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Car A/C Charging
So I have a 2007 VW Jetta and I just replaced the refrigerant control valve on the compressor. It uses refrigerant to control the displacement of the compressor. The r134a charge should be 525g +- 25g according to the sticker in the engine compartment.
What I've done:
Evacuated the Freon (shop did this)
replaced part
pulled a vacuum on the system with an electric pump
charged it with 2 12 oz cans
24 ounces is 680g so that means I should be 130g overcharged. I wouldn't have put this much into the system but the pressures were really low. Even after 680g the pressures were 35/150 when the lowest they should have been was 40/175. it was about 82F ambient. I don't know how the variable displacement compressor factors into this.
Some issues I can see:
Loss from can switch-out (no liquid left in cans)
Freon still in gauge hoses
Freon loss from disconnecting hoses
Cans not really 12 oz to begin with (china)
Increased system volume from oil loss (probably not much)
Should I put more in? Should I leave it alone? It works much better than it did before and I'm tempted to call it good. A/C is used year-round here.
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