Operation CHARM: Car repair manuals for everyone.
Home >> Mazda >> 2003 >> MX-5 Miata L4-1.8L DOHC >> Repair and Diagnosis >> Heating and Air Conditioning >> Evaporator Temperature Sensor / Switch >> Testing and Inspection
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

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.
- 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.







11. Inspect the voltage as shown.
If not as specified, replace the thermoswitch. (See COOLING UNIT DISASSEMBLY/ASSEMBLY.)
pro multis · About Operation CHARM