1998 Buick Lesabre dash venting

Tiny
444FIRE
  • MEMBER
  • 1998 BUICK LESABRE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 75,000 MILES
Dash vents don't blow a/c @ start-up - blows onto windshield. 3-5 mins. A/c comes out dash vents. Why and how to fix. Thanks.
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Wednesday, February 24th, 2010 AT 8:17 AM

5 Replies

Tiny
DENNYP
  • EXPERT
Are you saying it is slow to switch from windshield to dash vents?
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Wednesday, February 24th, 2010 AT 10:59 PM
Tiny
444FIRE
  • MEMBER
Yep - very slow. When set on "auto" with temp @ 60 it doesn't blow out the dash vents, even when I manually direct it to "mid".
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Thursday, February 25th, 2010 AT 6:34 AM
Tiny
DENNYP
  • EXPERT
Air Delivery Improper
Step
Action
Yes
No

1
" Engine idling.
" Check for vacuum on the main vacuum supply source at the HVAC Programmer Vacuum Line Connector.
Is vacuum present?
Go to Step 2
Go to Step 5

2
Using a vacuum pump, apply vacuum to each actuator line at the HVAC Programmer Vacuum Line Connector.

Do all the lines hold vacuum?
Go to Step 3
Go to Step 4

3
Inspect the actuator doors for binding.

Did you find and correct the condition?
Go to Step 7
Go to Step 6

4
Inspect each vacuum line for an open or restriction, if no open or restriction was found replace the appropriate actuator.
Go to Step 7
--

5
Locate condition and restore vacuum to source line.
Go to Step 7
--

6
Replace the HVAC Programmer.
Go to Step 7
--

7
Operate the system in order to verify the repair.

Did you correct the condition?
System OK
--
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Thursday, February 25th, 2010 AT 1:36 PM
Tiny
444FIRE
  • MEMBER
Good info denny - where is the programmer vac line connectors located? How do I access them? Thanks.
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Friday, February 26th, 2010 AT 7:05 AM
Tiny
DENNYP
  • EXPERT
If I remember correctly, they are under the passenger side of dash.(Behind glove box)
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Friday, February 26th, 2010 AT 11:03 AM

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