Vacuum Pump?

Tiny
TOMAS DOHRNER
  • MEMBER
  • 2005 FORD TAURUS
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
Following your vacuum down, with low side open at gauge and coupling. Yellow house attached to vacuum pump. When I run the pump, the gauge will only go to 6-inch hg. Any suggestions as to why I am not pull 29–30-inch hg. Thanks. I am a 78 old retired automotive engineer.
Wednesday, April 16th, 2025 AT 4:51 PM

3 Replies

Tiny
STEVE W.
  • MECHANIC
  • 15,233 POSTS
Sounds like you are working on the A/C. Unable to pull a vacuum would be a leak. What was the reason for pulling it down originally?
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Wednesday, April 16th, 2025 AT 7:58 PM
Tiny
TOMAS DOHRNER
  • MEMBER
  • 2 POSTS
New FS 10 Compressor, Accumulator, Orifice tube, Oil and O-rings.
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Thursday, April 17th, 2025 AT 11:46 AM
Tiny
STEVE W.
  • MECHANIC
  • 15,233 POSTS
System worked until the compressor failed? I suspect you have tested the vac pump itself to be sure it can pull a vacuum? If you have access to CO2, dump some into it and use plain soapy water to check those parts for leaks. That way you don't need to start over. I would check over the cores as well, wouldn't be the first time I saw a core that was failing under vacuum but could hold pressure. If you wanted to you could also test by isolating the parts and pull them down as a test. You don't need to pull it all the way down then, just enough that you are sure the cores are not the problem.
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Thursday, April 17th, 2025 AT 1:47 PM

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