Automotive Air Conditioning Information Forum

I did check pressure in system this morning with engine on. It was 72 F and system pressure around 73-74. That indicates that I have enough refrigerant.
An ambient temperature of 72°F is a bit lower than the ideal temperature for testing the pressures. Test them again at 85°F or higher, then post ...

Does your car still have R-12 and a Sight Glass on top of the Receiver Dryer? If so, and you have on hand or can still purchase R-12 refrigerant, you can do it yourself the simple, old-fashioned way without a shop's intervention, presuming you have a Manifold Gauge Set (MGS) with the proper ...

Does your car still have R-12 and a Sight Glass on top of the Receiver Dryer? If so, and you have on hand or can still purchase R-12 refrigerant, you can do it yourself the simple, old-fashioned way without a shop's intervention, presuming you have a Manifold Gauge Set (MGS) with the proper ...

You need to find a shop that services R-12 refrigerant; they would have equipment to pull out the remaining R-12 and weigh it, to determine how low your charge is.

From your pressure readings and that your high side line is only warm and not hot, plus your pressures (if measured at about 2000 rpm ...

I have a 1968 Buick Electra with factory AC. The cooling is not good at all. Low pressure is around 28 and hi pressure (from the comprrssor) is 110. Temp is around 70 F. Could the compressor be bad or the expansion valve? Im quite new to this.

I can feel that the gas commin out from the compressor ...

@thebandit

Too cold here now to get good readings. I found a great video from Chrysler Mastertech that explains a lot: https://www.youtube.com/watch?v=qNwStH5573c

Very nice tread!

Thanks! thebandit very helpful!

I did charge the system and the frost from the valve itself disappear. Cooler air from ac outlets now, but not that cool. The blend door cable was out of function, that's why I didn't get enough heat in the winter. Water valve seems to work and system sends vacuum as ...

Yeah, Im planning to upgrade it. I, and the previous owner, have been using it för about 5 years and the performance has declined over the last 3 years.

R134 and maybe a POA eliminator. Im not sure.

Thank you! I search for a proper gauge set.
The system haven't had a charge for many years. The air was quite cold a few years back so could be low on freon. Could a low charge cause a frosty POA valve?