Follow the Accumulator (round silver cylinder) low pressure hose to the fire wall. You will find the low pressure service port valve just before the fire wall.
Make sure you don't over charge the system, add small amount at a time and check the temperature every 3 min to 5 min by placing the A/C on max with the engine at 2000 RPM.
Once the temperature coming out of the vents are cold as ice with the engine at 2000 RPM. stop charging. So turn the recharge valve on for 20 seconds and then off then rev the engine to 2000 RPM for 3 min and check the temperature at the vent.
Once the temperature is ice cold, stop and don't over charge the system. Over charging the system will cause the A/C compressor to shut down and at worst break, causing a $500.00 repair cost.
Good luck and thank you for using fixya.
Open the hood of your 1998 Chevy Malibu and locate the brake fluid reservoir. On a 1998 Malibu, it's located on the driver's side closest to the front windshield. Open the reservoir tank and place the cap in a safe place where it won't get lost. Fill it to the fill line and not above then replace the cap and your done. Now you need to figure out where the brake fluid is going since this is a closed system and if it is low then your brakes are getting worn and more fluid is accumulating in the lines due to more travel of the brake cyclinders or you have a leak. The master cylinder should look like this picture, if you find this helpful, a vote with the thumbs up would be appreciated
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