<table id="tabla_autos">
 <thead>
    <tr>
        <th>Patente</th>
        <th>Color</th>
        <th>Stock</th>
    </tr>
 </thead>
<tbody>
    <tr id="1">
        <td>LJ5213</td>
        <td id="id_color">Azul</td>
        <td>10</td>
    </tr>

    <tr id="2">
        <td>JK5123</td>
        <td id="id_color" >Amarillo</td><!-- color a reemplazar-->
        <td>15</td>
    </tr>

    <tr id="3">
        <td>YH512</td>
        <td id="id_color">cafe</td>
        <td>23</td>
    </tr>
    <tr id="3">
        <td>FD6521</td>
        <td id="id_color">Amarillo</td><!-- color a reemplazar-->
        <td>56</td>
    </tr>



</tbody>
</table>

$("#tabla_autos").find("tbody").find("td").each(function(){
   if ($(this).attr("id") == "id_color") {
   $("#id_color").text("Naranjo");
  }
});