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Another DIY A/C charging/recharging question S90-V90 1998

Don't "force" the rest of the R134 in. You can over charge your system which is far worse than underscharging the system.

As jbowers stated, you can't accurately put in the correct volume unless you evacuate the entire system

The pressostat on these cars are set to turn the compressor on when the low side pressure drops to 25 psi and turns the compressor off when the low side pressure reaches 45 psi. The time it takes to do this (cycle time) is a function of the charge in the system and the ambient temperature.

DEWFPO
--
1998 S90 062,925 1995 964 145,750






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