Question about 1990 Chevrolet Lumina

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Heater blows cold air from top vents after running for 1.3 hours

After an hour and twenty minutes of running the heater my car's heater begins to blow cold air out of the top vents and loses warmth out of the bottom vents. I still get warm air out of the bottom but the warmth can not compensate for the coldness on the upper vents. To maintain an adequate comfort level, I have to increase the car's temperature settings to 74* - 75* and fan speed. This action provides more heat temporarily solving the problem as warm air will blow out of both the top and bottom vents.
This only occurs after I am run the car for one hour and twenty minutes. When I first strat the car in the morning and after the engine wars 71*-72* degrees provide very a comfortable heat setting until I hit the 1 hour 20 minute mark, when cold air begins to blow out the top or the bottom vents loses it's warmth.

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Sounds like you may be able to fix it by flushing your antifreeze and back flushing the heater core. Some car owners cheep out and put stop leak into the antifreeze, others dont change there antifreeze at all. Both are mistakes.

Posted on Apr 25, 2009

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