Question about 2006 Buick LaCrosse

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No Heat My 2006 LaCrosse is not giving out any heat. I have replaced the heater core, the water pump, and the thermostat. It always seems to work until the next time the car is started. It was taken to a radiator shop today, and the radiator was flushed in case there was an air bubble. It worked - until I started it 2 hours later. It was blowing COLD air - colder than the outside air, so I assume it was the AC (even though it was set to 90 degrees). Why would it work for a minute every time someone works on it, then not work when I start it? (I know I'm cursed, but I doubt I need a witch doctor for my car.)

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It Sounds Like You Have Either A Faulty Heater control Valve Or On The High Side A Bad ATC (Automatic Temperature Control). Check The Hoses That Go Into The Heater Core Both Should Be Hot At Normal Operating Temp. If The Outlet side Is cold Or Luke Warm You Have A Bad HCV.

Posted on Apr 23, 2013


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SOURCE: 2005 Buick rendezvous heater blowing cold and temperature gauge not working properly?

Faulty coolant temperature sensor and a faulty heater control valve.

Posted on Jan 14, 2012

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I changed the thermostat but it still does not heat up what else could be wrong

Heater needs Heater Core, Heater control valve, air diverter inside the car and hot water in the heater core. If you just change the thermostat you must have had a reason. If the car was running hot it could be a radiator clog. If the core is clogged no heat. If the heater core was drained when you changed the Tstat there may be air in it - if so no heat. If the control valve (on the heater hose) does not shift- no heat. If the diverter door in under the dash does not direct the fan air through the heater core- no heat.

Jan 03, 2016 | Cars & Trucks

1 Answer

Had no heat, although blower works fine. Replaced thermostat, and had to replace water pump, due to bolt shearing off. Still, have no heat.

Last step is to flush the heater core. After that, replace the heater core. You need a manual, because you have to remove the dash.

Dec 30, 2015 | 2006 Jeep Commander 5.7

1 Answer

What should the temperature of the heater core inlet hose be?

heater hoses run from the rear of the block to the water pump. One hose into the heater should be hotter than the other because heat is transferred in the heater in the car. . The cooling system draws water from the bottom of the radiator ( water pump inlet)which is always cooler than the top hose and dispenses it throughout the engine and heads including the heater core. It is then pushed past the thermostat with all the heat from the engine to the top of the radiator where it is cooled down by the air passing through the radiator . Check that the air vent for the cabin is set to recirculated cabin air and not fresh air from the outside as it will require recirculated air to increase in temperature to work properly

Nov 14, 2014 | 2006 Pontiac Grand Prix

1 Answer

2006 buick lacrosse heater core change


Oct 24, 2014 | 2006 Buick LaCrosse

1 Answer

Very low heat coming into the cabin.

I would think at some point in the vehicles time life some one has added a stop leak(bars, penzoil) or pepper to plug some kind of leak. Doing a flush won't always clean system out and yes your heater core is plugged giving no heat. Unfortunately its not an easy replacement as the other post is correct, complete removal of dash to get to heater core assembly.

Nov 16, 2012 | 1998 Dodge Dakota

1 Answer

I have a 2001 Ford Taurus that after replacing the water pump I lost all heat. I replaced the thermostat and "burped" the air out of the system but still don't have heat any ideas what it could be

Bob,there still may be air in there........I always bleed the air from the heater hose line entering the water pump. There should be a connection about a foot or so above where it enters there.
Take that loose while engine is cool.
Have someone start the car while you hold it downward AWAY from the alternator,and you stay clear also of that belt.
If the fluid gushes out of that line,it should be getting thru your heater core.

Oct 18, 2011 | 2001 Ford Taurus

1 Answer

Had to replace water pump after replacing... heater blows hot air at first then after 8 to 10 seconds turns cool. before replacing water pump i always heard water running through heater core when...

You may have loosened or lost some material into the system while changing the pump and caused a blockage in the heater core. There could be a little coolant going through to warm up but not enough to continue supplying heat once the initial heat is drawn down.
Ideally a back flush through the heater core may take care of it. You should be able to find a kit to help with in an auto parts store.
Open the hood and look on the firewall of the car. There should be 2 rubber hoses going into the firewall and into the car. They will likely have spring clamps just like on the radiator hose. Remove both lines. Then get a hose and put it in one line and run the water until it comes out clear. Then do the same thing with the other side. Do this a couple of times. Then reconnect the 2 hoses ahd check the level of the radiator. Then start the car with the radiator cap off and wait a while for the thermostat to open and have the heater on so it will cycle through the whole system. Then top off as needed.

Jun 14, 2011 | 2006 Pontiac Grand Prix

4 Answers

2000 VW Beetle Overheating, Leaking Coolant, No Heat in Car

sounds like another plastic rad has bitten the dust,replace the rad or hose if its split and refill with antifreeze and see what happens ,if ok then good if not post here again for more advice

Mar 12, 2009 | 2000 Volkswagen Beetle

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