GM Grand Am/Achieva/Calais/Skylark/Somerset 1985-98

Vacuum Modulator

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See Figures 1, 2 and 3

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Fig. Fig. 1: Vacuum Modulator and hose routing detail-3.1L engines



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Fig. Fig. 2: Vacuum Modulator and hose routing detail-2.4L engines



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Fig. Fig. 3: Vacuum Modulator mounting detail

  1. Disconnect the negative battery cable for safety purposes.
  2.  
  3. Disconnect the vacuum line from the modulator.
  4.  
  5. Remove the vacuum modulator bolt and retainer.
  6.  
  7. Carefully remove the vacuum modulator from the transaxle.
  8.  

When removing the vacuum modulator, be careful the modulator valve does not fall from the transaxle case.

To install:
  1. Using a new O-ring, install the modulator into the transaxle case.
  2.  
  3. Install the retainer and bolt, and tighten to 15-20 ft. lbs. (20-27 Nm).
  4.  
  5. Connect the vacuum line to the modulator.
  6.  
  7. Connect the negative battery cable and check for proper operation.
  8.  

 
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