Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now

Now available from EcoModder: ScanGauge II fuel economy gauge.  Click for details.  

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 11-26-2012, 09:14 AM   #1 (permalink)
EcoModding Apprentice
 
Join Date: May 2012
Location: Indiana, US
Posts: 132

TheCav - '04 Chevy Cavalier LS
Thanks: 13
Thanked 21 Times in 17 Posts
Thinking about cooling fan indicator light. Need help.

I have never done anything related to electronics, but this LED will put my mind at ease for when I install my grill block.

So what I need is help... I am quite savy at figuring things out but I've never worked with electronics before so... yeah.

What I want is a little LED on my dash to turn on when my cooling fan kicks on.

Questions so far:
I have a scanguage, do I even need a fan LED?
What temps should I be watching on my scanguage? (2 different temps)
What tools will I need?
Would any soldering be needed?
What guage wire and what size LED?

Not sure how to go about figuring out what I need. Much thanks to those with input.

  Reply With Quote
Old 11-26-2012, 10:50 AM   #2 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 16,728

Blackfly - '98 Geo Metro
Team Metro
90 day: 73.54 mpg (US)

ForkenSwift - '92 Geo Metro EV
Last 3: 95.68 mpg (US)

U.F.O. - retired - '00 Honda Insight
Team Honda
90 day: 88.21 mpg (US)
Thanks: 1,038
Thanked 2,829 Times in 1,506 Posts
Quick search shows a number of people here have done this. Have you searched/read any of these?

Easy way to tell when fan is running while driving

Fan indicator questions

Run a light from the fan?

EDIT: added....

Quote:
I have a scanguage, do I even need a fan LED?
The SG doesn't show how often the fan is coming on. It will only show your current and max. temps (FWT -- Farenheit Water Temp is the gauge label).

So it can only tell you whether or not it came on at least one time - if you know the preset temp at which your fan will kick on, and your Max FWT exceeded that on the current trip.
__________________
Latest mods test: 15 mods = 15% MPG improvement: A-B test, 2007 Honda Civic 1.8L, 5-speed
Ecodriving test:
Manual vs. automatic transmission MPG showdown: Nissan Micra 1.6L



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote
The Following 2 Users Say Thank You to MetroMPG For This Useful Post:
mcrews (12-04-2012), YeahPete (11-26-2012)
Old 11-26-2012, 11:05 AM   #3 (permalink)
Super Lurker!
 
Slow_s10's Avatar
 
Join Date: Sep 2012
Location: Chesapeake, VA
Posts: 88

Rusty - '88 Chevrolet S10 base
90 day: 23.72 mpg (US)

Doc - '08 Honda Civic EX-L
90 day: 29.6 mpg (US)
Thanks: 4
Thanked 14 Times in 11 Posts
I can't answer your Scangauge questions but If I were doing a project like this personally I would be soldering and heat shrinking everything. However there are definitely other ways to get it done. In any case the easiest way would be to get an Led that is already prewired and setup for automotive voltage. You can get these prewired LEDs fairly cheap. For example I did a quick search on Amazon and you can get a 10pk of prewired leds for automotive use for like $6 (Qty 10- LED Lights- 3mm pre wired 12 volt leds- 12V Red : Amazon.com : Automotive). Then all you would need to do is use some fairly small gauge wire 18~22 and either run both positive and negative from the LED or just the positive to the E-fan. Then just splice the wires from the LED right into the efan wires. Positive to positive negative to negative, or if you only ran a positive wire to the fan, then just ground the LED negative wire somewhere under the dash. This is usually where I would solder in the wire from the LED but you can also just use something like a 3M T-Tap, which can just be crimped onto the Stock E-Fan wire and then you can use a normal spade connector to connect the LED wire.

The hardest part of the whole thing will probably just be getting the wires from the engine compartment to the interior of the car cleanly. I can't speak for your paticular car but usually the easiset way is to use an existing gromet and just go through there. but if it becomes necessary to make your own hole for the wires make sure you get a small rubber grommet to protect the wires.
__________________
-Kevin
  Reply With Quote
The Following User Says Thank You to Slow_s10 For This Useful Post:
YeahPete (11-26-2012)
Old 11-26-2012, 01:32 PM   #4 (permalink)
#1 e85 phev hybrid owner!
 
Join Date: May 2012
Location: Central, VA
Posts: 2,225

Honda - '10 Honda Insight ex

Kick - '95 Suzuki Sidekick ljx
Thanks: 1,218
Thanked 200 Times in 167 Posts
I can tell by my sg2 when I see a sudden 20 degree drop from the temp the fan is suppose to come on.

