Posted by jimg.allentown on April 27, 2019 at 17:46:35 from (173.49.138.229):
In Reply to: Question on AC posted by David G on April 27, 2019 at 16:48:55:
Should be around 60 to 80 psi at rest - compressor not running. In general, what you are reporting (38psi) is not enough to activate the low pressure cutout. Compressor will probably not run at that pressure.
I strongly oppose department stores selling A/C products for the simple reason that untrained users CAN injure themselves as well as damaging their A/C systems if not used properly. BUT, as long as it is suggested, I add a few suggestions of my own.
Try to avoid introducing any more air than necessary into the system. Within the A/C system, air is a non-condensable gas and will not contribute to cooling. It might be advisable to add a couple ounces of the correct oil to the system. Since the A/C is a sealed system, refrigerant loss usually means that there is also some loss of oil. Oil circulates along with the refrigerant. Excess of what is circulating accumulates in the receiver/dryer and in the compressor sump.
Also note that the refrigerant and oil used is dependent on the year of manufacture of the car. 1993 and older mostly use R-12. 1994 and newer mostly use R-134a. 1994 was supposed to be the last year that R-12 was "legal" to use by the manufacturer. If you have an R-12 system, it should be converted to R-134a. That would require recovering and evacuating the system and must be done by a professional. Otherwise, you can just add some refrigerant if it is a R-134a system.
The best way to tell how the charge level is would be by feeling the hose exiting the evaporator. The change in state of the refrigerant from liquid to gas should complete just as it exits the evaporator. When the low side line (the larger one - also called the suction line) starts to get cold, the charge is close to correct.
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