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I am not judging you please understand ,as not all are car people so to speak , but do you keep an eye on things under the hood ? ...I bet the heater woes are due to low coolant level, and if you don't check the coolant on occasion you likely have overheated the car at some point or 2 and have a head gasket or intake gasket(both known sore spots on gm engines) leaking .low coolant level will cause intermittant heat and cold air from heater and eventually all cold air,..also if you left the coolant go too low , and if that is the reason for the heater trouble as I suspect , you would overheat the engine without knowing it as the level would be too low to turn on the dummy light or register hot on the gauge because the sensor needs the coolant to send a signal , in turn precipitating gasket issues.---maintenance may well be a factor here.Report it
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