low pressure port

2005 MERCURY MONTEGO
60,000 MILES • 6 CYL • FWD • AUTOMATIC
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BUYDOSA
  • MEMBER
  • 1 POST
how do I recognize the ac low pressure port from the high pressure port? Where are they?
Oct 28, 2009 at 2:28 PM
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STRAILER
  • ASE Certified Mechanic
  • 54,837 POSTS
  • ASE Certified Mechanic
The high side port is smaller around than the high side. Here is a guide and some diagrams to help you get the job done.

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon

and

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

and

https://www.2carpros.com/articles/how-a-car-air-conditioner-works

The low side port is on the tube or hose that comes from the firewall and goes to the compressor.

Please let us know if you need anything else to get the problem fixed.

Cheers, Ken
Sep 7, 2017 at 2:19 PM
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