Question about 2003 Buick Century

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AC problems for a 2003 buick century

Blowing out hot air, but the gauge is reading 70

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Posted on Jan 02, 2017

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SOURCE: 2000 GMC Sierra 5.3 Litre, won't blow hot air

I experienced the same head ache. First attempt was to replace the thrmostat and after taking it apart I realized that there was nothing wrong with it. I then removed the plastic cover/panel located under the dash board on the passenger's side. (only a few 4-5 smalls screws) Removal will enable you to see the on/off switch/gate moving/rotating as you turn the knob to hot or cold positions, on the control panel. If that switch/gate seems to work ok, then the trouble is within the heater core. Many mechanincs suggested that I replace the heater core. A very expensive proposition.
I checked the heater core supply/intake hose and found it hot to the touch, while the return hose was nearly cold. It was definitely a heater core blockage. I removed both ends (supply and return) hose connections/clamps. They are located near the fire wall in the engine compartment. A special tool is very helpful to remove those clamps easily and to replace them as well. It can be done the old fashion way but this tool was a life saver and reduced work time to just minutes. (Tool is $70.00 bucks at auto parts store,so I borrowed mine from a mechanic/friend)
I then hooked up a garden hose to the return end of the heater core and reversed the flow of coolant/water through the heater core. My truck is a Sierra 2000 and I refuse to see how a heater core could get clogged up with clear coolant alone. To my surprise a flat piece of rubber about the size of a quarter blew out of it and the flow of water became unobstructed. I reconected the ends of the hoses to the heater core, replaced the lost antifreeze & everything returned back to normal. No money spent for something most mechanics suggested I replace control valves/switches ($280.00) replace heater core ($500.00) etc etc. I am glad I was curageous enough to tackle this myself and save a few pennies. Good luck, and I hope this will work for you.

Posted on Dec 02, 2008

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SOURCE: heater on 2003 Buick Century only works when the rpms are up

Your likely problem is low coolant level. Check to make certain that your coolant level is topped up in the radiator and that coolant is also in the reservoir at the appropraite level as shown when on container when the engine is hot or cold. When the coolant is low, you have to have higher RPMs to get the coolant to pump through the system and heater core.

Posted on Apr 05, 2009

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SOURCE: 2000 buick century blowing hot air on one side and

The temperature actuator has gone bad. You will need to replace and have it recalibrated. You could try and disconnect the battery for a few hours and see if it will reset it's self. But you will be in the same boat before too long. And will eventually need to replace it.

Posted on Jul 01, 2009

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SOURCE: 2003 buick lesabre AC problem

You have to find the motor that controls the blend door and open it manually to find out which one is bad there are 3 blend doors on the HV/AC system one will be where the heater core is. The other will be between the vented air and AC? heating system then the third door will operate vents in dash and defrost condition. If you have someone operate them AC system heating system and watch the blend door motors, the one you find not moving will be the one that has the problem. They have vacuum and electrical motors, if it is a acuum motor you can move the door manually with your hand, if it's electric you will have to disconnect the rod by removing the pinch clip off of the rod.

Posted on Jul 10, 2009

  • 1 Answer

SOURCE: 1998 Buick Century Air Conditioner not blowing out cold air

My 98 Buick Century was doing the same thing. Up here is the north we have Canadian Tire. Went in there picked up a aircon recharge kit called RED TEC 12A hole kit costs $40 cnd I put 1 can in on the low pressure side which is the only fitting that the filler would fit on and now I have 33 degree air coming out of the drivers side and a couple degrees colder from passenger side.
I am sure you guys have something like Canadian tire down there you might even try Wallmart.

Posted on Aug 25, 2009

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1 Answer

1995 Buick Century blowing hot air.


A mechanic would check the system with a set of pressure gauges. If the compressor is running, the low side would read around 30psi and the high side would be around 250psi. That is how you know if the system is full of freon or not.
You may have to get a professional diagnosis to proceed. If you replace the compressor, the accumulator needs to be replaced and a vac pump is used to pull all of the air out before the freon is added.

May 07, 2013 | 1995 Buick Century

1 Answer

The ac vent blows out hot air on the drivers side ,and the passenger side vent blows out cold air what could cause this problem on my 2001 buick century


its probably the actuator. its usually located under the dash in the center. you might be able to get to it by removing the glove box and looking to the drivers side. its a black box that has a wire connector on it. switch your heater control from hot to cold and you should here it click. replace it and i bet your problem is solved

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My AC blows hot air out the driver's side and cold


My 02 Century has dual temp controls . One for driver for passenger. Make sure you don't have the dual climate enabled and just set for heat on your side and AC on the passengers

Apr 04, 2010 | 2001 Buick LeSabre

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Used 1998 Buick Century, missing -both- heater/ac door actuators


you can remove radio to get to them.disable air bags when working around dash.

Apr 24, 2009 | 1998 Buick Century

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Heater on 2003 Buick Century only works when the rpms are up


Your likely problem is low coolant level. Check to make certain that your coolant level is topped up in the radiator and that coolant is also in the reservoir at the appropraite level as shown when on container when the engine is hot or cold. When the coolant is low, you have to have higher RPMs to get the coolant to pump through the system and heater core.

Mar 24, 2009 | 2003 Buick Century

1 Answer

I just need to know where is the thermostat located on a 2003 bui


Fllow top radiator hose from radiator to engine, where hose clamps on engine is called a goose neck thermostat is under that, it will be held on with 2 bolts. are you sure you got all the air out of system when you chg. water pump? If you don't bleed all air out of system it will not blow hot, because of an air pocket in cooling system.

Mar 09, 2009 | 1999 Buick Century

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Heater blows cold air


is it wet on the pass side floor ??? your heater core is out.. hard to replace...

Jan 19, 2009 | 2003 Buick Century

1 Answer

Heater blowing cold air Buick Century 2000


does the car not heat up in general? Whats the temp gauge doing and how long of a ride have you tried this for?

Jan 04, 2009 | 2000 Buick Century

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