In general, the hose should be barely warm until the thermostat opens.The first thing you should do is check to see how hot the coolant temperature is when the coolant starts flowing through the radiator hose, to the thermostat.Keep in mind that diagnostic methods and measures can vary from mechanic to mechanic, but overall there will be a certain set of steps that each mechanic should be following to assess this specific trouble code: There are a series of logical steps that a mechanic will take to properly diagnose and confirm a P0128 trouble code. If you notice either of the symptoms when testing or test-driving a vehicle, this may be an indication or validation of a P0128 trouble code. The car takes too long to warm up or you notice that the temperature gauge does not go up as high as it used to.The heater is not being hot enough, due to the coolant temperature in the engine being low.There are two common symptoms that will occur with a vehicle is you are experiencing a P0128 trouble code: Also Read: Why Is My Temperature Gauge Not Going Up? Symptoms Both or either of these issues could cause a P0128 trouble code to occur. The second most probable cause is that the genuine coolant temperature sensor or the wiring connected with the sensor is faulty or damaged. The absolutely most common cause is that the engine coolant thermostat has gotten stuck open or is operating prematurely. There are several common issues that can cause a P0128 trouble code:
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