Question about 1998 Cadillac DeVille

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Heater core replacement. Haynes manual and car have major differences.

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  • yadayada
    yadayada May 19, 2011

    Get a factory manual or download one at this address



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Heater core is removed from inside the cabin. About a two hour job. The hardest part is removing the hoses in the engine bay.
In the cabin, remove the beauty panel under the glovebox; remove the glovebox, and move the HVAC controller. The heater housing, or cover is held with two screws, and the core is held with one screw (clamp).
Remove the HVAC module assembly. Refer to HVAC Module Assembly Replacement.
Remove the HVAC filter cover.
Remove the heater core/evaporator tube seals from the module.
Remove the heater core cover screws (1).
Remove the heater core retaining screws (1).
Remove the heater core retaining straps.
Remove the heater core.
Remove the rubber seals from the inlet/outlet pipes of the heater core.

Installation Procedure

Install rubber seals to the outlet/inlet pipes of the heater core.
Install the heater core to the module.
Install the heater core retaining straps.

Install the heater core retaining screws (1).
Install the heater core cover.

Install the heater core cover screws (1).

Install the heater core/evaporator tube seal from the module.
Install the HVAC filter cover.
Install the HVAC module assembly. Refer to HVAC Module Assembly Replacement.

This is the best that I can do for you, hope this works

Posted on May 19, 2011


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