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Thermo Fans 

 

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 Post subject: Re: Thermo Fans
Posted: Thu Aug 18, 2011 11:30 pm 
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muzza wrote:
Only did it for the EL fans....the unit will not plug into EF fans.
The unit has one 4 pin connector to suit EL fans only.
The EF fans have one 2 pin and one 3 pin connector.

It was very hard getting those connectors as the supplier had a minimum order quantity of five hundred units.
I did manage to sweet talk the supplier into supplying me a small quantity, but they would only do that for one type.....so I decided on the EL 4pin connector.
BTW, I did find it gratifying that the skills honed in my youth (sweet talking young ladies) were not totally lost after decades of lack of use :)

It would be easy to make a EF fans to EL control adapter cable, but, I cannot get the connectors.


you need the plugs that go onto the wiring loom? because i reckon i have a spare wiring loom laying around that i could cut them off?
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 Post subject: Re: Thermo Fans
Posted: Thu Aug 18, 2011 11:39 pm 
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Yep, that would work.
Could do a version, for you, with all three plugs so could work on either EF or EL fans.
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 Post subject: Re: Thermo Fans
Posted: Thu Aug 18, 2011 11:41 pm 
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muzza wrote:
Yep, that would work.
Could do a version, for you, with all three plugs so could work on either EF or EL fans.


so this meaning i wont need my relays or mechanical switch that i bought? also how much would it cost for that mate?

Cheers,
Brandon
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 Post subject: Re: Thermo Fans
Posted: Fri Aug 19, 2011 12:10 am 
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What'd you actually do there Murray?

Splice into the factory resistive sender that feeds to the computer? Or you've used your own?

And hence some kind of circuit to work out what resistance decides which speed?

And an AC feed in too?

Cheers,
Tim

 

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 Post subject: Re: Thermo Fans
Posted: Fri Aug 19, 2011 1:43 am 
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The first version I made used a dual temp switch which turned the fans on at half or full speed as well as to half speed when the aircon was used. Used four relays and some diodes.
Had that in for years.

I then had a request from several guys for the thermo fan setup.
Decided that the setup I had used was to difficult as the thermo housing needed to be removed to install an adapter (3/8 NPT to 14mm) for the dual thermo switch. The dual thermo switch price had gone up as well.
One of the vehicles was a Fairmont with climate so the method was not able to be implemented anyway.

So I designed a new version.
The controller I made is microprocessor controlled.
Reads the voltage on the sender to determine when to turn the fans on/off or at half speed or at full speed.
Also takes an input from the A/C clutch to run the fans when the A/C is on.
There is a circuit board in the grey case that has the microcontroller, interface circuits as well as the relays to control the fans.
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