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What is wrong if the cooling fan comes on when the coolant sensor is unplugged but when it is plugged in the fan and AC will not work?


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Wiki User
2004-10-30 15:38:01
2004-10-30 15:38:01

I have seen this before more than likely your coolant sensor has a internal short and needs to be replaced.

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Is the car overheating? As a safety measure, the fan will come on when the coolant sensor is unplugged. This is in case the wires come unplugged or the sensor goes bad so that the car will not overheat. If you have A/C the fan should come on within a few seconds after turning the A/C on. The fan on the car does not come on simply because it is plugged in to the sensor. It first has to get fairly hot....something like 238 degrees before the fan will come on. This is a how a correctly functioning fan will work. If it is not coming on when the gauge reads above that you may have to take it in to find out why. It could be a bad sensor....likely......or that the computer is not reading the signal correctly and thinks the car is running cooler than it is.


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