Question about 2000 Pontiac Bonneville

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2000 pontiac bonneville blows hot and cold at the same time

Temperature doesn't seems to stay where you want it. It will drift warmer or colder. Also it sometimes blows hot and cold at the same time. In 2 different locations. The other day I had it set mid range temp and blowing defrost and floor. ac compressor not on. And cool air coming out of defrost and hot heat coming out of the floor vents. Anybody have a thought? Thanks for any help and for taking the time to read my question.

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  • Pontiac Master
  • 9,742 Answers

Sounds like the blend door motor isn't working.

Posted on Dec 06, 2014

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6 Suggested Answers

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Posted on Jan 02, 2017

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dgjtex
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SOURCE: 2004 Pontiac Montana blows cold air in defrost

There is a mix damper inside your duct that controls the heat over heater core and ac evaporator that to your floor and one to your defrost. it is probable an electric actuator, that is not functioning properly. If yu can locate it and manually move it, you might have to remove the actuator motor first, you should be able to figure out your problem, I hope this helps! merry Christmas!

Posted on Dec 22, 2008

garydillon
  • 42 Answers

SOURCE: ac vent problem

Damper/flap for driver's side is probably stuck. Try moving the selector from cold to hot several times. Also, move the recirc/outside air control if the previous doesn't work.

Posted on Jun 02, 2009

  • 72 Answers

SOURCE: grand prix 3800 blowing only hot air please help

check the temp control switch in the dash

Posted on Jun 22, 2009

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

Zeevert
  • 373 Answers

SOURCE: 2001 pontiac bonneville AC just stop blowing air.

It sounds like your blower motor has died. This is pretty common for older Bonnevilles. I have a 2005 Bonny and replaced mine last year after 75,000 miles.
But first check your cabin filter. You may or may not have one. If you do, and it gets plugged up, you will get very low air flow. I had an Impala that get plugged with a mouse nest. If it's like mine, open the hood, and above the firewall on the passenger side and below the passenger wiper, is a cover labeled "air filtration system". It has a couple clips, remove it and look inside. It will be very obvious if you have a cabin filter. (I didn't have one) If there is no filter, you should be able to look down in the hole and see the white fan blades about 10-12 inches down. They should be spinning if the blower is on.
zeevert_4.jpg Not spinning? Next you should check the fuses. The fuses are probably under the back seat, but check your owner's manual.




zeevert_3.jpg If fuse looks OK. It's probably the blower fan.
The fan is under the dash on the passenger side... just about where the passengers left toe would be.
Remove the panel under the dash; probably a couple 7mm screws.
Unplug the fan. The center wire should have 12+volts.
Remove the rubber vent hose... kinda on the back of the motor.
Remove 3 screws. Probably 7mm. And the blower should come out.
I know my blower is different than yours, but they pretty much look the same.


zeevert_5.jpg

Posted on Nov 16, 2010

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Need to reset blent door actuater on 2000 ponyiac bonnevile


I never heard about a need to "reset" a blend door.
Are you trying to fix a condition where the passenger side blows hot or cold, but opposite the temperature of the driver side?

If a/c, you probably need some Freon recharge. If heat, check your coolant level.
My 2005 Bonneville had this problem with the a/c. I looked at the blend doors for hours, before getting a clue about the low Freon.

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