Question about 2002 Chevrolet S-10

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How to install a new heater core in my 2002 Chevy S-10 pickup truck. Also, where is the best place to buy the part? Thank you. Kenny.

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  • ktomasian Sep 30, 2009

    I very much appreciate your detailed response. I was ready to ask for my money back before I received your solution.
    Hawaii Napa wants about $120 if I recall for a new one. I need to double check though.



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I always plan to take out the whole dash and I heard you might have to miss with the evaporator core for the ac, and the whole heater box. For that part, I'd might try getting a great bid on ebay, free shipping.

Posted on Sep 29, 2009

  • Richard Klein
    Richard Klein Sep 30, 2009

    1. Step 1

      the dashboard. The heater core in S10s is behind the main dashboard,
      and it must be removed to access the core. The front dash panel can be
      removed by unbolting several screws at the bottom of the panel, then
      pulling the panel away from the dash. Once this front panel is off, the
      primary dash can be unbolted from the firewall with four large bolts
      below the windshield. Several accessories may need to be taken out to
      unbolt the dash from the firewall, such as the radio or 4WD switches.

    2. Step 2

      the coolant from the core. There is a drain plug at the bottom right of
      the primary radiator that will empty the coolant system when unscrewed.
      Some residual coolant might remain in the core, but will come out when
      the core is taken out later.

    3. Step 3

      Uncouple the core from the coolant lines. These hoses
      are directly behind the oil filler tube, and will come loose when
      squeezed with pliers. They are of different sizes, and it won't be
      necessary to mark them for later re-attachment.

    4. Step 4

      the core from its mounts behind the removed dash panel. Several bolts
      might be difficult to reach, but once free from the mounts, the core
      assembly slides up and out towards the interior of the truck. Lay a
      towel down when removing the core, as come coolant might splash out.

    5. Step 5

      Insert the new heater core and bolt it into the mounts. The openings will fit into the holes provided in the firewall.

    6. Step 6

      Reconnect the heater core hoses, and re-attach the dashboard and front panel.

    7. Step 7

      the coolant system with a 50/50 mix of antifreeze and water. Tighten
      the drain plug on the radiator, then fill it. Crank the truck up with
      the heater system on its maximum setting, and continue to pour coolant
      into the radiator until it will not take in any more.

  • Richard Klein
    Richard Klein Sep 30, 2009

    I've been finding heater cores for about $45. How much are they were you live?



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