounds like you have a compressor going out, you will need to connect a gauge set to see both high and low side readings.

Here is a guide to help you get started:

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

and

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

and

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

Please let us know what you find.

Cheers, Ken