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What should the pressure be when putting R-134a to recharge air conditioner?
Wiki User
∙ 18y ago
45-60. Anything higher could indicate a bigger problem. A 134a system is similar to a R12 system in that you have a chart listing temperatures and pressures, with 134a running slightly higher. That said, you need both suction and discharge pressures and outside/inside temperatures, along with engine speed to let someone diagnose your system. You also need to make sure that your compressor and all other parts - relays, fans, hoses not plugged by collapsed inner liners, etc. are functioning properly before "adding a can" of 134a. You can seriously overcharge if you don't know what you're doing. Best solution if everything is functioning properly, is to have a qualified mechanic empty the system, pull a vacuum and re-install the correct charge (weight of 134a). This is different from make to make, but is critical. A 134a system does not have the"bubble gauge" as a R12 system does, and it is easy to get under or over in the charge. Your mechanic will weigh in the correct number of cans for proper operation. when all else fails, try 34psi on the suction gauge. this is real close to where you need to be.
Wiki User
∙ 18y ago
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