If it isn’t, there’s likely an issue with the thermostat itself. Check the Coolant TemperatureĪs a further step, the mechanic may check the coolant temperature at the thermostat housing to see if it’s responding correctly. If you pinch your hose, stay aware of the belted accessories and the fan. If it is easy to pinch the hose, the engine coolant will typically flow through it. Squeeze the Thermostat HoseĪ mechanic will check under the hood where your Cobalt’s radiator hose meets the thermostat housing. If you feel little to no heat from the heater, it’s a good indication that the thermostat is the problem and not a wiring issue. Is the Heat Blowing Hot?Īn excellent way to at least get a good idea of whether it’s the thermostat or the sensor is to start the car cold and let it idle for ten minutes. If there are codes related to the ECT, such as P0117 or P0118, they indicate that the Engine Coolant Temp Sensor is not performing correctly, which means you should start diagnosing P0128 in your Chevy Cobalt by taking a look at the ECT and wiring. If you feel the heater isn’t working well, that is the easiest way to tell the thermostat is stuck open. It can be challenging to tell this in a vehicle that doesn’t have a temperature gauge.
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