Heater core on a 2003 Chevrolet pickup 4 wheel drive crew cab

Dec 23, 2008

-   I have the same simptons. No real heat. I replaced my thermostst & anti-freeze also, and that didn't fix anything. I finally flush the hearter core and anti-freeze came out black in color, and it heated for about 3 days. I now flush the heater core every 3 to 4 days to get heat, after that, I get cold air again. -   Guest

Nov 23, 2008

-   I have a chevy s10, two wheel drive with A/C. The heat went out on the coldest week in Tennessee. The thermostat has been changed and the radiator has been flushed and new antifreeze installed. I checked the hoses coming to the heater core from the water pump to the return to the engine block, the hose from the pump is full of antifreeze and the hose from the core to the engine block is DRY. I think that the heater core is gone and I am still not receiving any heat to the cab. Is there a switch that I'm missing? And what can I also check before I begin removing the heater core?-   raymills1