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What do I look for to know if adding freon is the correct action?

philso on Thu July 29, 2010 9:24 PM User is offline

A general question. 134a system. If the vehicle is blowing cold but not cold enough air what do I look for on gauge readings to tell if adding freon would help?
I understand the pressures vary with ambient air temp. and have seen that the pressures vary with RPM. The instructions I have seen say recharge to spec. but where do I find specs? I think I understand that a full charge is based on weight. I have seen the factory sticker under the hood that gives the weight. If I don't have a recovery system to weigh the refrigerant how do I use the gauge pressures as an indicator to know whether the system is low on freon? And how do I know when I have added enough?

Edited: Thu July 29, 2010 at 9:53 PM by philso

GM Tech on Thu July 29, 2010 10:42 PM User is offline

To do it right- get a scale- or have it done by someone who can weigh it in and out.....that is the only way to do it right.......You would not torque a bolt that has a torque spec without a torque wrench would you? So why do you want to add refrigerant to a system that has a refrigerant weight spec without a scale?

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

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