Question about 1990 Buick Century

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Car still overheating after i put in coolent

I put Coolent into my 1990 buick, but now my temp light keeps coming on. it seems that just after a few minutes, the temp gauge goes into the red. I do not understand it. I put the coolent in the container that says Coolent for engine. did i do something wrong? Please help!

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  • mallory_bari May 27, 2009

    i added it because the light came on and told me the coolent was low. so yeah i guess i am losing coolent. what do i do?

  • mallory_bari Jun 01, 2009




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First, disconnect your negative battery terminal for 3-5 minutes, this will clear out any old code readings. Re-attach the neg battery cable, start the car and let the car idle until the problem re occurs. If you have a bad thermostat, then lower radiator hose will be significantly cooler then the upper radiator hose. This is because the thermostat has become locked in the closed position and is not allowing coolant to travel through the motor and back to the lower radiator hose. Also, if you do replace your thermostat, make sure to buy a thermostat rated for 1090 or 190, don't use a 180 rating. Using a hemostat with a different rating, can cause other components of the cooling system to work improperly, refer to your owner’s manual or a Haynes/Chilton manual to be absolutely certain.

Posted on May 28, 2009

  • christoph535 May 29, 2009

    If you are losing coolant, you need to find the source of where your leak(s) are coming from. Try placing a large piece of cardboard under your car at the end of your day. The following morning, observe where the leak has soiled the cardboard. This will give you and idea of where in the leak is coming from. Also, if you know, check both of your radiator hoses, heater hoses connections, water pump seal and damp or wet areas on all sides of the exterior surface of the radiator. Replace any hoses that are dry, cracked, swollen or have very little recourse when squeezing them. Do these checks when the engine is COOL!


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No you did not do something wrong. This sounds like a issue with the thermostat and you should replace it. This could be your cause.. Are you loosing coolant? Is that why you added it?

Posted on May 27, 2009


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