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Re: A/C 134a capacity
Posted by MS (more from MS) on Wed, 8 Jun 2005 12:09:29
In Reply to: A/C 134a capacity, KenB, Tue, 7 Jun 2005 13:46:54
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What can happen by over charging with R134a is that the o-ring seals and the compressor port needle valves can fail. I had one of the needle valves pop on me one day after a recharge, so I know first hand. Drawing a good vacuum before recharging with refrigerant helps toward reducing the internal pressure within the system, and lessening the risk of seal failure. 24oz is a little over the recommended max. What I do is to close off the screw valve on the attachment hose with some of the liquid refrigerant remaining in the can. I do it by feel when installing - shaking of the can while compressor draws it inside the system. I figure some 4 oz (could be 3) is remaing in the can. I keep the valve hose attached to the can so the remaining 4oz can be used to top up at a later date.
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