A/C, what should the low and high numbers be on this car when warm?

Good evening,

The high side should be 2 times ambient temperature or out air and the low side should be 25-30 pounds rock solid.

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

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

Roy

45 is too high. It should be 25 to 30.

No, a weak compressor will not build pressure.

The 90 on both indicates a possible compressor. If the compressor is engaged then it needs a compressor.

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

I attached the procedure for the compressor replacement.

I also attached the wiring diagram for the compressor in case it does not engage.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

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

Roy

When the system is not working, the pressures are called static. Those pressures should be equal on both the high and low sides and within 5 degrees of outside temperature.

Roy