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With the newer systems, you CAN'T measure pressure-side readings anyway, so don't be forced into thinking that there is no other way. Even professional A/C techs can't service Volvo A/C with any other readings than the low side pressure, on newer factory-fill R134 systems. You just have to charge EXACTLY the recommended amount into the system to know that you have the right amount.
You have to consider a few things.
One, you changed the fixed orifice with a brand new one straight from the Volvo kit. If you didn't your conversion is going to stink.
Two. The low pressure reading is obviously high, but sounds as if it got better along the way. That's a good sign. I don't think that 22oz is enough.
To get better (faster) charging, you can always run a garden hose over the condenser and raise the idle speed. If you are trying to charge, you're looking for LOW suction pressure. You can achieve low suction pressure by hosing the condenser and turning the inside air to floor setting, fan position II. If you get the low side too high, you'll find that it won't take refrigerant.
Also, the high low pressure readings might be a result of leftover air in the system from not vacumming it out before charging. You should ideally vacuum out the system to get the moisture out.
One thing that will/does help your conversion, is to look for the high pressure fan switch on the high pressure line, along the right side frame rail in the engine compartment. It's somewhere in the vicinity of the alternator forward, but it's a little "J" that comes off of the high side pipe. Take the wiring harness OFF of that switch, put a wire between the two terminals of the wiring harness, tape it all off, and now the condenser fan will run whenever the system is on. That becomes a big help later on.
Try getting the remainder of the charge into the system, but if anything, err on the low side. You'll otherwise see too much system cycling from the A/C. You might want to set the pressure switch to about 22lbs if not even 20-21. That keeps the evaporator cooler, and means more cool air from you. It prevents the system from cycling out at higher temp/pressure. That is a very good way to drop the output of the system significantly. You should see temps in the high 30s during the day.
Believe it or not, one other coolness factor, is to coat the dashboard with STP Son of a Gun protectant (or the protectant of your choice). The gloss will reflect on the windshield, but it'll keep a LOT of heat out of the cabin. Vent temps won't change, but the interior temp will change for the better.
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1992 940 wagon, 72k
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