Last post on Nov 30, 2013 at 9:59 AM
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Buick LaCrosse, Heating / Cooling, Sedan
#13 of 31 Heater isn't working
Jan 30, 2009 (4:07 pm)
I have a 2005 Buick LaCrosse. Last night when I got into the car the heater would not blow any air. It would not work withthe AC either. On highway speeds you can feel a tiny amount of air from the defrost vents. However it is 2 degrees in Illinois and my tows were numb last night. Please help. I would lie to fix this myself if it is something a novice could do. Possibly the blower motor? Where is it located?
#14 of 31 LaCrosse air conditioning button
Dec 07, 2009 (5:16 pm)
I recently purchased an 05 LaCrosse and it seems that no matter what button I press (be it fan only, heat, defrost, etc.) the A/C button comes on. How do I get the A/C to not come on ?
#15 of 31 Re: LaCrosse air conditioning button [ceejay7]
Dec 08, 2009 (5:18 am)
Have you read the owner's manual on operating the HVAC?
When the AC turns on per settings, it's probably turned off by pushing the AC button and the light will go off. In defrost the compressor will be turned on always down to the ambient shutoff of about 50 deg. F.
Having the AC turn on is not a negative. It reduces humidity in the air and reheats it with the heater core to give a more comfortable system. When the outside temp is below 50 deg. F. the compressor does not turn on, so the AC is not actually cooling the air (50 is colder than it could cool it anyhow).
#16 of 31 2010 LaCrosse Heating/Cooling Problems
Sep 23, 2010 (6:15 pm)
#17 of 31 2010 LaCrosse Heating/Cooling Problems
Sep 23, 2010 (6:15 pm)
My 2010 LaCrosse intermitantly blows cold air when the controls are set to manual (air conditioning off), no recirculation and air to blow out the vents. It will blow very cold air for a minute or so and then go back to the outside air temp. It will periodically repeat itself. I have taken it to the dealer twice and they say "It is operating Normally." I know that is not true. Has any had similar experiances? Any solutions?
#18 of 31 Re: 2010 LaCrosse Heating/Cooling Problems [fotschto]
Oct 03, 2010 (5:25 am)
Not sure exactly what you are saying.
You've put it in a manual mode.
You've pushed a button or something telling the A/C pump to not engage.
You still get cold air as if the pump is running.
Does that sound right?
If you are in a defog or defrost mode it generally overides the A/C off switch. If outside temp is near freezing the pump will not engage.
Can you hear the click that occurs when the pump engages and disengages? That is have you verified the pump is actually running?
#19 of 31 Re: 2010 LaCrosse Heating/Cooling Problems [fotschto]
Oct 03, 2010 (5:59 am)
The previous post is right.
In defrost and some defog settings with floor air and windshield air the compressor is enabled if the ambient temps are warm enough. There is a cutoff, possibly about 50 degrees for the compressor being able to run in other modes asking for AC cooling. But in defroster / defog mix it may be lower.
Your next step is to open the hood when the outside temps are above 50 and start the car with the heater settings where you're getting the cold blast. Then go to the front of the car and look to see if the center hub of the compressor is turning with the belt pulley or if it's disengaged.
Also you can touch the metal freon tube going to the condenser unit that's in front of the radiator. One of those tubes will be hot if the AC compressor is running. The other silver tube will be cool. They may have plastic coating over them to help insulate, so they may not be silver/aluminum color.
If the tube is hot you know the compressor is cooling.
It's possible there is an intentional short term engagement of the compressor when the car is set for vents under the conditions you describe. It may be to circulate freon in winter months to keep the seals oiled with the lubricant so they don't dry and shrink.
Good luck. Tell us what you find when you test out the system.
#20 of 31 Heater Core Quick Disconnect Tool?
Oct 04, 2010 (7:54 am)
I am looking for source of part number and manufacturer of the heater core quick disconnect tool. The Buick LaCrosse ('10~'11MY) uses the quick connect to secure the heater core pipes to the coolant hoses. I believe there is a service disconnect kit/tool out there, possibly made by SPX/OTC or Mac Tool.
This plastic disconnect kit/tool for LaCrosse has got to be larger than that OTC 6046 which is the tool to remove the conventional quick connects used in the GM trucks. The 6046 is too small to go on the Buick version.
If anyone knows, please advise. Thank you.
#21 of 31 Re: Heater Core Quick Disconnect Tool? [jlim1]
Oct 05, 2010 (3:54 am)
Have you tried NAPA?
Why are you wanting to do a disconnect on a vehicle that is so new?
Also Rock Auto and GM Parts Direct may be sources if you have a part number. But carefully read the rules of GM Parts Direct.
You may also try ordering it through the dealer's part center. If it is a special tool, they likely order theirs direct from who made them for GM.
#22 of 31 AC Compressor
May 03, 2011 (6:30 pm)
Buick LaCrosse 2010
AC Compressor is on all the time even when you turn off the AC button on the dash. Is this normal for the compressor all the time?