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Twin Cooling Fan Question.

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Red Robbo
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PostPosted: Wed Aug 21, 2013 16:48    Post subject: Reply with quote

Hunter wrote:
Hey Ted what size (amps) relays you running them through ???


Standard 30A automotive relays......
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Hunter
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PostPosted: Wed Aug 21, 2013 17:04    Post subject: Reply with quote

Red Robbo wrote:
Hunter wrote:
Hey Ted what size (amps) relays you running them through ???


Standard 30A automotive relays......


Was at my local auto electrical man .

He gave me all the wire (heavy stuff for fans) .

But he told me that most cars will use 50 amp relays for fans ..

Said if I used standard relays they would just blow .....

Just a thought  Wink  Wink
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Red Robbo
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PostPosted: Wed Aug 21, 2013 18:22    Post subject: Reply with quote

Mmmm...yes I did have an issue with 30 amp fuses,but the relays so far have been fine.....I shall be carrying a couple of spares though  Wink
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Red Robbo
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PostPosted: Wed Aug 21, 2013 18:25    Post subject: Reply with quote

If in doubt and you can get hold of them,then fit 50A's...in fact if you do could you also grab a couple for me please and I'll square you up at the BB.... Smile
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PostPosted: Wed Aug 21, 2013 19:35    Post subject: Reply with quote

I got 2 out of an astra .... will be passing breakers again tomorrow

Will grab a pair for you . Wink
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Red Robbo
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PostPosted: Wed Aug 21, 2013 19:46    Post subject: Reply with quote

Hunter wrote:
I got 2 out of an astra .... will be passing breakers again tomorrow

Will grab a pair for you . Wink


Sound..... Cool
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crusader
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PostPosted: Wed Aug 21, 2013 20:25    Post subject: Reply with quote

Fuses are there to protect cables in event of overload.  If your running 50A  is your wiring up to it. Could end up melting cabling before fuse goes.  I run 40A relays with 30A fuses with a twin speed 16" kenlowe and a 12" cheapy for extra cooling on the high speed circuit.  I use the twin switch from X-Eng in the bottom hose. Never had any issues towing or otherwise.  Fans are very rarely on.
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PostPosted: Wed Aug 21, 2013 21:12    Post subject: Reply with quote

I'm using very heavy wire  .

Probably overkill if honest  Wink
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Red Robbo
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PostPosted: Wed Aug 21, 2013 21:20    Post subject: Reply with quote

crusader wrote:
Fuses are there to protect cables in event of overload.  If your running 50A  is your wiring up to it. Could end up melting cabling before fuse goes.  I run 40A relays with 30A fuses with a twin speed 16" kenlowe and a 12" cheapy for extra cooling on the high speed circuit.  I use the twin switch from X-Eng in the bottom hose. Never had any issues towing or otherwise.  Fans are very rarely on.


It seems that the Mondeo fans have a higher startup current than the Kenlowes.....hence  possibly my prob with 30A fuses...provided the proper gauge wiring is used......which I'm sure is the case with Hunter and myself ...then the initial  current is dependant on the agression of the fan on startup,once running the current draw may be relatively low.......eg 35A startup    15A running.......So running 50A gear is not a bad idea,if a short circuit occurs then the fuse will do its job........However  your point about correct  spec power AND  earth wiring for the fan motors post relay is totally valid and should be noted and considered by any carrying out this mod  Smile
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PostPosted: Wed Aug 21, 2013 21:32    Post subject: Reply with quote

Hunter wrote:
I'm using very heavy wire  .

Probably overkill if honest  Wink


Ditto...but make sure that the earth wiring for the fans is the same spec......I know......I'll shut up...... Embarassed
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Hunter
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PostPosted: Wed Aug 21, 2013 21:45    Post subject: Reply with quote

Thats what local auto electrical man told me . Start up on ford fans was heavy draw .

He supplied all wire , connections and fuses .

Went to breakers got 2 relays , showed them to auto man  . He said they were just the job .
He has 50 amp relays @£10 each . Not like he was trying to sell something I didn't need .

Going by his advice there is no fuse to the fan . Only fused on the switched side .
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PostPosted: Mon Aug 26, 2013 17:55    Post subject: Reply with quote

Update....When checking temp at stat with T2,lower range switch 83/78 higher range 88/87 ......this is not doing me any favours to progressively control the temp  Rolling Eyes
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PostPosted: Mon Sep 02, 2013 16:31    Post subject: Reply with quote

Sorted now Ted ??
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PostPosted: Mon Sep 02, 2013 16:41    Post subject: Reply with quote

Hunter wrote:
Sorted now Ted ??


HD realys fitted....Thanks Mate  Very Happy ........new thermo switches at work,no chance to fit yet....... Rolling Eyes
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Twister
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PostPosted: Mon May 12, 2014 21:27    Post subject: Reply with quote

Any update on this Ted ?

Reason I ask is that I want to get an X-eng sender, but I only want the Low temp circuit to run off it, with a manual switch for the high temp.
Just wondering if you've sussed what sender range works best for the LT.
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