Question about 2003 Oldsmobile Alero

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No heat when car is moving - 2003 Oldsmobile Alero

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Your thermostat is stuck open and any amount of air movement over the radiator takes away all the available heat.

Make sure your radiator fan isnt stuck on as well.

If you sit at idle the car does make heat....ok not the fan then.

Put a piece of cardboard over the face of the radiator and drive and see if it fixes the problem. If it does...replace your thermostat! Oh and be sure to remove the cardboard before you do any long range driving!

Good luck and be safe!

Posted on Dec 12, 2009

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This usually is due to the fact that the antifreeze/water mixture isn't right, when you are sitting there is more heat being produced and being circulated through the heater core, but when moving the cold air is cooling the radiator and the mixture is not proper so the liquid is not staying hot long enough and by the time it reaches the heater core it has cooled down a lot. The proper mixture for your antifreeze is 50/50 with water, Another thing is if this isn't mixed properly and you get a cold snap if there is to much water it can freeze causing a cracked engine and also damage other parts, You need to pick up a antifreeze tester at any local Auto Store or take it to a local garage and have them test it, And if necessary have the flush out the radiator and put a fresh mixture in.

Posted on Dec 12, 2009


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If you need further help, I’m available over the phone at

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