Testing the thermostat is difficult, as it may work most of the time, but sticks intermittently. Read more: Engine coolant temperature sensor: how it works, symptoms, problems, testing. The resistance across the sensor terminals should change with the temperature according to the chart that you can find in a factory service manual. Without a scan tool, the engine temperature sensor can be tested with an ohmmeter. We would still recommend having the vehicle checked out. In general, this is not a huge problem, although it might affect the gas mileage. If the vehicle runs well, the coolant level is OK, there is enough heat and no other driveability problems, it's possible that the thermostat is sticking intermittently. Air conditioner and (or) temperature gauge stops working and (or) after the Check Engine light comes on (GM). Engine temperature drops when driving on the highway, especially in cold weather Engine takes too long to warm up in cold weather With the code P0128 there could be no symptoms at all, or any of the following: Often this code causes the Check Engine light to come on and off in cold temperatures. Steps to diagnoseīelow Thermostat Regulating Temperature means that the engine does not reach expected temperature after running for sufficient time, or in other words, it takes too long to warm up. Signs of automatic transmission problems.How to check the engine when buying a used car.How to get the best deal on a used car?. ![]() Buying a Used Car: 10 Common Mistakes to Avoid.
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