Question about 1990 Buick Century

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1994 Century Buick Heating problem

My 1994 Century Buicks heater just blow COLD air, I flushed the system, changed the theromstat, went through all the hoses & radiator(all clear) and I still get NO hot air from the heater. Now the temperature gauge goes up and down, if I'm going slow, temp rises past normal range, then back down when I speed up. When just idleing it seems to run in the normal range, with or without the radiator cap on. HELP or I will shot it!! Thank you.

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  • tonylype Nov 07, 2008

    I am having the same problem with my 1991 Century. I just flushed the heater core to verify coolant flow through it. I can feel water flow through the heater hoses when the engine is running. When I move the temperature lever between hot and cold, I can hear the door moving and feel the air flow rate change slightly. I am currently trying to find out if there is a heater control valve that makes the coolant bypass the heater core.

  • mikes10333 Feb 13, 2009

    I am having same problems with 1994 Buick La sabra. I changed thermostat bled the thermostat housing. I get cold air sometimes hot then it will Chang back to cold then hot back and forth.

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It sound like you have a block or plug up heater.If you just used a garden hose that is not a flush .A reel flush is called a power flush it used about 150lb. of air&water mix. Find a Radiator shop to do this. as far as your temp. going up and down you may have an air trap in eng,an radiator run car for 20min without the cap on. I have been doing Radiator work over 34 years

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How do you get the radiator cap off of 1994 buick century

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Did you make sure you got it full of coolent? i am saying this because if you don't it will create an air pocket in the system and it will not throw any heat until you get the air out. on some models there are relief valves either on the thermostate housing or buy the water pump to do this. all that needs to be done is to start car and let it run a few minutes to get warm and open the valve and let the air excape whenyou see a steady flow of coolent close valve and you should have it.

Posted on Jan 07, 2009

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