MX-5 Miata Mazdaspeed L4-1.8L DOHC Turbo (2004)
Evaporator Temperature Sensor / Switch: Testing and Inspection
THERMOSWITCH INSPECTION
To Determine if The Switch is Functioning
1. Remove the glove compartment.
2. Start the engine.
3. Turn the A/C switch on.
4. Turn the fan switch on.
5. Connect the positive (+) and negative (-) probes of the voltmeter to terminal A and terminal B of the thermoswitch respectively. (The wiring
harness connector must be connected to the thermoswitch connector.)
6. Inspect the voltage as shown.
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If not as specified, inspect on/off points of the thermoswitch.
To Inspect On/Off Points of the Thermoswitch
1. Disconnect the negative battery cable.
2. Remove the cooling unit. (See COOLING UNIT REMOVAL/INSTALLATION.)
3. Remove the thermoswitch (See COOLING UNIT DISASSEMBLY/ASSEMBLY.)
4. Connect the negative battery cable.
5. Connect the thermoswitch connector to the wiring harness connector.
6. Turn the ignition switch to ON position.
7. Turn the A/C switch on.
8. Turn the fan switch on.
9. Immerse the sensor part of thermoswitch in a container of ice water.
10. Connect the positive (+) and negative (-) probes of the voltmeter to terminal A and terminal B of the thermoswitch respectively.
