GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 40850  Size: SH
  1. Disconnect the negative battery cable. Refer to

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

    in General Information.
  2. Open the radiator pressure cap in order to release any residual pressure.
  3. Drain enough coolant into a suitable container in order to prevent leakage at the crossover.
  4. Disconnect the Alarmstat® electrical connector.

  5. Object Number: 40851  Size: SH
  6. Remove the Alarmstat® from the coolant crossover.

Installation Procedure


    Object Number: 40851  Size: SH
  1. Install the Alarmstat® in the coolant crossover.

  2. Object Number: 40850  Size: SH
  3. Connect the Alarmstat® electrical connector.
  4. Fill the cooling system to the appropriate level.
  5. Connect the negative battery cable.