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Which is the AC vaccum hose? Been searching all day

Tiny
HANDNSUMBOI21
  • MEMBER
  • 1998 BUICK REGAL
  • 127,000 MILES
Its only blowing on the floor and defrost
Monday, April 2nd, 2012 AT 1:44 AM

7 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Look for the vacuum line on the engine side that goes through the firewall. The info I looked at was automatic hvac.
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Monday, April 2nd, 2012 AT 4:09 PM
Tiny
HANDNSUMBOI21
  • MEMBER
  • 14 POSTS
Ok well the ac was blowing cold on the floor and defrost but the front vents was hot, I found the vacuum door actuator so I'm thinking I should replace it but before I pay money for it I wanna know if that sounds like the problem to you? Ac blows cold on floor and defrost but front vents be hot.
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Monday, April 2nd, 2012 AT 4:34 PM
Tiny
JDL
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Is there vacuum going to the actuator, engine running? If so and the actuator does move, maybe faulty actuator?
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Monday, April 2nd, 2012 AT 4:51 PM
Tiny
HANDNSUMBOI21
  • MEMBER
  • 14 POSTS
I was going to replace the one that's in the glove box, but the vacuum hose under the hood its really hard to tell which is which even with a diagram
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Monday, April 2nd, 2012 AT 5:03 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Usually there is only one vacuum line that goes through the firewall. Look for a vacuum tee on the firewall. I'd have to look at it. Just find anything that has a vacuum line and follow the line. Your cruise control may have a vacuum line, your map sensor, Your fuel pressure regulator probably has a vacuum line. The throttle-body may have vacuum lines going to it.
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Monday, April 2nd, 2012 AT 6:30 PM
Tiny
HANDNSUMBOI21
  • MEMBER
  • 14 POSTS
So am I looking for that 1 line that has the leak are all of them? I see so many but the problem is so small I'm trying not to have to go and pay an arm in a leg for a small problem, I apreciate the help.
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Monday, April 2nd, 2012 AT 6:50 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
If you can move it between floor and defrost, the vacuum may be ok? I can't see much from here.
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Monday, April 2nd, 2012 AT 7:01 PM

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