Editing Z31/HVACReconditioning php (section)

==== Rebuild the heater box ====

https://dev.z31library.com/xenonzcar_archive/z31/images/Raredare1/hvac/heaterbox.jpg

* If necessary, replace the flap seals within the box.
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Remove the vacuum actuators from the right side of the box (see image below), including springs and vacuum manifold.

* Remove the vacuum actuators from the back side of the box, including wiring harness and sensor.
* Remove the six screws holding the two halves of the box together.
* Pull the box apart.
* Replace the internal flap seals.
* Scrape off all of the old seal.
* Sand the metal flaps with 220 grit wet-or-dry sandpaper.
* Repaint the flaps with spray enamel (Duplicolor high temperature cast aluminum engine enamel recommended).
* Replace the seals using open-cell foam weather stripping (3/8" wide x 3/16" tall).
* Lubricate all flap pivot points with a high-temp multipurpose grease.
* Reassemble the heater box.
* Replace all springs (optional, but recommended if springs are original).
* Lubricate all external pivot points with multipurpose grease.