On another car I used a prewired 12 volt led from an online store. I loosely hooked it in parallel using its leads to the original connector and ran it up to the edge of the hood and windshield wipers so I can see it from the drivers seat.
  Reply With Quote
The Following 2 Users Say Thank You to Cobb For This Useful Post:
mcrews (12-04-2012), YeahPete (11-26-2012)
Old 11-26-2012, 01:37 PM   #5 (permalink)
Super Lurker!
 
Slow_s10's Avatar
 
Join Date: Sep 2012
Location: Chesapeake, VA
Posts: 88

Rusty - '88 Chevrolet S10 base
90 day: 23.72 mpg (US)

Doc - '08 Honda Civic EX-L
90 day: 29.6 mpg (US)
Thanks: 4
Thanked 14 Times in 11 Posts
That definitely works too, and it simplifies the issue of having to run wires through the firewall.
__________________
-Kevin
  Reply With Quote
Old 11-26-2012, 03:30 PM   #6 (permalink)
EcoModding Apprentice
 
Join Date: May 2012
Location: Indiana, US
Posts: 132

TheCav - '04 Chevy Cavalier LS
Thanks: 13
Thanked 21 Times in 17 Posts
Thanks for all the info so far.
I'll be looking into the matter. I need to acquire a few tools as well.
  Reply With Quote
Old 12-04-2012, 12:06 PM   #7 (permalink)
EcoModding Apprentice
 
Join Date: May 2012
Location: Indiana, US
Posts: 132

TheCav - '04 Chevy Cavalier LS
Thanks: 13
Thanked 21 Times in 17 Posts
Welp, I looked into it a bit more. I have only 1 fan. I think it is always on. I will verify this next time I start my car.
  Reply With Quote
Old 12-04-2012, 12:07 PM   #8 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 7,865

CM400E - '81 Honda CM400E
90 day: 58.77 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 52.46 mpg (US)

Sunfire - '97 Pontiac Sunfire
Team Pontiac
90 day: 32.95 mpg (US)

Metro - '99 Chevrolet Metro
Thanks: 490
Thanked 1,002 Times in 657 Posts
It should not be running continuously.
__________________
Current project: 2002 Honda Civic LX repair & modding
Currently driving: 1997 Sunfire 4 spd auto build thread
  Reply With Quote
Old 12-04-2012, 12:13 PM   #9 (permalink)
...beats walking...
 
Old Tele man's Avatar
 
Join Date: Jul 2009
Location: Tucson, AZ
Posts: 5,119

'04 Vibe - '04 Pontiac Vibe Base (1ZZ-FE)
90 day: 29.19 mpg (US)

'14 Prius - '14 Toyota Prius Four (2XR-FXE)
90 day: 46.43 mpg (US)
Thanks: 97
Thanked 835 Times in 625 Posts
Just a "Wild Donkey Guess" but sometimes one fan terminal (HIGH-side) is wired directly to +12VDC and the other terminal (LOW or GND-side) goes to the "switching-to-ground" circuitry, either a grounding thermal switch or electronic-control from the engine ECU/ECM that provides the electrical path to ground. Hence, if he has connected to the "high-side" terminal, it would appear that the fan is ON all the time.
__________________
2014 Toyota Prius 1.8L eCVT < new >
2009 Pontiac Vibe 1.8L/SFI 4A
2004 Pontiac Vibe 1.8L/MFI 4A

2011 Chevrolet LTZ Cruze 1.4LT 6A < old >
1971 Dodge Charger 318 3A
1970 Plymouth AAR 'Cuda 340/6BBL 4M
1968 Dodge Charger 383 3A
1967 Plymouth Barracuda Formula S 383 4M
1965 Plymouth Barracuda Formula S 273 4M
  Reply With Quote
The Following User Says Thank You to Old Tele man For This Useful Post:
mcrews (12-04-2012)
Old 12-05-2012, 07:50 AM   #10 (permalink)
EcoModding Apprentice
 
Join Date: May 2012
Location: Indiana, US
Posts: 132

TheCav - '04 Chevy Cavalier LS
Thanks: 13
Thanked 21 Times in 17 Posts
OK. I Checked the fan yesterday. It is not always on. I also kept an eye on the water temp via scanguage. Warmed up to 190 F on acceleration. When coasting temp went down to 186 F.

  Reply With Quote
Reply  Post New Thread

Tags
cooling fan light, engine temperature, led

Thread Tools





Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com