Vehicle is overheating Heat only works when parked and idling. Water Pump thermostat and cooling sensor on engine was replaced. Vehicle looses pressure when driving coolant is leaking but no visible external leaks when parked
What makes this problem better or worse?
Nothing
How long has your 2005 Chevrolet Cobalt had this problem?
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I'd start by ensuring your cooling system has no air pockets within it. Air pockets can prevent heat in your vehicle and can cause an overheating condition also. As you have replaced all these components (for unknown reason?), it is likely there are still air pockets that must be (safely) purged.
Since I don't know what necessitated replacing those parts in the first place, I cannot speak to what else may be going on. Obviously a hands on evaluation by a skilled technician is a strong advantage.
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