Recently flushed cooling system and changed thermostat. Engine comes up to temperature. I have run water through heater core to check for blockage. Heater door actuator is working properly. There is a little heat coming out when the heat is switched to the floor and the blower is on low. Any other changes will make it blow cold air. Any other ideas?
With the car idling put on glove and squeeze the upper radiator hose in your hand you should feel the surge of coolant if the water pump is working properly so if you do not feel this then it could be your water pump and also check to see when was last time the drive belt was changed
Sounds like you may have an air bubble trapped. Try loosening the radiator cap & running the engine at 1500 rpms till the thermstat opens & see if you can "burp" the air out. You may lose a little coolant this way. shut off car & recheck coolant in radiator and reservoir bottle. Just because reservoir is full, doesn't mean radiator is full.
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