I have a 2005 Buick LaSabre. When I turn the heater on it blows cold air. Once I kept changing the knob from cold to hot and it finally started working but then it warmed up so I used the AC. When I tried to use the heater again it wouldn't work.It only blows cold air or just luke warm air.

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07 Tucson heater blowing cold air - Hyundai Forum - Hyundai ...

www.hyundaiforum.com > ... > Vehicle Line Up > Hyundai Tucson
Dec 16, 2009 - I have a 2007 Tucson, when you turn on the heater it only blows hot air... Join Date: May 2005 ... a low coolant level will exhibit the first stated symptoms of no heat/low heat at idle and increased heat at cruise due to an air ...

Denlors Auto Blog » Blog Archive » Car Heater Blows Cold ...

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Oct 10, 2009 - When a car heater blows cold air, there are several possibilities that should ...... On my Dodge Neon when I turn on the heat it blows out cold air.

Heater blows only cool air...even w/ defroster on : Buick ...

repairpal.com > Problems > Buick > LeSabre
... Cadillac, Chevrolet, Chrysler, Dodge, FIAT, Ford, Geo, GMC, Honda, Hummer,Hyundai, Infiniti, Isuzu, Jaguar ... I'll turn up the temp on the dual control to get heat,

Assuming the cooling system is full and there are no air pockets, are both heater hoses getting hot when the engine warms up ?
If so, it could be a blend door problem under the dash.

2008 Lacrosse

Condition: no heat.

Diag: Hot In and Out hoses radiator, hot in and out to Core which means fluid good and thermostat opening. Bled air out of thermostat.

Fix: while listening for click of BLEND DOOR ACTUATOR (Electric CONTROLS) I manual set temp cold to hot back and forth. HEAT now.

Reason: COVID from sitting almost two years due to not needing three cars commute (WFH) since COVID.
Guess they got stuck from sitting there. I kept telling everyone to "exercise" their cars every week or so by driving and not just starting them.

FIXED

For car running hot and overheating issues, I suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems: ----Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------This details will help.Thanks.

there should be a temperature door, but I don't know if there is a cable or if its electric. turn the temp knob, if it feels like it moves anything? I dont have a diagram here at home, but will monday/

hi, some cars have a HEATER FLAP. if not CLOSING then cold air will be blown in. LEAVE ENGINE OFF and check the lever and listen for the SLAP of the flap CLOSING. the control cable is faulty. or the ELECTRONIC HEATER CONTROL NOT WORKING or the HEATER RADIATOR (UNDER DASH is BLOCKED). or AIR in SYSTEM. needs bleeding. gerry

You have a broken wire connection between the temperature control knob and the circuit board behind the center dash console. Vibration causes the failure and once the control knob gets loose the solder connection fails.

For someone that knows how to remove the dash unit and can re-solder a couple of new wires this fix should take no more than 1 hour. Make sure that you apply loctite to the heat control knob spindle nut when you re-assemble it.

The dealer quoted me 750 dollars to fix this issue and I found out that it's a common failure for this year. I fixed mine virtually for free but it took some tools and about an hour of my time.

In many cars there is a flapper valve in the ductwork which is sometimes vacuum actuated.If this flapper is stuck or the vacuum line is unhooked or deteriorated,you will not feel any warm air at the vents.Look under the dash for rubber vacuum lines or try moving the selector knob for HOT/COLD or FEET/VENT/DEFROST while revving engine alittle to increase vacuum.

Try spinning the knob real fast in either direction. Sounds stupid but it worked for me.