![]() The thermostat in this car is working properly. At about 204☏ (96☌), the radiator fan comes on and the temperature drops a few degrees. As the thermostat opens and coolant starts flowing through the radiator, the temperature of the lower radiator rises quickly close to the temperature of the upper hose. In this Honda in the chart, the thermostat starts opening at about 185☏ (85☌). The thermostat opens at 185☏ (85☌) and the temperature of the lower radiator hose (blue line) becomes almost the same as the temperature of the upper radiator hose (red line). The yellow line is the engine temperature. The most common Check Engine light codes related to the thermostat are P0128 and P0126. In most cases, if the thermostat is stuck closed or open, the Check Engine light will come on. In modern cars, the operation of the thermostat is monitored by the engine computer (PCM). At the temperature marked on the thermostat, it would start opening. In the old days, testing of the thermostat involved removing and heating it while submerged in water. Read more: how to check the coolant level. When dealing with any cooling system problem, the coolant level is checked first. As we mentioned, one sign that the thermostat is stuck open (or missing) is when the engine temperature drops below normal when driving on the highway in cold weather. A heater may also not be as strong as in older cars with a larger engine. In many newer cars it takes up to 20-25 minutes of driving before you can get decent heat going in winter. In addition, newer technologies that reduce friction inside the engine also reduce the amount of heat generated by friction. This means they burn less fuel and as a result, produce less heat. Many late-model cars have smaller fuel-efficient engines. 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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