idling? The dealer topped up the coolant and now the heater works properly. However, they could not tell me why the coolant was low. My warranty expires April 2010 so if this is a major issue I want them to fix it before that. They said it could be air trapped in the hose that will work itself out?????????? Someone told me it could be a blown head gasket?! Since I am not mechanical how should I proceed? I have already had other issues with this car!