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A good place to start is 80 percent of the original charge. IE: if your truck took 2.25 lbs of r-12, then multiply 2.25 x .8 = 1.8lbs x 16oz = 28.8 oz.
Check the schrader valves where you charge the A/C system if it has threads on it like you can screw on the A/C manifold gauges then its R-12 if it has the type that couple on and no threads then its R-134 but make sure no one has screwed on some 134 fittings on them. Normally on the outside there it should tell you what type freon that vehicle should take you need to look around under the hood at the labels and see if you cant locate it.
If you are getting a high reading then you have a problem with the system. Only other thing is make sure you have the valve turned off, The gauge and R-134 connected and then slowly turn the gauge handle. Sometime these will give you a high reading if it wasn't hooked up correct. The system was modified so the gauge will fit on the low pressure side. Good Luck.
When recharging the ac you need to recover the old refridgerent. That means you have to take out all the old 134 and replace with new 134. On the engine sticker under the hood should tell you how many pounds of 134 it takes. When put in the 134 make sure your ac is on high.
LOW PRESSURE PORT HAS A BLUE CAP ON IT.MAKE SURE YOU ARE USING REFRIGERANT R-134 BLUE CHARGE HOSE.R-12 CHARGING HOSE WILL NOT FIT R-134 SYSTEMS.SEE YOUR CAR HAS R-134 REFRIGERANT SYSTEM. THE EARLY 90S CARS HAVE R-12 REFRIGERANT SYSTEM.YOU NEED R-134 CHARGE HOSE SET.
Depending upon the way you charge it you could introduce air into the system. The lines need to be bleed before charging to make sure the refrigerant is in the charge lines and not air. Most folks that do not do this for a living make that mistake.
With air in a 134 system problems will abound. The only way to really charge a system is to use a vacuum pump to pull it down then charge to the correct lever in ounces as provided on the label of the refrigerant u purchase
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