For 1990-2009 cars

### Removal Procedure

1. Relieve the pressure in the coolant reservoir by turning the coolant reservoir cap slightly counterclockwise.

Warning: Refer to Battery Disconnect Warning in the Preface section.

2. Disconnect the negative battery.
3. Remove the variable intake system (VIS) vacuum tank. Refer to Intake Manifold Tuning Valve Vacuum Reservoir Replacement.
4. Disconnect the engine coolant temperature (ECT) sensor connector.
5. Remove the ECT sensor from the cylinder head.

### Installation Procedure

1. Coat the threads of the ECT sensor with sealer.

Caution: Refer to Fastener Caution in the Preface section.

2. Install the ECT sensor and tighten to 17 N·m (13 lb ft).
3. Connect the ECT connector.
4. Install the VIS vacuum tank using the VIS vacuum tank retaining bolts and tighten to 8 N·m (71 lb in). Refer to Intake Manifold Tuning Valve Vacuum Reservoir Replacement.
5. Connect the negative battery cable.
6. Fill the coolant system.