Question about 2000 GMC New Sierra 1500

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87 gmc truck

How do you replace the heater coil for a 1987 GMC Sierra Classic

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  • jstaffbd Nov 18, 2009

    thank you for the help



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I assume your referring to the heater core. Its a pretty straight forward process. As always I recommend getting the factory service manual or at least a haynes manual if your gonna perform repairs on your vehicle. That way you have an extensive guide with step by step illustrated instructions.
You can get the haynes manual for quite cheap. Here is the link as well as some basic instructions.

  1. Step 1 Drain the engine coolant from the cooling system. Use a clean container, if you believe you can use the coolant again, although replacing it with fresh coolant may be best. Crawl under the GMC Sierra, remove the drain plug from the radiator, let the coolant flow into your container and then replace the plug.
  2. Step 2 Raise the hood and take off the Sierra's negative battery cable. Disconnect the heater hoses from the core. Remove the temperature control cable and mode control cable from the heater case assembly.
  3. Step 3 Disconnect the instrument panel carrier that provides access to the heater case assembly. Undo all electrical connectors that could interfere with removing the case assembly.
  4. Step 4 Remove the case assembly by disconnecting the assembly-to-chassis screws/nuts. Extract the heater core from the case by removing the core cover screws.
  5. Step 5 Install the replacement heater core to the heater case and reconnect the case to the chassis, tightening all screws.
  6. Step 6 Reconnect all electrical connectors that you detached. Reinstall the instrument panel carrier, mode and temperature control cables to the case assembly and the heater hoses to the core.
  7. Step 7 Put the negative cable back on the battery and refill the engine cooling system. Let the engine run to normal operating temperature and check for leaks in the system.
Hope this helps.
Thank you,

Posted on Nov 17, 2009


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