Recharging an air conditioning system on a 1998 Jeep Grand Cherokee is an easy task that can save an owner a repair bill from a professional mechanic or authorized service center. Charging the system can be done by most novice mechanics, as most auto part stores sell everything needed to recharge the air conditioning system in your own garage. However, safety goggles must be used when working on the pressurized air conditioning system.
Step 1: Locate the low-pressure port on an air conditioning line near the coolant reservoir bottle, and remove the cap covering it.
Step 2: Attach the end of the air recharge hose to the low-pressure port.
Step 3: Attach the can of refrigerant to the valve-end of the hose. Turn the valve handle to pierce the can of refrigerant, then turn the handle in the opposite direction to open it.