Question about 2000 Pontiac Bonneville

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Hot air comes out driver side, but cold air comes out of the passenger side

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Interesting that it blows cold on one side and not the other. The guy I had recharge it only put one can in. This is the fist recharge since i've had the car (its a 2000 i purchased in 2004), i think i'll get a hose myself and put one more can in.
What pressure is recommended? i could not find this anywhere (or perhaps did not search hard enough :))

Posted on May 21, 2010

  • JMysl May 21, 2010


    Sorry, did not mean to post this as a solution!

    interesting that it blows cold on one side and not the other. The guy I had recharge it only put one can in. This is the fist recharge since i've had the car (its a 2000 i purchased in 2004), i think i'll get a hose myself and put one more can in.
    What pressure is recommended? i could not find this anywhere (or perhaps did not search hard enough :))



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My 2000 Bonneville would do that when the pressure in the ac system was low. I had a leak in my system and bought a recharge kit and charged it when it got low. The correct way is to fix the leak of course, but this worked for me for the last 8 months until I had it fixed this week.

Posted on Mar 07, 2010

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  • JMysl May 19, 2010

    I just had my 2000 Bonneville's A/C recharged (to about 30 psi), because it was always hot, but now it having the same symptoms (hot on driver's side, cold on passenger's). Does this mean it needs one more can? The retired mechanic I was working with thought it had to do with the electronics and the baffles not working properly.

    Also, if you close the vents on the driver's side, the temp of the passenger's side went up.

  • swampthang90
    swampthang90 May 21, 2010

    if your system was low, then it has a leak. I had to put a can in my car once a week. A recharge kit costs about $20 bucks, and you can find cans of freon for $5 - $8. You should probably either have it fixed, or buy this recharge kit and keep the pressure up.

  • swampthang90
    swampthang90 May 21, 2010

    As the pressure drops, it will first stop blowing cold on the drivers side, then when the pressure gets low enough, it will finally shut off the compressor completely and blow no cold air. When it stops blowing cold on the drivers side, put a can of freon in it.

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Posted on Jan 02, 2017

roniecon
  • 6826 Answers

SOURCE: 1999 pontiac grand prix gtp dual airconditioning

Two things can be the problem,first,try adding ,a little freon,if it is low,it will only cool one side,then if this does not help,there is a door actuator motor that controls this,it could be not working,the dash has to come out to replace this actuator motor,if this was at all helpful,please rate,thank you.

Posted on Jul 13, 2010

Molson02536
  • 3854 Answers

SOURCE: 2000 pontiac montana air conditioner driver side

That is correct, the air blend door actuator. "flapper valve" may need to be replaced or cleaned and free from binding up. Good luck and hope this helps. If there is an Auto Zone in your area, they can order the part you need and give you the step by step instructions to removing the old actuator and replacing it if it's damaged. Good luck and keep me posted, be glad to help. 

Posted on Aug 22, 2009

  • 1 Answer

SOURCE: air conditioning

On a w body car with a single temp adjustment control (not a dual zone) your problem should be a low refrigerant charge. Due to the design of this evaporator, a low refrigerant charge will cause the furthest areas from the inlet and outlet hoses (the drivers side) to not remove the heat from the incoming air. This allows the air on the drivers side to be outside temp but refrigerated on the passenger side. In cars with Dual Zone controls you must not only verify the refrigerant charge level, but also check the mode doors which control the air flow and regulate the temp. To check the refrigerant level do not use pressure gauges alone. Verify a proper charge level by checking the temperature of the two aluminum lines going in to the firewall of the vehicle. With the A/C set to high the temperatures should be within 5 degrees of each other. If not, then there is a charge issue. I hope this helps

Posted on Jul 30, 2008

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