Air only blows out the defrost vent

Tiny
RONALD FRANKLIN
  • MEMBER
  • 1999 OLDSMOBILE 88
  • 3.8L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 114 MILES
I followed your advice on replacing the A/C compressor. It is working great. I have a problem now, the cold air only blows out the defrost vent no matter what I set the control on. Any help would be greatly appreciated. Thanks again
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Saturday, July 15th, 2017 AT 2:46 PM

6 Replies

Tiny
STEVE W.
  • EXPERT
This is the anniversary edition correct? Does it have the automatic or manual control system. They are slightly different. But the most common issue is a broken vacuum line or bad vacuum control from the control head.
If it is a bad vacuum actuator the heater box has to come out to get to it. That means the instrument panel has to come out, the AC and heater system has to be drained and discharged, then you can get to the controls that are on top of the HVAC module behind the dash.
It is a real bear to do so I hope the issue is a line.
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Saturday, July 15th, 2017 AT 3:32 PM
Tiny
RONALD FRANKLIN
  • MEMBER
Thanks Steve. I removed the glove-box and found a white plastic arm that was broken looks like it was connected to a small metal rod with ridges on the left and a plastic lever on the right and yes it is an anniversary edition.
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Saturday, July 15th, 2017 AT 3:48 PM
Tiny
KEN
  • ADMIN
Hello,

Yep that is the controller that adjusts the temperature and air flow or the system. Use must fix the arm or replace the unit.

Please let us know what happens.

Cheers, Ken
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Monday, July 17th, 2017 AT 11:42 AM
Tiny
STEVE W.
  • EXPERT
As Ken said, that is a linkage arm. The ridges are basically to lock the plastic on. Set the temperature to full cold, now move the arm until you get full cold air and the door stops. That is the point you clip the two parts together. If they have fallen apart (usually because of the age of the plastic) you can use a couple small zip ties or even thin wire to hold them together.
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Monday, July 17th, 2017 AT 12:50 PM
Tiny
RONALD FRANKLIN
  • MEMBER
Sorry to keep bothering y'all but the plastic box on the right does not want to move freely it acts like something is keeping it from moving thanks guys
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Tuesday, July 18th, 2017 AT 4:52 PM
Tiny
KEN
  • ADMIN
Can you please take a picture and upload it so we can see what you are talking about?
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Wednesday, July 19th, 2017 AT 10:53 AM

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