why would coolant be 1/2 way up? it should be always full in the radiator. Just top it off, let the car warm up, and top it off again, make sure u get all air out. You could have an air pocket in heater core.
Probably a semi clog heater core too. Disconnect the 2 heater core hoses, and Stick a Gardening water hose into the heater core hose alternately and flush it out.
If you have compressed air, it would work even better.
Last edited by steak59; 09-30-2011 at 10:18 PM.