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if the thermostat is faulty it will show up as two things
the car will overheat within 5 minutes of start up (10 minutes max) as it will be stuck closed and prevent coolant circulation
and second it will be stuck open which will be seen as taking a long time to reach normal operating temp which will be a long time if ever in cold weather and very low ambient temperatures
you call it as a thermostat sensor where it is a coolant temperature sensor which is a different unit
the sensor in this case reads the engine coolant temp and reports to the ECM so that correct air /fuel ratio can be maintained under all conditions
It also reports that the coolant temperature is too high and so the ECM turns on the fan/s to cool the radiator
They cost from around $20.00 to $80.00 ud depending on make of car , generic or genuine
natural for engine temp to rise in Traffic - Until Themostat opens ) cooling fan sensor kicks on fan . But Antifreeze is not just a Cold weather item . Coolant is Absolutely Necessary for Hot Days . You must be full to recovery bottle setting of cold when checked prior to start up . Coolant for your make / model is Reddish - Pink colour and should have a reading of -25 thats negative 25 degrees the Lower the Better even - 50 .. Why ?? - 50 is 50 %% antifreeze / Coolant Concentrate MIX Gives Hot weather cooling Ability or very cold weather starting / winter HEAT .
change the thermostat, sounds like it could stuck open and wont allow the engine reach operating temp, also test the constant control relay module located to the right of the battery as your facing the front of the car, also test coolant temp switch it might be defective and producing a high voltage that would cause the fans to constantly operate no matter the temp. Hope this helps
Just saw your second posting, so the temp is still above normal. Could the sensor that controls the fan be not reading the heat properly ? The antifreeze/coolant issue could still be relevant, so I will re-post that info. Tho. Electric cooling fans will sometimes come on after a vehicle is parked, (It actually heats up when stopped), but not when it is rolling down the road because the movement is applying some cooling effect to the engine. \ If the engine is not actually overheating, then the fans may be working normally. Also, make sure your water/antifreeze mix is correct by using a specific gravity tester. It is a tube with 4 or 5 balls, some of which will float to give you a reading. Contrary to popular belief, More is not better when it comes to antifreeze/coolant. It needs water to work properly. Too strong a mix will actually make your vehicle run cold so that the temp sensors and heater will not function properly. The engine will not achieve proper operating temperature and may actually damage some of the components by running it cold, affect timing, spark, etc. This could also cause the symptoms you describe. The engine would not actually reach the proper heat threshold until you added the extra demand of the AC heat transfer. But the first criteria would be whether the engine is actually overheating / or in normal range . It may be that the colder weather is allowing the sensors to come on a little later, warming the engine and heater components a bit more than they would in warmer weather. Would be good to know what the actual coolant temp is. Could check that with a guage, and also check to see what temp thermostat you are using. 195 degrees in the winter would be better, 165/180 or so in the warmer months
Sure the engine coolant will be warmer than the outside temperture and if the car has been sitting a long time in cold weather and the outside temperture warms up it could be the other way around. The coolant temperture sensers aren't real accurate as they are a relaitive senser beween hot and cold and the numbers reported don't have to be real just the change from hot to cold and the reching of the coolant to the operating temperture. Noe it the senser doesn't read the opertating temperture coprrectly you'll have all kinds of problems. The therostaste will try to set the temperture of the water to it's set temperture and can open or close completly to get 195 degrees F. Many times if it's too cold then the stat is bad and needs to be replaced This shows up in alot of cars first thing after winter and the first onset of cold weather when the daily tempertures vary the most from day to night.
It is possible that your thermostat is stuck open. Normally, the thermostat remains closed when starting cold, confining coolant to the engine block and cylinder head until it heats up. Once the coolant in the block is warm (usually within 10 minutes), the thermostat begins to open and let coolant flow into the radiator to cool it down some. A properly operating thermostat will continue to cycle until the coolant reaches the operating temperature of the thermostat--usually around 180 deg F. Then the thermostat will continue to adjust its opening to maintain that temp.
Thermostats can get stuck in both closed and open positions. When stuck closed, the engine will quickly overheat. When stuck open, the engine will take forever to warm up--especially in cold weather because the coolant is continually pushed into the radiator and cooled off before it ever has a chance to get warm. Changing the inexpensive thermostat may help correct your condition.
Could be a problem with your intake air temp sensor or your coolant temp sensor. The most likely would be the coolant temp sensor. It may be reading cold and will make it run good as the engine is cold but as it warms it is not adjusting the air fuel ration to the proper levels making it run rough hot
flush the radiator and cooling system and refill with fresh coolant and distilled water. i know during extreme cold temps, it will take a while but try some good maintenance and see if the situation improves. happy new year
when diving in cold weather fans take longer to cut in due to cold air going through radiator will keep temp down,once stationary the cold air is not being forced through and the engine coolant temp will rise