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You need to check your heater core, and blower this are the most probable causes When you flush the coolant on this car, you are supposed to remove the thermostat first-another fine GM concept. IF the there is no volume blowing through the vents, it is a problem with the blower system, not the cooling system. IF it isn't hot but blows okay, it is the cooling system. There is a bleed procedure in this motor as well to remove air pockets. I'd try a t-stat first.

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Q: Your heater is not working in your 2000 Malibu you flushed your radiator but that didn't work what next How do you change the thermostat if necessary?
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