1. Autos
Send to a Friend via Email

Your suggestion is on its way!

An email with a link to:

http://autorepair.about.com/od/regularmaintenance/ss/AC-recharge_5.htm

was emailed to:

Thanks for sharing About.com with others!

How To Recharge Your Air Conditioner with Freon

By

5 of 10

Locating Your Low Pressure Port
Use the low (not high) pressure port.

Locate the low pressure port, that's where your action will be.

photo by Matt Wright, 2008
Your air conditioning system has two "sides" -- a low pressure and a high pressure side, depending on where you are in relation to the compressor. You'll be recharging your AC through the low pressure port. You should consult your owner's manual to be sure, but your vehicle will have a cap over the pressure ports. One cap is labeled "H" (for high pressure) and the other is labeled "L" for low. As a further safety measure, the ports are different sizes so you physically cannot attach the pressure gauge or hose to the wrong port! It's pretty failsafe, but always double check yourself to be sure.
  1. About.com
  2. Autos
  3. Auto Repair
  4. Regular Maintenance
  5. Help, My AC is Blowing Warm

©2014 About.com. All rights reserved.