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Wiring in a pair of electric fans?

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Brad.Cogan Avatar
Brad.Cogan Bradley Cogan
RAF Cosford, Shropshire, UK   GBR
1977 Triumph Spitfire 1500 "Wray"
1989 Toyota MR2 "Red Mister Two"
2007 Fiat Grande Punto "Pepper"
Got a pair of electric fans for my 1500 to replace the mechanical fan. Only thing is I have no idea what I'm doing with the thermostat and wiring as I'm pretty clueless when it comes to wiring.

Would somebody be able to point me in the right direction please?



Brad Cogan

1977 Triumph Spitfire 1500 'Wray'
1989 Toyota MR2 Mk1b AW11 1600 twin cam
2007 Fiat Grande Punto Active 1.2 'Pepper'

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Doug in Vegas Avatar
Doug in Vegas Douglas D
Las Vegas, NV, USA   USA
Are you wanting them to come on in stages or together?

Easiest hookup is to pick up a universal fan control for about $15. They say to attach the thermocouple to the radiator but I prefer to slip it into the bottom hose, that way it monitors the work of the radiator.

Tap a brown wire for continuous operation or a white wire if you want it to switch off when you take out the key.

colodad Avatar
colodad Silver Member Calvin Williams
Grand Junction, CO, USA   USA
1979 Triumph Spitfire 1500 "Spitty"
Doug,
elaborate more on slip in into the bottom hose.

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Doug in Vegas Avatar
Doug in Vegas Douglas D
Las Vegas, NV, USA   USA
Here's what the fan control looks like:



It has a thermocouple on a thin metal tube. What you do is pull the bottom hose out of the radiator and slip this inside the hose under the hose and the clamp. It doesn't work well if you have an old hose that's become stiff. Even with a new hose you may need to add a pour-in type sealer.

People often put the thermocouple in the top hose and their fans run constantly because that's the hot side of the radiator. You want it to switch on only when needed so it should monitor the cool side of the radiator which is the bottom hose. When you are on the freeway the fan isn't needed as there is enough airflow moving forward without it.

On edit, forgot the "/".



Edited 1 time(s). Last edit at 2017-08-24 05:30 PM by Doug in Vegas.

colodad Avatar
colodad Silver Member Calvin Williams
Grand Junction, CO, USA   USA
1979 Triumph Spitfire 1500 "Spitty"
In reply to # 1480418 by Doug in Vegas Here's what the fan control looks like:


skyking1231 Avatar
skyking1231 Silver Member Frank Strobel
Mt. Sinai, NY, USA   USA
1975 Triumph Spitfire 1500 "Lil' Rose"
i wired on two fans as pushers . (Wax gonna post a picture...but it is not on my phone). Anyway I have a relay that gets switched on with a thermostat. My thermostat is located near the engine thermostat. You want power to the fans from the battery with an online fuse . The relay will get power from the ign circuit (white wire).

Mine come on together....was thinking of have them come on in stages.

I did get a little fancy....I have an led that comes on when the relay is powered in the dash .

Yellowhawk Valley Avatar
walla walla, WA, USA   USA
1969 Triumph Spitfire "Walla Walla"
1969 Triumph Spitfire "Portland"
1972 Triumph Spitfire MkIV "Spokane"
1975 Triumph Spitfire 1500 "Dayton"    & more
Bradley, I think to make an accurate recommendation it would be good to know just what fans you have and what pieces came with it, and from where. Maybe some photos. Otherwise we are really guessing as to what it is you need and how you should install them.


And as I often do, I will also throw out my anti-change to electric fan comment. My opinion is that if your stock fan is no longer cooling water sufficiently, then you have other issues that need repaired first. Putting on a herd of electric fans is not necessarily going to make it cooler. You may have radiator issues, water passage blockage, water pump issue, hoses and pipes plugged, etc.

Of course there are those that just want to do cool things to be cool and don't really do them to make things cooler. If you do it for personal preference or for "just because" then go do it, it is your car.
Good luck with it, whatever you do.
Dan

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Brad.Cogan Avatar
Brad.Cogan Bradley Cogan
RAF Cosford, Shropshire, UK   GBR
1977 Triumph Spitfire 1500 "Wray"
1989 Toyota MR2 "Red Mister Two"
2007 Fiat Grande Punto "Pepper"
Hey, I've just done a lot of engine work and replaced my old rusty rad with a new aluminium one which came with a pair of electric fans that I have stuck onto the rear of the rad as puller fans. I'm not sure how/where to put the line from the battery to the thermostat controller.



Brad Cogan

1977 Triumph Spitfire 1500 'Wray'
1989 Toyota MR2 Mk1b AW11 1600 twin cam
2007 Fiat Grande Punto Active 1.2 'Pepper'

Brad.Cogan Avatar
Brad.Cogan Bradley Cogan
RAF Cosford, Shropshire, UK   GBR
1977 Triumph Spitfire 1500 "Wray"
1989 Toyota MR2 "Red Mister Two"
2007 Fiat Grande Punto "Pepper"
I tried driving it around the block a few times to test the engine work I've done but after about 5 minutes it got past the 3/4 line on the gauge so I gave up.



Brad Cogan

1977 Triumph Spitfire 1500 'Wray'
1989 Toyota MR2 Mk1b AW11 1600 twin cam
2007 Fiat Grande Punto Active 1.2 'Pepper'

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Doug in Vegas Avatar
Doug in Vegas Douglas D
Las Vegas, NV, USA   USA
Were the fans kicking on?

Doug in Vegas Avatar
Doug in Vegas Douglas D
Las Vegas, NV, USA   USA
In reply to # 1481181 by Brad.Cogan thermostat controller.

Is there a probe on the controller?

clshore Carter Shore
Beverly Hills, FL, USA   USA
The fan is only needed to ensure airflow through the radiator when the car is going less than about 10-15 MPH.
That said, it's important to ensure that the fan airflow is from front to back.

ExPatBrit Avatar
ExPatBrit Mike W
Redmond, WA, USA   USA
For peace of mind I have a manual switch override as a backup if the thermo switch isn't working. Mine occasionally seems to lag a little sometimes, it eventually comes on.

Brad.Cogan Avatar
Brad.Cogan Bradley Cogan
RAF Cosford, Shropshire, UK   GBR
1977 Triumph Spitfire 1500 "Wray"
1989 Toyota MR2 "Red Mister Two"
2007 Fiat Grande Punto "Pepper"
In reply to # 1481186 by Doug in Vegas Were the fans kicking on?

I've only just installed the fans to replace the mechanical fan. I haven't wired them up yet.



Brad Cogan

1977 Triumph Spitfire 1500 'Wray'
1989 Toyota MR2 Mk1b AW11 1600 twin cam
2007 Fiat Grande Punto Active 1.2 'Pepper'

FrankD Avatar
FrankD Frank D
Doylestown, PA, USA   USA
Brad,

Pretty far off topic but...
Your tires are sharp. How about some pictures/size info on them?

Thx
Frank

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