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A/C not accepting Freon

Tiny
DANIEL.WILSON1
  • MEMBER
  • 1995 NISSAN TRUCK
  • 2.4L
  • 4 CYL
  • 2WD
  • MANUAL
  • 66,000 MILES
I replaced my low pressure line, because it was cracked at the elbow. I hooked up the vacuum and manifold and vacuumed it down to around 30 in of mercury. I cranked the truck and turned on the a/c. However, when I opened up the valve to let the freon in, it only flowed for a second and stopped flowing. The compressor kicked on and the pressure built to 40 PSI on the low side and around 50 PSI on the high, but it only sucked out about 4oz of Freon (freon can setting on a digital scale) and wont take any more.

Why would it only take 4oz and stop?
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Sunday, January 31st, 2021 AT 6:55 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

It could be the schrader valve on the line that is not allowing Freon to flow.

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

The valve is like a tire valve for filling your tires. It is simple to change after you remove the Freon and there is nothing in the system.

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

Roy
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Sunday, January 31st, 2021 AT 2:15 PM

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