Radiator Fan Doesn't turn on. - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 12 (permalink) Old 11-09-2018, 10:21 PM Thread Starter
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Exclamation Radiator Fan Doesn't turn on.

Hello all,

Started with a new issue of slow overheating(Radiator fans doesn't turn on). And here are my points of work/observation/research.

Car: 2003 Mazda 6 V6, 56000 Miles only.

1. No check engine light.
2. Fan control module is good. (checked with new part)
3. Radiator fan doesn't turn on when AC is on.
4. Temp Gauge will be at a normal level until I get stuck in stranded traffic for a longer time. It will be normal as long as I keep rolling.
5. Coolant level is good.

This point will make sense now.
6. Checked power at FCM input terminal, There is no power. I see the ground is ok.

I guess there is no power coming from ecu. Correct me if I'm wrong.

Can someone please assist me with this issue.

Thanks in advance.
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post #2 of 12 (permalink) Old 11-09-2018, 11:26 PM
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Welcome to the forum have you checked the relays/ fuses for the fans? If you have I would try tracing the wiring it sounds like you might have a short or broken wire somewhere


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post #3 of 12 (permalink) Old 11-10-2018, 01:54 AM
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I'm not sure if the thermoswitch is responsible for sending the signal for the fan. If it is, then you might want to check it.
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post #4 of 12 (permalink) Old 11-10-2018, 09:02 AM Thread Starter
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Yes, I have checked all the fuses and relays. All are good. I've no idea of the thermoswitch, where can I locate it? and I also assume it might be the wiring issue. Wanted to check the output at the ECU, unsure of how to do it.

Thanks,
Goutham
2003 Mazda 6 V6
2012 BMW 328i 2.0T
2018 Toyota Camry 2.5
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post #5 of 12 (permalink) Old 11-10-2018, 10:40 AM
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Thermoswitch

Try to locate the wiring from the fan then trace it towards the engine block. Depending on the model, it may look like this:

I just want to clarify item number 2:

Quote:
Originally Posted by goutham_scorpio View Post

2. Fan control module is good. (checked with new part)


...
Do you mean to say that you tested the radiator fan itself and it's working properly?
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post #6 of 12 (permalink) Old 11-10-2018, 12:12 PM
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I know you said that the Temp gauge appears to be working correctly; but did you hokk up an OBD scanner to see what temperature the computer think's you're running at?
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post #7 of 12 (permalink) Old 11-10-2018, 12:12 PM Thread Starter
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Quote:
Originally Posted by Archerfish View Post
Do you mean to say that you tested the radiator fan itself and it's working properly?
There is no power coming from FCM to the radiator fan(Let me know if there is any way to bypass the FCM to turn on the fan), so as of now I cannot test fan and I believe radiator fan should be working fine.

And ill update you once I the trace the switch in this weekend.

Thanks,
Goutham
2003 Mazda 6 V6
2012 BMW 328i 2.0T
2018 Toyota Camry 2.5
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post #8 of 12 (permalink) Old 11-10-2018, 12:15 PM Thread Starter
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Quote:
Originally Posted by Mad Myche View Post
I know you said that the Temp gauge appears to be working correctly; but did you hokk up an OBD scanner to see what temperature the computer think's you're running at?
Nope, I didn't check this. I'll check this too.
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post #9 of 12 (permalink) Old 11-10-2018, 12:20 PM
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You can try to remove the wiring connections of the radiator fan, there should be a terminal. Then, you connect it directly to the battery. The fan should run if it's good. And yes, if you trace this you should be able to find the thermoswitch.

Of course, you need additional two wires to connect this directly to your battery.
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post #10 of 12 (permalink) Old 11-10-2018, 12:22 PM Thread Starter
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Sure i'll do this. thank you
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