1998 Dodge Neon Logo
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Anonymous Posted on May 18, 2016
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What would make the fans not come on and cool the radiator?

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  • perrynbecky1
    perrynbecky1 May 18, 2016

    There are several reasons an electric fan will not come on. Here is a list of checks to do in order to diagnose the problem but you will need a good test light, and or a digital volt ohm meter, you will need to locate the fuse panel either through a shop manual, or your owner's manual, or you can go looking around either under the driver's side of the dash, passenger kick panel, or most commonly found under the hood, but occasionally fuse panels are even placed behind a hidden compartment behind an access panel in the glove box.

    Once you have these things and the fuse box located, test the appropriate fuse by touching the back of the fuse to see if both metal tabs on the back light up. If only one side does, the fuse is blown. If both sides don't light up, then you have a power supply wire that is open or in some cases, corroded and unable to conduct electricity.

    If the fuse tests good, then you will need to trace the circuit to the fan relay (You will need to have a wiring diagram for this job). You will then need to test the relay to make sure that the relay has a battery feed, ignition feed, and that the ground wire coming from the PCM is not broken.

    Finally the output wire from the relay which is usually much larger than the other wires to handle the amperage, must have voltage coming out of it to the fan(s) when the relay is activated. You will want to check the plug at the fan for voltage and ground. If all these circuits test ok, then you need to replace the fan motor.

  • perrynbecky1
    perrynbecky1 May 18, 2016

    Note, there is a small fan module on Chrysler products that is located on the right side of the radiator support that is notorious for blowing out. Please add this to the equation by verifying power is going to the module. If it appears burn at the plug, replace it and the plug end, and retest the system.

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jackdo2

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  • Posted on May 18, 2016
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Hello Anonymous,

Before replacing the fan motor try hot wiring it to see if the motor will run. Disconnect the two wire connector at the fan motor and run two jumper wires from the battery. If you get the polarity backwards the fan will still run, just backwards... but it will answer the question of whether or not the motor is bad. If the motor runs on the hot wire setup, it's good and the problem lies somewhere else like the radiator fan relay.

This relay is located near the driver's side front wheel well. Go under the car and find the wires leading to the radiator fan on the drivers side. Trace them back and you will see they go to a waffer shaped solid state relay bolted to the car near the wheel well. It measures about 1 1/2 inches across and is about 1/4 inch thick.

Severe corrosion or heat damage to the aluminum mounting bracket may be the culprit. .

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