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Vacuum Modulator Inspection

WARNING: This page is about a different car, the 1994 Geo Tracker and 1993 Geo Tracker. However, it is still accessible from the selected car via links, so may be relevant.
  1. Raise and support vehicle. Remove vacuum hose from modulator. Remove modulator from transmission using Modulator Wrench (J-23100).
  2. Inspect modulator for fluid leakage. Replace vacuum modulator if any transmission fluid drains from modulator. With diaphragm rod in place, test for vacuum leakage by attaching vacuum pump to fitting on vacuum modulator. Apply 20 in. Hg of vacuum to modulator. If vacuum gauge on pump indicates a vacuum loss, replace vacuum modulator. Inspect vacuum modulator "O" ring for cuts and other damage. To install components, reverse removal procedure.
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