A/C refrigerant leaks at fill port

Tiny
TECH2020
  • MEMBER
  • 2009 FORD F-150
  • V8
  • AUTOMATIC
  • 120,000 MILES
Hi,

My stepson replaced the A/C Refrigerant Liquid Hose in his truck listed above as he stated it was bad. He charged the system via connecting to the port on the new hose (metal line). The A/C worked for a short time then he found the refrigerant leaked at the filling port. He replaced the hose (metal line) with a new Motorcraft part and the same failure happened again. Is he doing something wrong or is this a common problem? What to do?

My stepson has done extensive auto repairs.

Thanks,
Tom
Tuesday, October 19th, 2021 AT 6:02 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,864 POSTS
They all leak a little. The purpose of the valve stem is to hold the refrigerant in long enough to give you time to screw on the cap. There's a rubber o-ring inside the cap that does the real sealing.

Here's links to some related articles for the benefit of others researching this topic:

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

https://www.2carpros.com/articles/air-conditioner-leak-detection

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon
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Tuesday, October 19th, 2021 AT 6:39 PM

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