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What temp does fan come on - 2003 Cadillac CTS

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Cooling fans should start operating from 80degreesC depending on the sensor setting (70-85) for your vehicle . But the fan should be full on at 85 degrees C

Posted on Apr 19, 2014

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Posted on Jan 02, 2017

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My '11 Ranger 800 crew overheats. Fan start waits til temperature reaches 215, and cuts off at 205. Why?


The fan is controlled by water temp sensor to keep the temp between 160 (fan off) and 190 (on). Is the temp gauge going into the red? Is the temp sending unit for the gauge correct? The fan will run continuous with A/C on. Also check fan relay for over heating.

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Engine over heat all the time so easy


If the fan is running it may be a stuck closed thermostat. If the fan does not run it may be fan relay, fuse, temp sensor or fan itself. If you have 2 fans one is usually for cooling water temp and the other is when you turn on A/C. The one for the cooling water temp should come on and off to keep the water temp at a set temp point. If it over heats and the fan is working I would say the thermostat is probably the problem.

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SS w/3.8l engine. What would cause the first electric fan not run but when temp rises the second fan will come on?


The coolant fan should kick on when temp reaches 192 degrees. Have you changed your thermostat? The 2nd fan is for the a/c. If car is running hot, it's probably thermostat or cooling fan

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run fault codes to check for coolant temperature sensor that controls the fan operation and the fan relay . Check both fan fuses . Check that the fan spins freely. Temp range for the fan operation is around 80 degrees C turn on and runs until coolant temperature is well below this

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What makes the cooling fans turn on?


there is a temperature sensor that feeds the ecm(computer)a signal to let it know if the motor requires cooling operation at a predermined temp,which the ecm sends a signal to the cooling fan relay to turn on the cooling fans.when the temp lowers to a predetermined temp the signal is turned off to the ecm and the ecm turns off the signal to the fan relay to turn off the cooling fans.

Sep 18, 2011 | 2000 Pontiac Grand Am GT

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95 monte carlo 3.1 cooling fan comes on at 3/4 temp, when the coolant temp sensor is disconnected both fans run strongly until car is shut off, but when its connected only 1 fan will come on at 3/4 temp


to check both fans work at high temps put a sheet of card over the rad to block off airflow and run engine till hot,keeping an eye on when they both start (one is set at a lower temp than the other),if the second fan dont start when the engine is really hot THEN you have a problem.....

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Cooling fans on 1994 Caprice classic with 4.3 v8 not coming on. I have replaced the temp sensor on the water pump, temp sensor on the block, all relays, fuses are good, replaced the ecm (engine control...


On a vehicle this age, it is likely that the fans themselves have worn out. Test the fans by running battery power directly to the positive contact. If they start, they are OK. On 4.3 motors, there is also a seperate temp sensor to signal the fans, usually called a fan switch. I believe it operates independent of the ECM. Another possible culprit is a bad ground at the fans or even a loose or corroded negative battery cable.

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My 1998 buick regal non turbo 3800 radiator cooling fans will not work when the car gets to operating temp. The fan motors will work whtn the AC is on. I think it could be the temp sensor that turns on the...


the electric cooling fan for the radiator will not turn on when the engine reaches normal operating temp, its only supposed to come on if the engine temp goes over the normal temp. (around 220 degrees)
it is normal for the fan to come on any time the a/c or defroster is turned on.

Oct 12, 2009 | 1998 Buick Regal

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Radiator fan not turning on time


Check the rad fan fuse or the relay under the hood.
Is the temp going too high? Check and make sure you are not low on rad fluid (engine cool). An air pocket where the fan temp sensor on the rad is located will not activate the sensor.

Failing that, check the rad temp sensor which activates the fan. If this sensor does not close at high temp...the fan won't work.

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1 Answer

Cooling fan wont work


The water temp sensor is located near the thermostat housing. This sensor is what tells the ECM to turn the fan on/off. The water temp sending unit is located near the same area. You know you have the correct sensor is because the water temp sensor has a 2 prong plug. The water temp sending unit only has 1 prong.

Sep 26, 2008 | 1998 Chevrolet Cavalier

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