Question about 1990 Chevrolet Crew Cab

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

How do I get to the heater core on a 2003 Chevrolet pickup 4 wheel drive crew cab?

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  • raymills1 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?

  • Anonymous 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.

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If you have air conditioning you will need to take it to a garage and recover the r134, you will need to remove the dash to allow you to remove the heater box, it's an ugly job, I've done a dozen or so and can do it in about 6 hours now, the first time it was closer to 11 hrs, good luck

Posted on May 15, 2008

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I'm in need of a fuel tank for a s- 10 chevy pickup. 4 wheel drive. 6 cylinder crew cab. it broke. any suggestions would help.


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Have you checked your coolant? if coolant is low it can cause an air pocket in heater core and it wont pass out until rpm's increase by the extra flow of water pump. if it is full then might wanna try removing heater hoses and back flushing heater core with water might have a little trash in it restricting flow.

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