Question about 1993 Mazda MX-3

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Auxillary radiator fan will not shut off

The drivers side auxillary radiator fan continues to run even after ignition switch is off. I pulled the fuse,but what do you think might be the problem?

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  • ben_finn Dec 22, 2008

    Thanks for the response. It was the relay ,I replaced and all is OK.

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  • Mazda Master
  • 21,949 Answers

The fan is controlled by the A/C as well as engine,so it could be a switch on the A/C its in the pipe somewhere and when the pressure builds up it turns the fan on ....or a sensor on the cylinder head thats packed up or just a rely arced across and melted contacts together.

Posted on Dec 22, 2008

  • Colin Stickland
    Colin Stickland Dec 22, 2008

    wow a thanks ?? the first in 800+ postings ,i wont nag er indoors for a week now when she moans iam on here

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the sensor is giving a message that it is hot check radiator flow .

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Some cars are designed to allow the fans to run even with the key off until the engine and radiator cool down. If it continues to run after 19-15 minutes you may have a sticking fan relay, usually located in the fuse box in the engine compartment, just replace it and it should take care of your problem

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Radiator fan does not turn to


The thermo switch is fitted into the radiator low down on the left side (when sitting in drivers seat). It should have 2 thick wires going to it. If these are pulled off and joined together the fan should run continuously, even with the ignition switched off. It is reasonably easy to change if you have the correct size ring spanner. Dont forget to refill the radiator with antifreez when you have finnished. the part is readily available from most after market parts suppliers

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Cannot get A/C fan to shut off. It continues to run even when ignition switch is in the off position. I have to pull the fuse to get it to shut off.


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Cooling fan didnt shut off when ignition was turned off


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Location of the Auxiliary fan switch


The auxillary fan is used for AC cooling purposes, and your vehicle under normal circumstances should not overheat regardless of the status of the auxillary fan.

That being said, the auxillary fan is controlled by the PCM based on AC switch position via a fan control relay in your fuse box under the hood. There is no fan switch for it, as it is turned on based on PCM observance of AC control switch position.



Some things to look at regarding your overheat condition:

When the vehicle begins overheating, what are the conditions of the radiator hoses? Are both firm, or only one and the other soft? Are both hot, or is one hot and the other only warm?

Both a failed waterpump and a failed shut thermostat will show a hot hose on one side and only a warm hose on the other side of the radiator.

A failed (stuck shut) thermostat will also result in one very firm hose (highly pressurized and nowhere to go with the thermostat shut) and one relatively soft hose.

You can take the radiator cap off (BEFORE it pressurizes) and watch the water level as the car runs. If the thermostat is opening and waterpump is pumping, you will see fluid flow once it gets to operating temperature.

Watch your engine fan and see if it is engaged or just spinning freely. When warm and the engine shut off, the fan clutch should be engaged making the fan more resistant to turn. If it spins freely, the clutch is failing.

Check the area around the radiator and between it and the condenser for obstructions to airflow.

Obviously check the condition of the coolant for heavy scale/sludge. The 3.0/3.5 engines are notorious for turning coolant into thick rusty puddy.

Hope this helps!

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Auxillary fan will not shut off, continues to run when the car is not on. I have to unplug the switch before it will stop.


Is this the radiator fan you're talking about? If so it's supposed to run after the engine is switched off unitl it cools down. More noticeable on hot days.

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Check the fan relays. At the engine compartment. One may be stuck and keeping the fan running.Tap it a little bit before removing it. If it turns of , replace the relays.

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