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 cooling fan motor 
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Joined: December 20 2009, 1:58 PM
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Post Re: cooling fan motor
I checked the cooling fan fuse and replaced with a new one and the mechanic that replaced the fan checked the relay's. The mechanic did put a 12v power supply to the fan and it turned on.


June 04 2012, 1:17 PM
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Post Re: cooling fan motor
The primary cooling fan should come on when engine gets warmed up. The A/C fan when A/C is on.
If the fuse is good, and relay is good, and your fan is new and has tested fine, I'd suspect wiring. Possibly a glitch in the ecu, but I'd check wiring first, check for corrosion at connectors and for any broken wires.

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June 04 2012, 6:47 PM
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Is there a wiring diagram or a good picture showing the wiring from the harness to wherever it goes? How hard is it to trace the wiring? How hard is it to replace the wiring?


June 04 2012, 9:26 PM
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Did you try the diagnostic mode throttle bump?

I know when I had my 1.6, the first time the fan came on is when I did that. There was a HUGE cloud of dust. the 1.6 just doesn't get very hot.

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June 05 2012, 12:59 AM
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I will try that and keep ya posted. Thanks!!!


June 05 2012, 6:57 AM
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If the throttle bump doesn't turn it on and you know it works that tells you there is an issue with communication from the ECU.

If it was a swapped engine I would say that you have the wrong configuration of temp sensors in the coolant neck. Are sure the engine has not been played with in the past?

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June 05 2012, 11:07 AM
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Post Re: cooling fan motor
Yes. I have all the original invoices from the original owner for all the work on the car. I will look thru the paperwork again to make sure there was not an engine swap. Thanks.


June 05 2012, 7:53 PM
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Post Re: cooling fan motor
When you replaced the fuse, was the old fuse blown?
If it was, how is the new one now, still good or blown?

I just confirmed the DOHC 1.6 in 94 and newer has no sensors on the coolant neck (went outside to check the engine I pulled a while back). The green Thermosensor is near it, but not on it.
I don't know about the 92-93 SOHC 1.6, would have to hunt through some manuals. Been way too long since I messed with that engine, and I don't have it anymore.
What year is your mx3?

Unplugging the thermosensor, since default should turn on the fan, would be easier and faster than jumping TEN and Ground and doing the throttle bump.
Either way you try, recheck the fuse.

I checked online manuals for a good pic of wiring, but couldn't find one that really shows the wiring as it is in the car. Basic tracing of the wiring would be a visual inspection of the wires and where they go. May not be able see all of it, due to them going into the harness with other wires, but wouldn't hurt to take a look at what you can see for anything obvious.

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June 05 2012, 10:51 PM
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Post Re: cooling fan motor
Yeah I have a bad habit of assuming everyone is driving a V6. Disregard my engine swap comments.

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June 05 2012, 11:46 PM
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