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Old 03-02-2012, 11:38 PM   #1
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MY 99 buick is having problems with the distribution of the heated air to the vents, on the driver side the air flow is hot and weak, but on the passenger side the air flow is strong but cold, also on the display of the heater and airconditoning control panel, the temperature figure flashes. Is it the vacuum lines, or is it the control panel ??????
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Old 06-10-2012, 10:18 PM   #2
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Have same problem with 2000 Lesabre Custom. A friend suggested that there are actuator valves(electrical I think) that control the vent valves under the dash. They have to be checked and/or replaced.
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Old 06-10-2012, 11:04 PM   #3
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Had a similar problem with my Park Avenue last December, turned out the passenger side heater blend door actuator was bad.
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Old 06-11-2012, 08:28 AM   #4
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How expensive a fix is that? Is it a DIY thing?
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Old 06-11-2012, 09:09 AM   #5
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Old 06-11-2012, 09:30 AM   #6
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How expensive depends on which climate control system you have (Manual or Automatic). From what I've read, Manual has one temp actuator on the heater box behind the glove box. Automatic has two temp actuators, one on either side of the heater box.
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Old 06-11-2012, 10:49 AM   #7
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What exactly do these actuators do? Are they expensive?
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Old 06-11-2012, 11:13 AM   #8
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Quote:
Originally Posted by cswhd View Post
What exactly do these actuators do? Are they expensive?
They actuate a door inside the HVAC duct that determines air flow. I don't think they are overly expensive. The main concern is usually getting to them, since they are buried in the IP.
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