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Message: <blockquote data-quote="RBHAutomotive" data-source="post: 1439339" data-attributes="member: 312155">Your heater core is fed from a coolant bypass that does just that.  It bypasses the thermostat.  Most likely you have something failing such as the water pump, or a clogged radiator.  The car will start to overheat when at idle due to low coolant flow.  When you start driving not only are you turning the pump faster and flowing an acceptable amount of coolant but you are pushing more air through the radiator.  You need to verify that the high speed fan is coming on when the car starts to get hot.  You should be able to hear it turn on from the front of the vehicle.  Get this taken care of before doing much more driving!  Overheating will blow head gaskets and destroy engines!  It's far cheaper to repair this now.Cheers</blockquote>