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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 >> DTC P00B7, P0597-P0599, or P2181 - E41 Engine Coolant Thermostat Heater Malfunction >> Circuit/System Description

Circuit/System Description

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.

For an overview of the component/system, refer to:Cooling System Description and Operation 

Circuit Description
Ignition Supplied from a fuse.
Control The output circuit is switched to ground to activate the component.
The output is PWM controlled.
Component Description
E41 Engine Coolant Thermostat Heater The thermostat has a build-in heating resistor. When the resistor heats up, the thermostat opens more, resulting in a lower engine operating temperature.
The thermostat has a mechanical fail-safe in case of an electrical condition with the thermostat heater. The mechanical thermostat will open at approximately 103°C (217°F) and cycle between 105°C (221°F) and 110°C (230°F).
K20 Engine Control Module The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly.
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