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Break free 2 bolts on thermostat housing, loosen hose going into housing and clamp, it will leak some antifreeze. Once the housing is taken off block clean off old gasket material from both surfaces. The block and housing, be careful not to scratch the surfaces. No sharp pointy objects, aluminum is soft. Then take the old thermostat out and put in the new one. Put gasket in place ,align housing and put , bolts in by hand first, so it doesn't cross thread. Just snug bolts and top off system with antifreeze . Start engine ,put on heat and run until thermostat opens. Check for leaks, tighten bolts 1/4 turn should be fine. Add antifreeze in overflow bottle if needed.
The speedometer sensor is located on the top of the transmission. It is
held on by one bolt. Remove the bolt and gently pull and turn the
speedometer sensor and the whole assembly will come out of your
Park your Honda Prelude on a level surface, activate the emergency brake and place blocks behind the back tires for safety. Disconnect the negative battery cable with a terminal puller.
Raise the vehicle on the side of the wheel speed sensor's location. Remove the wheel and tire assemblies.
Disconnect the sensor electrical connection from the wiring harness.
Take note of the connection location for the sensor retainers, grommets and clips. You will need to know this information for the installation process.
Start at the connector end of the sensor cable and remove grommets, clips and retainers in order to free the harness.
Unscrew the sensor mounting bolt and remove the sensor from the differential housing.
Install the new speed sensor by reversing the removal process. Loosely secure the sensor and sensor harness connection in place, taking precaution to keep the harness from twisting or bending. Once in place, torque the sensor mounting bolt to 16 foot pounds (22 Nm). Tighten any bracket bolts to 84 inch pounds (10 Nm).
Lower the vehicle safely and reconnect the negative battery cable. Refer to your owner's manual to perform an ABS system check to confirm that you installed the sensor properly.