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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 2 (Engine Heating And 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 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. 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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