Haltech IG5 - Manual (Page 14)

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1.3.2. Coolant Temperature Sensor
The coolant temperature is used by the computer to determine the required corrections to
ignition timing.
The coolant temperature sensor has a solid brass temperature sensing tip. Refer to the
diagram for technical details of the sensor. The coolant sensor supplied is an industry
standard component and some engines may already have provision for this type of sensor.
The coolant temperature sensor is designed to screw into a threaded hole and protrude into the
engine coolant stream. For air-cooled engines, the sensor can be embedded directly into the
engine block or used to sense oil temperature.
Locate a suitable position on the engine which will allow the hole and thread to be machined,
and which gives access to the coolant stream. The sensor should be mounted before the
thermostat in the coolant circuit. Since most engines have existing temperature sensor holes,
it is often possible to mount the Haltech sensor in one of these holes. A thread adaptor is
sometimes necessary. In some engines only one temperature sensor hole exists and is used for
the dashboard gauge sender.
If it is necessary to drain the coolant from the vehicle to fit the temperature sensor then the
factory manual for the engine should be consulted for the correct procedure to restore the
coolant and purge the cooling system of air.
1.3.3. Inlet Air Temperature Sensor