Where is the check valve located?

2000 FORD F-250
230,000 MILES • 5.4L • V8 • 4WD • AUTOMATIC
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MBFOR99
  • MEMBER
  • 46 POSTS
Okay, my normally the A/C works great, but when I go into acceleration it goes to default which is defrost then comes back. Now I have that new valve but for the life of me I cannot find the location of that check valve. If you guys know where the valve may be located, please let me know. Thanks, Matt
Apr 2, 2022 at 12:17 PM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 POSTS
Hi,

As you are aware, the HVAC is vacuum controlled. There could be a leak at any point in the system causing the vacuum to drop and the airflow to change direction.

When you say check valve, I'm not 100% sure what you are referring to. So, I attached a pic below showing the vacuum schematic for the system. Take a look through it and let me know the specific name of the component you are referring to. Once you let me know, I can locate it for you.

Take care,

Joe

See pic below.
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Apr 2, 2022 at 10:01 PM
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