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A/C issue?

Tiny
DERRICK WEST
  • MEMBER
  • 1998 CHEVROLET LUMINA
  • 3.1L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 167,000 MILES
My Air conditioner when engaged will blow through the vents then stop and start blowing through the floor vents then stop and blow through the vents off and on. Was told it may be the solenoid. Then someone else said it may be the vacuum pump. Grasping at straws!
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Saturday, June 17th, 2023 AT 9:27 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,289 POSTS
Hi,

The mode door actuator is controlled by engine vacuum. Under the dash on the passenger side, you will see an electric vacuum solenoid and vacuum hoses will run to different actuators. (See pic below)

I have a question. I need you to pay attention to when this happens. Does it happen when you are going up a hill or when the engine is under a heavy load?

Let me know. Also, take a look under the dash to see if any hoses are leaking, disconnected, or damaged. Also, with the engine running, you may hear a hissing sound if there is a leak. See if you hear anything.

Let me know.

Joe

See pic below.
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Saturday, June 17th, 2023 AT 10:42 PM

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