2012 SONIC ENGINE DIAGRAM CODE
This is due to the fact that the ECM has detected a large enough difference in temperature between the ECT and RCT to conclude that coolant flow is too low, so it switches the radiator fans to high to prevent engine overheating Diagnose the P00B7 Chevy Cruze trouble code When a P00B7 Chevy Cruze trouble code sets, you may notice that the radiator fans are running at high speed at all times when the engine is running. Symptoms of P00B7 Chevy Cruze trouble code Do not replace the thermostat as “routine” service when changing the engine coolant. If there are no thermostat related trouble codes and the engine coolant is at the proper level, do NOT replace the thermostat. By itself, that is NOT a reason to replace the thermostat. IMPORTANT: These smaller engines may take longer to reach normal operating temperature. The ECM monitors the thermostat every time you start the engine and compares the ECT readings to the RCT readings to ensure the thermostat is operating within design parameters. NOTE: GM recommends you DO NOT replace the engine coolant thermostat unless you find a thermostat related trouble code. The ECM makes the determination whether pellet heating should be done by the engine coolant or by the heater, depending on load conditions The thermostat should be fully open at 243☏. When 12V current is applied, the thermostat begins to open at 176☏. When operating properly, the thermostat begins to open with by itself when engine coolant reaches 217☏. The pulsed current is determined by the ECM. The wax in the pellet can be heated by the engine coolant OR, by applying a pulsed current to the heater located inside the pellet. The newer electric thermostats are designed to fix that problem.
2012 SONIC ENGINE DIAGRAM FULL
So car makers added a heater to the wax pellet to force it to open faster to allow full coolant flow and prevent overheating. Traditional wax pellet thermostats are slow to respond to temperature change in the engine coolant. As a result, the engine doesn’t reach full operating temperature as quickly and may not provide enough passenger compartment heat. In addition, short trip driving and low heat generation by the engine may prevent the thermostat from opening as quickly. Because the engines are smaller, they may not generate the same amount of heat at idle as a larger or older engine. To get the power of a larger engine, but with increased MPG. Electric thermostat and housing used on small engines