Circuit/System Verification
WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
- Verify the condition does not exist:Incorrect fluid level or condition - Refer to:Loss of Coolant
- If a condition exists
Repair or replace as necessary.
- Go to next step: If no condition exists
- If a condition exists
- Verify there are no DTCs set related to the following system/component:
- B34 Engine Coolant Temperature Sensor
- { If equipped }B203 Radiator Coolant Temperature Sensor
- { If equipped }E41 Engine Coolant Thermostat Heater
- { If equipped }Q74 Engine Coolant Bypass Valve
- If a related DTC is set
- Go to next step: If a related DTC is not set
- Perform the scan tool control function: Engine Coolant Thermostat Heater and Cooling Fan
- Engine Coolant Thermostat Heater - 100%
- Cooling Fan - 90%
- Engine Speed - 1, 800 to 2, 200 RPM
- Verify the scan tool parameter: ECT Sensor = Less than 85°C (185°F) - Within 5 min
- If 85°C (185°F) or warmer
Refer to: Circuit/System Testing
- Go to next step: If colder than 85°C (185°F)
- Perform the scan tool control function: Engine Coolant Thermostat Heater and Cooling Fan
- Engine Coolant Thermostat Heater - 0%
- Cooling Fan - 0%
- Engine Speed - 1, 800 to 2, 200 RPM
- Verify the scan tool parameter: ECT Sensor = Greater than 102°C (215°F) - Within 5 min
- If 102°C (215°F) or colder
Test or replace the component: E41 Engine Coolant Thermostat Heater
- Go to next step: If warmer than 102°C (215°F)
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Verify the DTC does not set.
- If the DTC sets
Refer to: Circuit/System Testing
- Go to next step: If the DTC does not set
- If the DTC sets
- All OK.