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Electric fan not kicking on - Cars & Trucks

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Could be any of these:
bad fan
blown fan fuse
bad temperature sensor
bad fan relay

or the wiring to the fan.

Posted on Apr 13, 2015

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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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The electric fan should kick in before overheat. If it's not, then check:
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You're talking about the electric fan on the radiator?

An electric fan only kicks in when there is excess heat in the engine cooling system.

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check for a bad cts or a fuse for the fans in fuse box. also check operation of fan. at fan connector, run a wire from battery positive to positive on fan.if you need a ground. just run a wire from negative post to negative on fan. if they turn on you will know its not the fans. also make sure coolant is not low.

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Ac only gets cool when car is moving

Walk around front and make sure the electric fan kicks on when you turn on the air conditioning.
If the electric fan is not kicking on, the most common failure point is the relay. I have never worked on a fan on an e46, but a quick scan of the forums indicates that on this car, there is no relay but there is some sort of control box attached to the fan that turns on the fan based on a signal from the DME.
The complete fan with control box is very expensive, but one fellow reported fixing his electric fan problem with a new fan motor that he got on eBay.

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First if it is electric fan or Viscous Fan. If the electric, check if fuses are ok, connections fine, and if the motor works. If it is the Viscous Fan, there is not much you can do unless you want it to work permanently. Normally the fan will be moving slowly once the engine starts, than when the inner thermostat gets its temperature it kicks in a fan clutch and than the rotor starts spinning as fast as the engine, it is less effective than electric fans as it will only give you the rpm speed of the engine from 1000rpm to 5000rpm where the electric motors give up to 8000rpm.On the Viscous Fan check if it kicks in if not replace it or get someone who knows what he is doing to permanently lock it so it will turn even when engine is cold. Not recommended in normal climate.

Jun 02, 2010 | 1997 Mercedes-Benz E-Class

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Temp fan failure could be the thermo temperature sensor. I am not sure of the actual name of it but if you can direct wire your fan and it works, then the fan is good, the sensor is bad. I myself have rewired a switch to them so I can control when and how long the electric fan runs.

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electric fans or belt driven? if electric are they kicking on?

Feb 22, 2010 | 2003 Jeep Grand Cherokee

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Electrical fans wont kick on, car will run hot if they dont kick in..Tried changing fuses still wont come on..

The fans have a seperate temperature sensor either in the radiator or the block. Follow the fan wires to locate this sensor and unplug the sensor and with the key on touch the wires together. If the sending unit is bad the fans will come on. If the sending unit works the fan motor is bad.

Jan 19, 2010 | 1995 Chevrolet Impala

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