03 altima heating problem

[hpaulb]

Replaced both the thermostat and termo controler. Removed and inspected the water pum. Flushed the rad, heater core and block. Same problem. Intermitant heat. After topping up the rad every day for 2 weeks, it seems better but still it will run warm then cold air. Seems to not have enough movement from the pump? What the heck is going on.

[Eikon]

Are you sure you bled it properly? Sounds like you might have some air pockets impeding flow.

[elwesso]

does the engine warm up properly and all that fun stuff...? are you getting a good coolant temp reading from the coolant temp sensor? If so, im inclined to think that one of the heater mix doors isnt working properly.