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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 17 (Engine Cooling System) >> Diagnostic Information and Procedures >> Coolant Heater Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

The coolant heater cord will read Open due to an internal thermal switch if the ambient temperature is above -18°C (0°F).

  1. Ignition OFF, disconnect the coolant heater cord from the E19 Coolant Heater.
  2. Test for 30 - 40 Ω between the terminals of the E19 Coolant Heater.
    • If not within 30 - 40 Ω 

      Replace the E19 Coolant Heater.

    • Go to next step: If within 30 - 40 Ω 
  3. Test for infinite resistance between each terminal of the E19 Coolant Heater and ground.
    • If less than infinite resistance 

      Replace the E19 Coolant Heater.

    • Go to next step: If infinite resistance 
  4. Test for less than 2 Ω between the engine coolant heater cord plug and the engine coolant heater cord connector for each circuit.
    • If greater than 2 Ω 

      Replace the engine coolant heater cord.

    • Go to next step: If less than 2 Ω 

      Go to next step: All OK.

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