Question about 2004 Buick Century

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The vehicle is 2004 buick century. sometimes the temp guage rises and comes back down. during this time, clod air blows. sometimes the temp guage is 1/2 way and cold air blows. thermostat has been changed. I am not loosing cooland. why is this happening?.

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  • guy r gobind
    guy r gobind Feb 10, 2014

    how long will it take for a response? just asking

  • Bob MacDonald
    Bob MacDonald Feb 10, 2014

    Did you check to ensure you installed the correct thermostat? Is it a factory/OEM t-stat, or aftermarket? Are you using factory/OEM-advised coolant?

  • guy r gobind
    guy r gobind Feb 12, 2014

    the thermostat is from gm dealer and the coolant is DEX-Cool, Orange in color.

  • guy r gobind
    guy r gobind Feb 12, 2014

    Add a Commentometines the overflo tank is full. Some

  • guy r gobind
    guy r gobind Feb 12, 2014

    sometimes the hose from the t/stat to the rad (top right hand facing the car) is hard and hot and sometimes is is cool and soft. Took it to a shop and $600 LATER, THE PROBLEM IS NOT SOLVED



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Is your electric fans running constantly. and most times then not you`ll need a water temp sensor or water temp relay. usually the temp sensor on that model comes usually next to the thermostat with a little wired plug on top. or on the radiator. either way pull the plug while the motor is cold. unscrew the sensor and screw the new one in and replace the electric plug back on top of the sensor. 2 things: Cold motor, have every thing set up and ready because when you take out the sensor the coolant will start to come out. you will not loose much if you work quick. keep rags or paper towels below the sensor to keep coolant off the motor and smelling when it gets hot. you have also pour or hose off coolant after your done installing the new coolant temp sensor.

Posted on Mar 21, 2014


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Posted on Jan 02, 2017

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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

  • 108 Answers

SOURCE: blowing cold air via the heater

Assuming that none of the Electrical/Electronic controls were disturbed when changing the Thermostat it seems to me that you have an "Air Lock" within the heater. One must purge all the air out of the cooling system as close to the highest point as possible after the system has been partially or fully drained. Most of the time one will find small BRASS Bleeder Valves located somewhere near the highest point. Open each one while the system is pressurized and let Air escape until some Coolant escapes. Sometimes it may be necessary to loosen a Heater Hose and bleed the air at that point. Remember that the system MUST BE PRESSURIZED to accomplish the Bleeding of Air. Many auto parts stores sell hand pumps with a pressure gauge for this purpose and leak testing. These pumps typically replace the Radiator Pressure Cap temporarily. The system does not have to be at normal operating temperature to bleed the air out. Once the Air has been bled you will have to refill the radiator to normal full and make sure that the Coolant Recovery Tank level is also brought up to recommended level. A quick check is to remove the Radiator Pressure Cap, Start the Engine, Rev the engine suddenly (A short Jab) and see if the coolant level falls rapidly in the radiator. If it does it is definitely an AIR LOCK situation.

Fastest Robe

Posted on Nov 19, 2009

Testimonial: "Thank you, I'll do the quick jab test to determine the air lock and proceed with bleeding"

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SOURCE: 2000 buick century, where is the thermostat

The thermostat is in a housing on the engine. It's located where the lower radiator hose attaches to the engine. The coolant level should be right near the top of the radiator when you remove the cap, and the overflow canister should be filled to the indicated line (there are markings on the canister). If your gauge stays on cold, you may have a faulty coolant temperature sensor. If it will get to normal operating temperature while sitting still, but starts cooling down when you drive, you have a thermostat failure - it's stuck open, and will need replacement.

Posted on Dec 11, 2009

Testimonial: "thank you for your quick response. hopefully i can now correct the problem."

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