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How To Recharge Your Air Conditioner with Freon

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4 of 10

Assembling the Recharge Kit
Assembling the AC pressure gauge.

Attach the hose to the pressure gauge.

photo by Matt Wright, 2008
With the piercing pin safely retracted, you can assemble the pressure gauge and the kit. Screw the rubber hose onto the pressure gauge and tighten it. You don't need to screw the whole thing onto the top of the can yet, we have something to check first.

Now's also a good time to calibrate the gauge. This is a basic procedure. On the face of the gauge you'll see different temperatures. All you need to do is turn the calibration dial to the outside temperature (how hot is it today?).

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