Question about Pontiac Bonneville

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Yr 2000 ac not cooling on drivers side blows warm to cool air on drivers side and cold air on pass. side freeon checks good antifreeze checks good

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  • osb2 Aug 12, 2008

    yr 2000 pontiac bonneville ac not cooling on drivers side. blows warm air on drivers side and cold air on pass. side. freon checks good. anitfreeze checks good.

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1. Low freon. A mechanic once told me that the car will act like this when it needs a freon recharge. Such did not solve my problem, however. 2. Stuck door. There is supposedly a "door" (for want of a better term) inside the heating/cooling system that regulates temperature and/or cabin airflow. The door opens and closes according to the temperature and and dual climate settings selected. If this door gets stuck, it causes hot to blow out drivers side and cool on the passenger side. I am suspicious of this theory. Why would hot air correctly blow out of both sides? I had another mechanic tell me this one. 3. temperature sensor improperly reset. I read online that if the battery gets disconnected and reconnected improperly, it will cause a malfunction in the sensor responible for delivering the proper temp through the a/c system. The solutions posted were disconnect the battery and reconnect with negative terminal first; check all fuses that reference climate control, a/c , heater, etc in manual, remove for 15 seconds, reinsert or replace if necessary. This did nothing for me. However, I personally associate this intermittent problem with a battery reset. My wife's car has electrical problems (don't get me started) which necessitate frequent battery replacement. Everytime the battery has been disconnected, the problem starts again. 4. Computer malfunction. I also read that the problem may stem from the climate control interface itself (i.e. the thing with all of the temperature knobs and buttons). Replacing this is supposed to fix the problem. I have not tried this, and frankly, I refuse to do so. The only current solution I have ever found is patience. The problem seems to simply disappear after a while (albeit a long while). My wife and I both have Intrigues (Gasp!). They both have the same problem(s). Nothing works for either. Good luck. If you have success post your results.

Posted on Aug 12, 2008

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Hi,

The blower under the dash has two sides vents/flaps (for the driver's side and the passenger's side). These flaps are either controlled electrically using solenoid actuators or vacuum valves. Either which pulls or pushes a mechanical linkage that do the actual opening & closing. Well it is really moving the vents to blow air through the heater core or through the evaporator. Having said this, then possible problem could be:

  • detached/disconnected linkages;
  • stuck flaps/vents;
  • vacuum leak/no electrical power to solenoid/actuators;
  • blocked vent/port from evaporator leading to driver side.
A bit of work since you have to either bring the dashboard off or work lying on the floor.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Aug 12, 2008

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Door air selector leaks or its moving cable needs adjustment to close completely when select either cold or hot air inlet to cabinet.

Posted on Aug 11, 2008

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In the GM service manual...there is a listing that goes like this:

"Is the drivers side several degrees warmer than then passenger side? If so, system is low on freon. But not low enough to set codes.

Posted on Aug 02, 2008

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Check that there is nothing obstructing the air door on driver side. Check for hose not connected.

Posted on Aug 02, 2008

  • Ginko
    Ginko Aug 11, 2008

    Inspect AC lines carefully, if you do not find any problem, double check if freon need recharge, sometimes it goes undetected.

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