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Old 01-22-2018, 05:41 PM   #1
cpy911
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Default Manual Fan cooling switch mod burned up today!

I wired up a switch to turn my radiator cooling fan on and off using the fuse box. I have been running like this for a year now. Today, something shorted and I got some nice smoke...scared me pretty good. What could have caused this? I don't know yet the extent of the damage...I hope the fuse box is ok...but the relay may now be bad?

I plan to wire it up again...but put a fuse in my circuit....my guess is wires got loose?
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Last edited by cpy911; 01-22-2018 at 05:54 PM..

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Old 01-22-2018, 06:55 PM   #2
Simon Rose
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Default Re: Manual Fan cooling switch mod burned up today!

Hard to say without knowing the circuit. Could you do a sloppy MS paint diagram or explain it? Hope it works out! I've though about doing this same mo before but the ECU seems to keep it in check okay.

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Old 01-22-2018, 11:33 PM   #3
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Default Re: Manual Fan cooling switch mod burned up today!

If you want to see if the relay has gone bad, either engage the air conditioning or unplug the engine coolant temperature sensor.

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Old 01-22-2018, 11:42 PM   #4
cpy911
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Default Re: Manual Fan cooling switch mod burned up today!

I showed one of my students (I'm a humble teacher) who is a car guy.
Said my wires were too thin and my switch was bad.
Going to wire up directly to the battery now and add in a relay and fuse.

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Old 01-23-2018, 12:37 AM   #5
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Default Re: Manual Fan cooling switch mod burned up today!

Wha....why...
If you're going to tap into the load side of the relay your entire new run HAS to be able to hold the 30+ amp load of the radiator fan. Looks like you failed to realize this and lucked out only burning up the wire and not the whole car.

Tap into the switching side of the relay and use a diode to keep the "on" signal from getting back to the PCM. All problems solved and you can use 20ga wire without issue.


Others have posted good luck with jumping the A/C high pressure switch, which turns the A/C button into a radiator fan on/off button (above 45f).

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Old 01-23-2018, 01:42 PM   #6
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Default Re: Manual Fan cooling switch mod burned up today!

What is this “diode” you speak of and where exactly should it be placed?

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Old 01-23-2018, 04:52 PM   #7
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Default Re: Manual Fan cooling switch mod burned up today!

Not my own words, but "In electronics, a diode is a two-terminal electronic component that conducts primarily in one direction (asymmetric conductance); it has low (ideally zero) resistance to the flow of current in one direction, and high (ideally infinite) resistance in the other".

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Old 01-23-2018, 04:56 PM   #8
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Default Re: Manual Fan cooling switch mod burned up today!

Not my own words, but "In electronics, a diode is a two-terminal electronic component that conducts primarily in one direction (asymmetric conductance); it has low (ideally zero) resistance to the flow of current in one direction, and high (ideally infinite) resistance in the other".

It provides a block and permits voltage from going back. Used also in Photovoltaic DV solar cells, to prevent stored electricity from 'bleeding back' when the sun goes down.

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Old 01-23-2018, 04:58 PM   #9
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Default Re: Manual Fan cooling switch mod burned up today!

Quote:
Originally Posted by bumpdraft View Post
What is this “diode” you speak of and where exactly should it be placed?
IN a DC circuit across the switch contacts, or if switching a coil or other inductive load across the load.

FYI "across" = in parallel with and reversed biased with power applied from the circuit source.

That UGJB that is now fried should be replaced and the ECTS circuit and/or fan circuit repaired so AUTO is running the fan. Best guess is the UHJB was already failed before the relay fried.

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Old 01-25-2018, 08:42 AM   #10
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Post Re: Manual Fan cooling switch mod burned up today!

Quote:
I showed one of my students (I'm a humble teacher) who is a car guy.
Said my wires were too thin and my switch was bad.
Yes, on the load side the wiring should be 10 gauge or even thicker and you would need a robust switch or secondary relay (30 amps capacity).

My DIY automatic/auxiliary fan controller is still working perfectly after all these years (I posted a full write up about it long ago).
I have had no problems whatsoever with it and never have to worry about the engine temperature.

There are other ways to accomplish the same goal though as fetchitfido said.

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